{"product_id":"phosphorescent-calcite-crystals-on-druzy-quartz-in-basalt-pocket-87x4","title":"Phosphorescent Calcite Crystals with Druzy Quartz \u0026 Heulandite in Chalcedony Lined Basalt Pocket","description":"\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eFluorescent and phosphorescent calcite, which is covered in druzy quartz, and accompanied by Heulandite, on \u003c\/span\u003ewith a classic zeolite assemblage with chalcedony-lined basalt vesicle.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eThis specimen is a classic example of secondary mineralization from the basalt cavities of the Deccan Traps in western India, an area world-renowned for producing aesthetic calcite, quartz, and zeolite combinations.\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eThe piece displays a cross-section through a mineralized gas vesicle (lava “bubble”). It is cut and ground into the traditional Jalgaon display form—flat-bottom and self-standing—so the pocket is presented face-forward. This style of display reveals the vesicle wall, the interior mineral linings, and—most importantly—the complete sequence of mineral growth preserved within a single cavity.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eUV Fluorescence\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eThe calcite displays notable luminescent properties:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s2\"\u003eLongwave UV (365 nm):\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eStrong, cyan to aqua fluorescence across the calcite crystals.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s2\"\u003ePhosphorescence:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eA faint greenish afterglow is visible after UV exposure, somewhat more pronounced following shortwave illumination.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eThat color mix — cyan fluorescence with greener afterglow - is consistent with Mn-activated calcite with minor secondary activators and \u003cspan class=\"s1\"\u003etrace Pb or rare earth elements (not uncommon in Deccan Trap cavity calcites)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eAdditional white to pale peach crystals present on the piece are heulandite, a common zeolite associated with calcite and quartz in Deccan Trap cavities.\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e\u003cspan class=\"s1\"\u003e\u003c\/span\u003eSize: 72 x 97 x 62 mm. 400 grams. \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eJalgaon District, Maharashtra, India (Deccan Traps).\u003c\/span\u003e\u003c\/p\u003e","brand":"OLD EARTH MINERALS","offers":[{"title":"Default Title","offer_id":40844739444865,"sku":"15892","price":120.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/9433\/1777\/files\/82E113F4-C946-41FF-9FE1-F84DC516FBAC.jpg?v=1785785875","url":"https:\/\/oldearthminerals.com\/products\/phosphorescent-calcite-crystals-on-druzy-quartz-in-basalt-pocket-87x4","provider":"OLD EARTH MINERALS","version":"1.0","type":"link"}