{"product_id":"amethyst-with-scalenohedral-dogtooth-calcite-inclusions-geode-sculpture","title":"Amethyst Geode with Scalenohedral \"Dogtooth\" Calcite inclusions","description":"\u003ch2\u003eAmethyst Geode with Scalenohedral “Dogtooth” Calcite Inclusions — Polished Edge Sculpture | Brazil | 861g\u003c\/h2\u003e\n\u003cp\u003eA standard amethyst geode is already a geological marvel. This specimen is something rarer: an amethyst geode in which a second mineral — \u003cstrong\u003escalenohedral “Dogtooth” Calcite\u003c\/strong\u003e — has grown directly within the crystal cavity, its sharp, elongated white or orange crystal points rising among and contrasting against the deep purple amethyst. The result is a \u003cstrong\u003etwo-mineral geological sculpture\u003c\/strong\u003e of extraordinary visual complexity: the rich violet of the amethyst, the bright geometric precision of the calcite, and the polished outer edge that frames the entire composition like a gallery mount. From \u003cstrong\u003eBrazil\u003c\/strong\u003e — the world’s premier amethyst source — and entirely one of a kind.\u003c\/p\u003e\n\n\u003ch3\u003ePhysical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 6.25\" × 4.5\" × 3\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 861 grams (approximately 1.9 lbs)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eForm:\u003c\/strong\u003e Amethyst geode with internal scalenohedral calcite crystal inclusions; polished outer edges\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinerals present:\u003c\/strong\u003e Amethyst (purple quartz) + Scalenohedral Calcite (“Dogtooth” habit)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalcite color:\u003c\/strong\u003e White to orange (iron-stained)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Polished exterior edges; natural raw crystal interior\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Brazil\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e 8364\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne of a kind\u003c\/strong\u003e — the specific arrangement of calcite within the amethyst cavity is unrepeatable\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eMineralogy — Two Minerals, One Extraordinary Cavity\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eAmethyst — The Purple Quartz Host\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAmethyst is the purple variety of \u003cstrong\u003emacrocrystalline quartz (SiO₂)\u003c\/strong\u003e, crystallizing in the trigonal system. Its color is produced by \u003cstrong\u003eiron (Fe⁴⁺) impurities\u003c\/strong\u003e within the silicon dioxide lattice combined with \u003cstrong\u003enatural irradiation\u003c\/strong\u003e from surrounding radioactive minerals. It forms in the vesicles (gas bubbles) of \u003cstrong\u003evolcanic basalt flows\u003c\/strong\u003e within Brazil’s \u003cstrong\u003eParaná volcanic province\u003c\/strong\u003e — one of the largest flood basalt formations on Earth — through a multi-stage process of silica infiltration, chalcedony lining, and inward amethyst crystal growth over millions of years. Mohs hardness: 7.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eScalenohedral “Dogtooth” Calcite — The Intruder Crystal\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCalcite\u003c\/strong\u003e (CaCO₃ — calcium carbonate) is one of the most abundant and polymorphic minerals on Earth, crystallizing in the trigonal system and occurring in an extraordinary range of crystal habits. The \u003cstrong\u003escalenohedral habit\u003c\/strong\u003e — the form responsible for the “Dogtooth” name — produces \u003cstrong\u003eelongated, steeply pointed crystals with curved, triangular faces\u003c\/strong\u003e that taper to a sharp apex, resembling the canine teeth of a dog or the fangs of a predator. The scalenohedron is a 12-faced form (ditrigonal scalenohedron) unique to the trigonal crystal system, and scalenohedral calcite is one of the most geometrically striking crystal habits in mineralogy.\u003c\/p\u003e\n\u003cp\u003eThe color of the calcite crystals in this specimen ranges from \u003cstrong\u003ewhite (pure CaCO₃)\u003c\/strong\u003e to \u003cstrong\u003eorange\u003c\/strong\u003e, with the orange coloration caused by \u003cstrong\u003eiron oxide (hematite or goethite) staining\u003c\/strong\u003e of the crystal surfaces or inclusions within the calcite lattice — the same iron chemistry responsible for the red-orange colors of jasper and carnelian.\u003c\/p\u003e\n\u003cp\u003eCalcite has a Mohs hardness of \u003cstrong\u003e3\u003c\/strong\u003e — significantly softer than the surrounding amethyst (Mohs 7) — and perfect rhombohedral cleavage in three directions. This hardness contrast is part of what makes the sharp, intact dogtooth points within this geode so remarkable: the calcite crystals have survived the geological processes and handling that would have destroyed less well-protected specimens.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow Did Calcite Grow Inside an Amethyst Geode?