{"product_id":"calcite-on-goethite-epimorphs-after-selenite-santa-eulalia-mexico-0-61-lbs","title":"Calcite on Goethite Epimorphs After Selenite – Santa Eulalia, Mexico – 0.61 lbs","description":"\u003cp\u003e\u003cspan\u003eA dramatic mineralogical pseudomorph-style formation from Santa Eulalia, Chihuahua, Mexico, featuring sparkling calcite crystals growing across dark goethite epimorphs after selenite. Mounted vertically for display, this architectural specimen measures approximately 6 inches tall and presents a striking contrast between bright crystalline calcite and nearly black iron-oxide forms.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe specimen is dominated by overlapping blades, hollow shells, and angular structures created when goethite coated earlier selenite crystals. The original selenite provided the underlying shape, while subsequent alteration or removal left the dark goethite preserving its bladed geometry. Numerous broken or open sections expose the shell-like construction and reveal golden-brown interiors along selected edges.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eColorless-to-pale champagne calcite occupies several areas along one side of the formation. These crystals form sparkling aggregates with sharp reflective faces, adding a luminous focal point against the dark brown and black goethite. Smaller calcite growths and mineralized pockets appear between the larger blades, rewarding close inspection from multiple angles.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe reverse emphasizes the goethite architecture, displaying stacked plates, curved remnants, recessed cavities, and rugged iron-rich textures. Its tall sculptural profile and complex replacement history make this an especially interesting specimen for collectors of Mexican minerals, epimorphs, pseudomorph-related formations, calcite, and iron oxides.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eSpecifications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003ePrimary Minerals: Calcite and goethite\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFormation: Calcite on goethite epimorphs preserving earlier selenite crystal forms\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLocality: Santa Eulalia Mining District, Chihuahua, Mexico\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWeight: 0.61 lbs, approximately 277 grams\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDimensions: Approximately 2.5 × 6 × 3 inches\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eColor: Black, dark chocolate brown, rusty brown, golden ochre, colorless, pale champagne, and icy white\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGoethite Habit: Overlapping bladed, hollow, shell-like, and angular epimorph structures\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCalcite Habit: Transparent-to-translucent crystalline aggregates with bright reflective faces\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLuster: Vitreous across the calcite; submetallic, earthy, and locally reflective across the goethite\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTransparency: Transparent-to-translucent calcite over opaque goethite\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eChemical Formulas: CaCO₃ for calcite; FeO(OH) for goethite\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDisplay: Mounted upright on a fitted black display base\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCondition: Natural specimen with inherent contacts, open epimorph shells, incomplete blades, broken edges, cavities, surface deposits, mineral staining, and irregularities associated with replacement, extraction, and preparation\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eExact specimen shown\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eAbout Goethite Epimorphs After Selenite\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eAn epimorph forms when one mineral coats an earlier crystal and preserves its exterior shape. If the original mineral later dissolves or alters, a hollow or partially hollow shell may remain. Here, the bladed forms are identified as goethite epimorphs after selenite, recording the geometry of the earlier selenite growth.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLater calcite crystallization added transparent and champagne-toned sparkle across portions of the darker formation. This sequence of mineral growth gives the specimen both its unusual architecture and its pronounced contrast.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGoethite is an iron oxyhydroxide, while calcite is calcium carbonate. Both can occur within the oxidized, mineral-rich environments of the historic Santa Eulalia mining district.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eCollector Notes\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThis specimen features:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eNatural calcite and goethite from Santa Eulalia, Mexico\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eGoethite epimorphs preserving earlier selenite forms\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHollow and partially open bladed structures\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eLayered, sculptural iron-oxide architecture\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSparkling colorless-to-champagne calcite\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDramatic light-versus-dark mineral contrast\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eGolden-brown exposed edges and interiors\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eNumerous cavities and recessed mineralized pockets\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eApproximately 6-inch upright profile\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eMounted, ready-to-display presentation\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eStrong visual interest from every side\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eExact specimen pictured\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eProfessionally packaged and shipped from Colorado.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eYou will receive the exact specimen shown.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eThank you for supporting our family-owned small business.\u003c\/span\u003e\u003c\/p\u003e","brand":"Serenity Soul Stones","offers":[{"title":"Default Title","offer_id":50585309937914,"sku":null,"price":122.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0837\/2328\/8826\/files\/CalciteonGoethiteEpimorphsAfterSelenite_SantaEulalia_Mexico_0.61lbs_1.jpg?v=1790367015","url":"https:\/\/serenitysoulstones.com\/products\/calcite-on-goethite-epimorphs-after-selenite-santa-eulalia-mexico-0-61-lbs","provider":"Serenity Soul Stones","version":"1.0","type":"link"}