{"product_id":"black-opal-1","title":"Black Opal","description":"\u003cp\u003eBlack Opal natural mineral from gracios o dios mine gracias a dios department Honduras\u003c\/p\u003e\n\u003cp\u003eSize-\u003cbr\u003e6.2cm x 3.7cm x 2.2cm\u003c\/p\u003e\n\u003cp\u003eWeight-\u003cbr\u003e62g\u003c\/p\u003e\n\u003cp\u003eYou will receive the item in the photo\u003c\/p\u003e\n\u003cp\u003eCrystal system- Amorphous (non-crystalline). Rather than an organized crystal structure,its internal makeup consists of billions of submicroscopic silica spheres arranged in a regular three dimensional grid that acts as a diffraction grating for light.\u003cbr\u003eMineral class- Mineraloid. Because it lacks a crystalline structure and contains a variable amount of water, it cannot be categorised as a true mineral. Under chemical classification it belongs to the hoarder group of oxides\/silicates.\u003cbr\u003eHardness- 5.5-6.5 on the MOHs scale.\u003cbr\u003eRock formation- Primarily sedimentary. Black opals are formed over millions of years as silica-rich ground water percolates down through weathered sandstone,mudstone and clay stone. The solution settles into underground cracks,faults and voids left by decomposing fossils. As the water slowly evaporates it leaves behind a harder gel deposits.\u003c\/p\u003e","brand":"Crystal and fossils","offers":[{"title":"Default Title","offer_id":62632870478211,"sku":null,"price":18.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0563\/2524\/3040\/files\/FullSizeRender_2d49cb8f-e124-4528-946d-910f654ea83b.heic?v=1789577603","url":"https:\/\/crystalandfossils.co.uk\/products\/black-opal-1","provider":"Crystal and fossils","version":"1.0","type":"link"}