{"product_id":"magnesite-nodular-form-of-vitreous-magnesite-unit-of-10-smaller-specimens","title":"magnesite - nodular form of vitreous magnesite - unit of 12 smaller specimens","description":"\u003cp\u003e\u003cspan style=\"color: #990000;\"\u003e\u003cb\u003eMagnesite, MgCO\u003c\/b\u003e\u003cb\u003e\u003csub\u003e3\u003c\/sub\u003e\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #990000;\"\u003e\u003cb\u003eMagnesite, magnesium carbonate, is usually earthy or granular, but it can be massive vitreous or crystalline and can occur in the form of nodules up to several feet in diameter. This particular magnesite is the cryptocrystalline vitreous nodular form. When vitreous magnesite was first discovered in Muddy Valley, Nevada in the late 1800s, it was thought to be kaolin and plans were made to mine it as such. In 1915, before mining could begin, a specimen sent to the U.S. Geological Survey was identified as magnesite.\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #990000;\"\u003e\u003cb\u003eHard kaolin looks much like this variety of magnesite. Both break with a sharp-edged fracture. Magnesite, when powdered by taps of a geologist’s hammer, will effervesce with hydrochloric acid. There is no reaction with kaolin. An alternate test is to scrape the magnesite on a streak plate to produce a powder. A drop of hydrochloric acid will produce the effervescence, but it can be subtle.\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #990000;\"\u003e\u003cb\u003eThese specimens were collected at the Windous magnesite deposit, near Windous Butte, roughly 20 miles west of Ely, Nevada. The deposit, apparently hydrothermally altered volcanic ash, was mined in 1940-41 by Westvaco Chlorine Products Corp. The mine is inactive, but specimens from this deposit have been dyed and sold as turquoise.\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #990000;\"\u003e\u003cb\u003eThe field photo shows a large magnesite nodule that had been extracted when the mine was still active. Smaller nodules weather out of the mine tailings.\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\" style=\"color: #ff2a00;\"\u003e\u003cb\u003eShipping:\u003c\/b\u003e\u003c\/span\u003e\u003cb\u003e in a First Class package unless combined with other items. Click \u0026gt; \u003ca href=\"https:\/\/geologicalspecimensupply.com\/pages\/about-shipping\"\u003e\u003cspan style=\"color: #2b00ff;\"\u003ehere\u003c\/span\u003e\u003c\/a\u003e \u0026lt; for shipping rates. Use back button to return to this page.\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff0000;\"\u003e\u003cb\u003eMaking multiple purchases?\u003c\/b\u003e\u003c\/span\u003e\u003cspan\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\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Geological Specimen Supply","offers":[{"title":"Default Title","offer_id":39792377364567,"sku":"","price":6.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0960\/7650\/products\/magnesitenodulesStsmallsetof106.2.jpg?v=1654678539","url":"https:\/\/geologicalspecimensupply.com\/products\/magnesite-nodular-form-of-vitreous-magnesite-unit-of-10-smaller-specimens","provider":"Geological Specimen Supply","version":"1.0","type":"link"}