{"product_id":"chalcopyrite-statement-specimen-19-7-lbs-casteel-no-35-mine","title":"Chalcopyrite Statement Specimen 19.7 lbs — Casteel No. 35 Mine","description":"\u003cdiv class=\"product-description\"\u003e\n\u003ch2\u003eChalcopyrite on Druzy Quartz — Casteel No. 35 Mine\u003c\/h2\u003e\n\u003cp\u003eA museum-quality statement specimen of iridescent chalcopyrite crystals on a druzy quartz and dolomite matrix from the Casteel No. 35 Mine in the Viburnum Trend, Iron County, Missouri. 19.7 lbs, approximately 14x12x5 inches. The rainbow iridescence — blues, purples, and golds — is entirely natural, created by light diffracting off thin oxide films on the chalcopyrite crystal faces. A centerpiece-grade specimen from one of the world's most important lead-zinc mining districts.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTRANSFORM · GROUND · ILLUMINATE\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdetails class=\"collapsible-section\"\u003e\u003csummary\u003eAbout Casteel Mine Chalcopyrite\u003c\/summary\u003e\u003cp\u003eThe Casteel Mine (Viburnum No. 35) in Iron County, Missouri is part of the Viburnum Trend — one of the world's most important lead-zinc mining districts. While primarily mined for galena and sphalerite, the Casteel produces exceptional specimen-quality chalcopyrite, quartz, dolomite, and calcite as byproducts. Chalcopyrite on druzy quartz from this locality is particularly sought after by collectors because the sparkling quartz matrix amplifies the rainbow iridescence of the chalcopyrite.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails class=\"collapsible-section\"\u003e\u003csummary\u003eDetails\u003c\/summary\u003e\u003cul\u003e\n\u003cli\u003eMineral: Chalcopyrite (CuFeS₂) on Druzy Quartz \u0026amp; Dolomite\u003c\/li\u003e\n\u003cli\u003eWeight: 19.7 lbs\u003c\/li\u003e\n\u003cli\u003eSize: Approx 14x12x5 inches\u003c\/li\u003e\n\u003cli\u003eOrigin: Casteel No. 35 Mine, Viburnum Trend, Iron County, Missouri, USA\u003c\/li\u003e\n\u003cli\u003eOne of a kind\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/details\u003e\n\u003c\/div\u003e","brand":"Avant","offers":[{"title":"Default Title","offer_id":53976720048417,"sku":"CHALCO-DQ-19.700","price":2200.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0252\/6845\/3410\/files\/chalco-statement-19.7-1.jpg?v=1792360860","url":"https:\/\/www.crystals.com\/products\/chalcopyrite-statement-specimen-19-7-lbs-casteel-no-35-mine","provider":"CRYSTALS.COM","version":"1.0","type":"link"}