{"product_id":"calcite-with-boulangerite-inclusions-quartz-and-tetrahedrite","title":"CALCITE with  BOULANGERITE inclusions   QUARTZ and  TETRAHEDRITE","description":"A spectacular, 9.5 x 8 cm dome of interlocked cockscomb Calcite crystals, each averaging around 1.5 cm across, coloured jet-black by very finely disseminated Boulangerite inclusions; from the Herja mine at Chiuzbaia, Baia Mare, Romania.  Boulangerite, a lead antimony sulphide, forms very fine, hair-like acicular crystals within the Calcite and, under low magnification, also manifest on the surface of the crystals as very fine filaments. A 4 cm long greyish-milky Quartz crystal stands upright at one end and clumps of dark-grey granular Tetrahedrite sit within many of the Calcite rosettes.  A lustrous and very showy specimen.  ","brand":"Crystal Classics","offers":[{"title":"Default Title","offer_id":57781025505615,"sku":"CC19567","price":1480.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/3748\/2063\/files\/CC19567_3725caa9-1778-436c-9907-f938a66573a9.jpg?v=1783976853","url":"https:\/\/crystalclassics.co.uk\/products\/calcite-with-boulangerite-inclusions-quartz-and-tetrahedrite","provider":"Crystal Classics UK","version":"1.0","type":"link"}