{"product_id":"calcite-teaching-hand-display-specimen-of-massive-naturally-brown-calcite-copy","title":"calcite - teaching hand\/display specimen of massive white and naturally-brown  calcite","description":"\u003cp\u003e\u003cspan style=\"color: #990000;\"\u003e\u003cstrong\u003eThis calcite is recrystallized from a limestone in contact with a granitic intrusion. The brown color is unusual and is derived from iron in the limestone that was released by the metamorphism. It effervesces in dilute hydrochloric acid (muriatic acid is the same) as does all calcite.\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: #990000;\"\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #990000;\"\u003e\u003cstrong\u003eThe crystals of this calcite are interlocking, so it does not cleave into large rhombs, though individual specimens show many cleavage faces in several directions. The blue, green and variously wild-colors of the calcite you see being sold at rock shows and shops use an artificial dye. The brown in this calcite is entirely natural.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #990000;\"\u003e\u003cstrong\u003eBrown calcite is an interesting challenge to students who have been introduced to common white or light gray calcite. The rhombohedral cleavage is less important than the effervescence in dilute hydrochloric acid, and its Mohs scale hardness of 3, which means you can't scratch it with a fingernail, but you can scratch it with a penny to confirm the identification. \u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #990000;\"\u003e\u003cstrong\u003e Collected at the West End Chemical Company limestone quarry in the Slate Range in Inyo County at the north end of Searles Valley. The dolomitic limestone was burned to produce carbon dioxide for the carbonation process at the company's plant on Searles Lake, San Bernardino County, California. The quarry is inactive. The plant produced various salts from brines pumped from below the surface of Searles Lake.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #990000;\"\u003e\u003cstrong\u003e\u003cmeta charset=\"utf-8\"\u003eUSDA Farm Service Agency image of brine concentration ponds on Searles Lake in 2009. \u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cstrong\u003eClick images to select, click again to enlarge.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan style=\"color: rgb(255, 42, 0);\" class=\"s1\"\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 class=\"p1\"\u003e\u003cspan class=\"s1\" style=\"color: rgb(255, 42, 0);\"\u003e\u003cb\u003eShipping:\u003c\/b\u003e\u003c\/span\u003e\u003cb\u003e By Priority Mail or USPS Ground Advantage, whichever is cheaper, unless we find a better rate. Click \u0026gt; \u003c\/b\u003e\u003ca href=\"https:\/\/geologicalspecimensupply.com\/pages\/about-shipping\"\u003e\u003cspan class=\"s2\" style=\"color: rgb(43, 0, 255);\"\u003e\u003cb\u003ehere\u003c\/b\u003e\u003c\/span\u003e\u003c\/a\u003e\u003cb\u003e\u003ca href=\"https:\/\/geologicalspecimensupply.com\/pages\/about-shipping\"\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003e \u003c\/span\u003e\u003c\/a\u003e\u0026lt; for shipping rates. See comment at \u003c\/b\u003e\u003cspan class=\"s1\" style=\"color: rgb(255, 42, 0);\"\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\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003eMaking multiple purchases?\u003c\/span\u003e Click on the \"combine shipping\" button in the shopping cart. We'll send an invoice with combined shipping. It may not be instantaneous, since a human has to take a look and we might be out in the field during the day. A link in that invoice will bring you back to checkout, no hassle.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Geological Specimen Supply","offers":[{"title":"Default Title","offer_id":44412830679127,"sku":null,"price":9.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0960\/7650\/files\/calcitebrown_whiteH_D9.5pclcoin.jpg?v=1791191459","url":"https:\/\/geologicalspecimensupply.com\/products\/calcite-teaching-hand-display-specimen-of-massive-naturally-brown-calcite-copy","provider":"Geological Specimen Supply","version":"1.0","type":"link"}