{"product_id":"auction-win-90329ac0-2b85-424b-87e1-14be9df2d88b","title":"Auction Win: Calcite (twinned)","description":"\u003cp\u003e\u003cstrong\u003eLocality:\u003c\/strong\u003e La Caverna, La Rampa, Buena Tierra Mine, Francisco Portillo, West Camp, Santa Eulalia Mining District, Aquiles Serdán Municipality, Chihuahua, Mexico\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSize:\u003c\/strong\u003e Miniature - 3.5 × 2.8 × 2.2 cm\u003c\/p\u003e\n\u003cp\u003eCalcite (CaCO3) is a carbonate mineral whose twinned crystals form when two individuals join across a specific plane. These distinctive twins reflect a crystallographic relationship involving a 180-degree rotation, creating mirrored forms with characteristic re-entrant angles.\u003cbr\u003e\u003cbr\u003eThe Buena Tierra Mine is located at Francisco Portillo in the West Camp of Mexico’s Santa Eulalia Mining District, Chihuahua, a historic silver and base-metal district known for massive sulfide manto and chimney orebodies with local iron-calcic skarns. It is particularly recognized for colorful calcite, including orange, orange-red, and hematite- or limonite-coated crystals, as well as distinctive butterfly-like twinned specimens. With Santa Eulalia’s long production history and celebrated mineral diversity, Buena Tierra material remains an appealing choice for collectors of classic Mexican calcite.\u003c\/p\u003e","brand":"Crystal Castle","offers":[{"title":"Default Title","offer_id":49783332536475,"sku":null,"price":5.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0336\/3012\/6217\/files\/e96f48fd-7fe6-45f6-9522-5143eafab30e_15ea5629-baba-4e64-b480-690f81bf915b.jpg?v=1791753067","url":"https:\/\/www.overtonfamilyjewels.com\/products\/auction-win-90329ac0-2b85-424b-87e1-14be9df2d88b","provider":"OFJ's Crystal Castle","version":"1.0","type":"link"}