{"product_id":"open-base-amethyst-cathedral-geode-brazil-4-25-lbs","title":"Open-Base Amethyst Cathedral Geode – Brazil – 4.25 lbs","description":"\u003cp class=\"PDq2pG_selectionAnchorContainer\"\u003eA substantial Open-Base Amethyst Cathedral Geode from Brazil, featuring a tall natural cavity lined with sparkling purple quartz crystals. Its broad arched opening, rugged natural exterior, and freestanding cathedral form create an impressive display from both the front and angled viewing positions.\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThe primary cavity contains dense amethyst crystallization extending across the interior walls. Individual points range from compact sparkling crystals to larger projecting terminations, producing considerable depth and reflective movement under direct lighting. The coloration varies naturally from pale lavender to richer purple, with subtle differences in saturation visible throughout the formation.\u003c\/p\u003e\n\u003cp\u003eA lighter quartz-rich border surrounds the crystallized interior and contrasts against the darker natural host rock. The preserved exterior displays the rugged texture of the original geode, allowing the specimen to retain its geological character while maintaining a strong upright silhouette.\u003c\/p\u003e\n\u003cp\u003eUnlike a fully enclosed cathedral, this specimen has an open base that reveals additional internal structure beneath the primary display cavity. This creates an especially interesting architectural presentation and allows the viewer to examine more of the geode’s natural formation.\u003c\/p\u003e\n\u003cp\u003eMeasuring approximately 7 × 5 × 6 inches and weighing 4.25 pounds, this is a substantial cabinet-sized amethyst specimen. Its balanced freestanding form, extensive crystal coverage, open-base construction, and classic Brazilian provenance make it an excellent centerpiece for a mineral collection, shelf, office, or natural-history display.\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cp\u003eMineral: Amethyst Quartz\u003c\/p\u003e\n\u003cp\u003eFormation: Open-base cathedral geode\u003c\/p\u003e\n\u003cp\u003eLocality: Brazil\u003c\/p\u003e\n\u003cp\u003eWeight: 4.25 lbs (approximately 1.93 kg)\u003c\/p\u003e\n\u003cp\u003eDimensions: Approximately 7 × 5 × 6 inches\u003c\/p\u003e\n\u003cp\u003eColor: Pale lavender, purple, colorless-to-white quartz, gray, brown, and natural earthy matrix tones\u003c\/p\u003e\n\u003cp\u003eCrystal Habit: Numerous terminated quartz crystals lining an open geode cavity\u003c\/p\u003e\n\u003cp\u003eInterior: Deep cathedral-style cavity with extensive amethyst crystallization\u003c\/p\u003e\n\u003cp\u003eBase: Naturally open formation with visible internal structure\u003c\/p\u003e\n\u003cp\u003eExterior: Rugged natural host rock and quartz-rich geode shell\u003c\/p\u003e\n\u003cp\u003eLuster: Vitreous to glass-like across the crystal faces\u003c\/p\u003e\n\u003cp\u003eTransparency: Transparent to translucent crystal points with opaque host matrix\u003c\/p\u003e\n\u003cp\u003eCrystal System: Trigonal\u003c\/p\u003e\n\u003cp\u003eChemical Formula: SiO₂\u003c\/p\u003e\n\u003cp\u003eMohs Hardness: Approximately 7\u003c\/p\u003e\n\u003cp\u003eDisplay: Naturally freestanding upright cathedral formation\u003c\/p\u003e\n\u003cp\u003eCondition: Natural mineral specimen with inherent contacts, incomplete crystals, matrix fractures, edge irregularities, inclusions, color variation, and preparation marks associated with extraction and base stabilization\u003c\/p\u003e\n\u003cp\u003eExact specimen shown\u003c\/p\u003e\n\u003ch2\u003eAbout Brazilian Amethyst\u003c\/h2\u003e\n\u003cp\u003eAmethyst is the purple variety of quartz. Its coloration develops from trace iron within the crystal structure combined with natural geological irradiation. Differences in chemistry, crystal growth, and exposure can create variations ranging from delicate lavender to saturated violet within the same formation.\u003c\/p\u003e\n\u003cp\u003eBrazil is one of the world’s most important sources of amethyst geodes and cathedral formations. These specimens developed inside cavities in ancient volcanic rock. Over long geological periods, silica-rich fluids entered the openings and deposited layers of chalcedony and quartz, eventually producing the inward-pointing amethyst crystals visible today.\u003c\/p\u003e\n\u003cp\u003eThe term “cathedral” describes a tall geode section with an arched, chamber-like opening. It is a trade and collector description based on the specimen’s appearance rather than a separate mineral variety.\u003c\/p\u003e\n\u003cp\u003eProlonged exposure to strong direct sunlight may gradually fade amethyst. Display the specimen away from intense window light and clean it carefully with a soft dry brush or gentle air blower.\u003c\/p\u003e\n\u003ch2\u003eCollector Notes\u003c\/h2\u003e\n\u003cp\u003eThis specimen features:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNatural Brazilian amethyst\u003c\/li\u003e\n\u003cli\u003eSubstantial 4.25-pound cabinet size\u003c\/li\u003e\n\u003cli\u003eApproximately 7-inch presentation\u003c\/li\u003e\n\u003cli\u003eUpright cathedral-style silhouette\u003c\/li\u003e\n\u003cli\u003eDistinctive open-base formation\u003c\/li\u003e\n\u003cli\u003eVisible internal structure beneath the main cavity\u003c\/li\u003e\n\u003cli\u003eExtensive amethyst crystal coverage\u003c\/li\u003e\n\u003cli\u003eNumerous naturally terminated quartz points\u003c\/li\u003e\n\u003cli\u003ePale lavender-to-purple coloration\u003c\/li\u003e\n\u003cli\u003eStrong sparkle under direct lighting\u003c\/li\u003e\n\u003cli\u003eDeep three-dimensional crystallized cavity\u003c\/li\u003e\n\u003cli\u003eContrasting pale quartz border\u003c\/li\u003e\n\u003cli\u003eRugged natural host-rock exterior\u003c\/li\u003e\n\u003cli\u003eStable freestanding presentation\u003c\/li\u003e\n\u003cli\u003eMultiple attractive viewing angles\u003c\/li\u003e\n\u003cli\u003eOne-of-a-kind natural mineral formation\u003c\/li\u003e\n\u003cli\u003eExact specimen pictured\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePerfect for collectors of Brazilian amethyst, cathedral geodes, open-base geodes, purple quartz, volcanic mineral formations, cabinet specimens, and statement-sized crystal displays.\u003c\/p\u003e\n\u003cp\u003eProfessionally packaged and shipped from Colorado.\u003c\/p\u003e\n\u003cp\u003eYou will receive the exact specimen shown.\u003c\/p\u003e\n\u003cp\u003eEvery order is backed by our commitment to quality and customer satisfaction. Thank you for supporting our family-owned small business.\u003c\/p\u003e","brand":"Serenity Soul Stones","offers":[{"title":"Default Title","offer_id":49860435116282,"sku":null,"price":153.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0837\/2328\/8826\/files\/Open-BaseAmethystCathedralGeode_Brazil_4.25lbs_1.jpg?v=1785356444","url":"https:\/\/serenitysoulstones.com\/products\/open-base-amethyst-cathedral-geode-brazil-4-25-lbs","provider":"Serenity Soul Stones","version":"1.0","type":"link"}