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe co-occurrence of scalenohedral calcite within an amethyst geode records a \u003cstrong\u003emulti-phase hydrothermal history\u003c\/strong\u003e of the cavity:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eBasalt vesicle formation\u003c\/strong\u003e — a gas bubble in cooling lava creates the initial hollow cavity\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSilica infiltration \u0026amp; chalcedony lining\u003c\/strong\u003e — silica-rich groundwater deposits a protective agate\/chalcedony shell on the cavity walls\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmethyst crystal growth\u003c\/strong\u003e — iron-bearing hydrothermal fluids under irradiation conditions cause purple amethyst to grow inward from the chalcedony lining\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluid chemistry shift\u003c\/strong\u003e — in a later phase, the hydrothermal fluid chemistry changes: calcium carbonate-rich fluids enter the cavity, either through fractures in the surrounding rock or changes in the groundwater chemistry\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalcite nucleation \u0026amp; growth\u003c\/strong\u003e — scalenohedral calcite crystals nucleate on the existing amethyst crystal surfaces and grow upward and outward, their sharp points rising among the amethyst terminations\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eThis two-phase mineral sequence — amethyst first, calcite second — is the geological record of two distinct episodes of hydrothermal fluid activity within the same cavity. It is this sequential complexity that makes amethyst-with-dogtooth-calcite specimens significantly rarer than standard amethyst geodes, and actively sought by mineralogists and serious collectors.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe Polished Edge — A Window into Geological Time\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe polished outer edges of this sculpture reveal the \u003cstrong\u003elayered agate and chalcedony banding\u003c\/strong\u003e that formed the geode’s protective outer shell — the earliest stage of the cavity’s mineral history, now visible as concentric color bands in cross-section. Each band represents a distinct episode of silica deposition, making the polished edge a literal timeline of the geological events that produced this specimen.\u003c\/p\u003e\n\n\u003ch3\u003eAs a Sculpture — Display \u0026amp; Aesthetic\u003c\/h3\u003e\n\u003cp\u003eThe visual drama of this piece is exceptional even among two-mineral geodes. The \u003cstrong\u003edeep violet amethyst\u003c\/strong\u003e provides a rich, saturated color field; the \u003cstrong\u003esharp white-to-orange calcite points\u003c\/strong\u003e rise from it with geometric precision, their bright color and angular form creating maximum contrast against the rounded amethyst terminations. The polished exterior frames the composition with gallery-quality refinement. At 6.25 × 4.5 inches and 1.9 lbs, it is substantial enough to anchor a shelf, mantle, or desk as a standalone sculptural object.\u003c\/p\u003e\n\u003cp\u003eIdeal display settings include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCollector’s display or mineral cabinet\u003c\/strong\u003e — a two-mineral specimen of genuine geological rarity; the dogtooth calcite habit alone makes this a noteworthy piece in any serious collection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLiving room, study, or office\u003c\/strong\u003e — a natural sculpture of extraordinary visual complexity that rewards close examination and invites conversation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeditation or sacred space\u003c\/strong\u003e — the two-mineral energy profile creates a uniquely complete energetic environment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGallery or boutique\u003c\/strong\u003e — museum-caliber quality at a private collector scale\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eMetaphysical Properties — Amethyst + Dogtooth Calcite Synergy\u003c\/h3\u003e\n\u003cp\u003eIn crystal healing traditions, the combination of Amethyst and Calcite within a single geode is considered a \u003cstrong\u003esynergistic pairing\u003c\/strong\u003e — each mineral amplifying and complementing the other’s energetic properties to create a more complete and powerful tool than either could provide alone:\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAmethyst — The Spiritual Anchor:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrown Chakra (Sahasrara)\u003c\/strong\u003e — opens the highest energy center, facilitating connection to higher consciousness, spiritual insight, and divine wisdom\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThird Eye Chakra (Ajna)\u003c\/strong\u003e — deepens intuition, psychic awareness, and the ability to perceive beyond surface appearances\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalming \u0026amp; protection\u003c\/strong\u003e — creates a tranquil, protective energetic field; absorbs and transmutes negative energy in the surrounding space\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeditation \u0026amp; spiritual growth\u003c\/strong\u003e — deepens meditative states, enhances dream recall, and supports sustained spiritual practice\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSobriety \u0026amp; mental clarity\u003c\/strong\u003e — the “stone of sobriety”; supports freedom from addictive patterns and mental fog\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eDogtooth Calcite — The Active Transformer:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll chakras — amplifier \u0026amp; cleanser\u003c\/strong\u003e — calcite is one of the most powerful energy amplifiers in the mineral kingdom; it is believed to double the energy of any stone it is paired with, making the amethyst’s properties significantly more potent in this combination\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMental clarity \u0026amp; intellectual growth\u003c\/strong\u003e — calcite is strongly associated with the mind; it clears mental fog, dissolves limiting beliefs, and accelerates learning and intellectual development\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActive transformation\u003c\/strong\u003e — the dogtooth\/scalenohedral habit specifically is associated with \u003cstrong\u003egut intuition, decisive action, and the courage to make necessary life changes\u003c\/strong\u003e; it is a “transformation stone” that activates rather than simply calms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpace cleansing\u003c\/strong\u003e — calcite is believed to cleanse stagnant energy from a space more rapidly than most minerals, making this geode particularly effective as a room-clearing tool\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEmotional balance\u003c\/strong\u003e — different calcite colors carry distinct emotional associations: white calcite brings clarity and new beginnings; orange calcite energizes, uplifts, and stimulates creativity and joy\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe Synergistic Dynamic:\u003c\/strong\u003e Amethyst provides the deep spiritual calm, protection, and higher-consciousness connection. Calcite amplifies that energy, clears the mental and energetic field to receive it, and adds the active, transformative quality that pure amethyst lacks. Together they create a \u003cstrong\u003ecomplete cycle: calm → clarity → transformation → growth\u003c\/strong\u003e — all within a single geological object.\u003c\/p\u003e\n\n\u003ch3\u003eHistorical \u0026amp; Cultural Significance\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eAmethyst\u003c\/strong\u003e carries one of the richest gemstone histories in human civilization — classified as a cardinal gemstone alongside diamond, ruby, sapphire, and emerald for most of Western history; favored by Cleopatra, Catherine the Great, and the British Royal Family (Royal Scepter); the bishop’s stone of the Catholic Church; associated with Saint Valentine; and demoted from “precious” to “semi-precious” status only after large Brazilian deposits were discovered in the 19th century.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCalcite\u003c\/strong\u003e has been used by humans since the Stone Age — the earliest known use of calcite is in \u003cstrong\u003ecave paintings\u003c\/strong\u003e, where powdered calcite (chalk) was used as a white pigment by Paleolithic artists over 40,000 years ago. \u003cstrong\u003eIceland spar\u003c\/strong\u003e — a variety of optical-quality calcite — was used by Viking navigators as a “sunstone” to locate the sun on overcast days through its double-refracting optical properties, a navigational technology recently confirmed by archaeological and scientific research. The \u003cstrong\u003eGreat Pyramid of Giza\u003c\/strong\u003e is constructed primarily of limestone — a sedimentary rock composed almost entirely of calcite — making calcite one of the most historically significant minerals in human architectural history.\u003c\/p\u003e\n\n\u003ch3\u003eCare \u0026amp; Display Notes\u003c\/h3\u003e\n\u003cp\u003ePlace on a flat, stable surface — the polished base provides secure footing without a stand. \u003cstrong\u003eHandle with particular care around the calcite crystals\u003c\/strong\u003e: at Mohs 3, dogtooth calcite points are significantly softer than the surrounding amethyst and can be chipped or broken by contact with harder surfaces or minerals. Avoid prolonged direct sunlight to preserve amethyst color. Dust gently with a soft brush — do not use water or chemical cleaners on the calcite, as calcite is soluble in acidic solutions and sensitive to moisture over time. Store away from harder minerals that could scratch the calcite surfaces.\u003c\/p\u003e","brand":"Rare Earth Gallery","offers":[{"title":"Default Title","offer_id":43089038475353,"sku":"8364","price":599.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/9096\/0473\/files\/IMG20251009115534.jpg?v=1771699266","url":"https:\/\/earthlytreasuresgallery.com\/products\/amethyst-with-scalenohedral-dogtooth-calcite-inclusions-geode-sculpture","provider":"Earthly Treasures Gallery","version":"1.0","type":"link"}