{"product_id":"smoky-quartz-crystal-cluster-teaching-specimen","title":"smoky quartz crystal cluster - teaching specimen from Novo Horizonte, Bahia, Brazil","description":"\u003cp class=\"p1\"\u003e\u003cspan style=\"color: rgb(151, 12, 12);\"\u003e\u003cb\u003eTeaching smoky quartz cluster from Município Novo Horizonte, Bahia, Brazil. This area is famous for smoky quartz, often with rutile inclusions in the crystals.\u003c\/b\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan style=\"color: rgb(151, 12, 12);\"\u003e\u003cb\u003eSmoky quartz forms from natural gamma radiation released by surrounding rocks. The radiation causes aluminum atoms, which replace silicon atoms in the crystal lattice, to transfer an electron to a neighboring positively charged ion, often Li+, forming an aluminum metal color center that darkens the quartz.\u003c\/b\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan style=\"color: rgb(151, 12, 12);\"\u003e\u003cb\u003eThese attractive clusters are washed, but but otherwise are as collected. Often, the faces of gemmy smoky quartz crystals in a cluster are polished. These are useful as teaching specimens, with crystal faces as they came from the mine and perfect terminations..\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cb\u003eThe pencil is 5 1\/2\" long, for  scale.\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\" style=\"color: rgb(255, 42, 0);\"\u003e\u003cb\u003eSelect a specimen:\u003c\/b\u003e\u003c\/span\u003e\u003cb\u003e When more than one specimen is shown, you can select a particular specimen by telling us what is in the photo with it, either a black and silver pen, a black mechanical pencil (it has an eraser), or one of those plus some number of coins, or you can let us make the selection.\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan style=\"color: #ff0000;\"\u003e\u003cb\u003eMaking multiple purchases?\u003c\/b\u003e\u003c\/span\u003e\u003cb\u003e Click on the \"combine shipping\" button in the shopping cart. We'll send an invoice with combined shipping. A link in that invoice will bring you back to checkout, no hassle.\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e\u003cspan style=\"color: #ff2a00;\"\u003eShipping\u003c\/span\u003e:\u003c\/b\u003e\u003c\/span\u003e\u003cb\u003e By Priority Mail or USPS Ground Advantage, whichever is cheaper. Click \u0026gt; \u003c\/b\u003e\u003ca href=\"https:\/\/geologicalspecimensupply.com\/pages\/about-shipping\"\u003e\u003cspan style=\"color: #2b00ff;\" class=\"s2\"\u003e\u003cb\u003ehere\u003c\/b\u003e\u003c\/span\u003e\u003c\/a\u003e\u003cb\u003e \u0026lt; for shipping rates. See comment at \u003c\/b\u003e\u003cspan style=\"color: #ff2a00;\" class=\"s1\"\u003e\u003cb\u003eNote!\u003c\/b\u003e\u003c\/span\u003e\u003cb\u003e Use back button to return to this page.\u003c\/b\u003e\u003c\/p\u003e","brand":"Geological Specimen Supply","offers":[{"title":"Default Title","offer_id":42724004954199,"sku":null,"price":18.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0960\/7650\/files\/smokyquartzclusterNovoHorizonte_Brazil18.5pcl2coins3.jpg?v=1777014717","url":"https:\/\/geologicalspecimensupply.com\/products\/smoky-quartz-crystal-cluster-teaching-specimen","provider":"Geological Specimen Supply","version":"1.0","type":"link"}