{"product_id":"cassiterite-31","title":"CASSITERITE","description":"We seldom see good crystals of Cassiterite from the tin-tungsten deposit at Kr'sno in the Karlovy Vary Region of the Czech Republic, so this part-stellate repeated twin is a superb find from a recently purchased collection.  Cassiterite, a tin oxide, here forms roughly half of a sixling twin, with one whole and two-part arms of the sixling remaining.  The valleys between each of the three limbs are formed by the sharply defined re-entrant angles of the repeated twinned-pairs.  The coal-black faces are smooth with a bright reflective metallic lustre and in the exposed base can be seen small inclusions of milky Quartz.  A splendid twinned Cassiterite from the old Kr'sno Sn-W deposit.","brand":"Crystal Classics","offers":[{"title":"Default Title","offer_id":46584157339823,"sku":"CC19813","price":350.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/8516\/2671\/files\/CC19813.png?v=1771845487","url":"https:\/\/crystalclassics.com\/products\/cassiterite-31","provider":"Crystal Classics","version":"1.0","type":"link"}