{"product_id":"green-opal-sphere-from-madagascar-280-grams-6-2-cm-drz4-10","title":"Green Opal Sphere From Madagascar 280 grams 6.2 cm \nDRZ4#10","description":"\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eGreen Opal from Madagascar is a yellow‑green to moss‑green\u003cspan class=\"Apple-converted-space\"\u003e  \u003c\/span\u003eopal with a waxy, earthy texture and subtle internal patterns. Its colour comes mainly from iron, with smaller contributions from vanadium and copper. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eGreen Opal from Madagascar is a o (opal‑CT) — meaning it’s made of microcrystalline silica containing tridymite and cristobalite, with tridymite usually more abundant. It often includes clay minerals such as saponite, and may contain tiny inclusions of epidote, goethite, and other iron‑bearing minerals. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eAppearance \u0026amp; Texture\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003e• Colour: Yellowish‑green to apple‑green, sometimes uneven due to natural spots, lamellae, or cavities.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003e• Transparency: Translucent to opaque.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003e• Lustre: Greasy to waxy.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003e• Patterns: Can show mossy, leafy, or cloudy internal structures; microstructures range from fine microspheres to cauliflower‑like textures. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003ePhysical Properties\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003e• Refractive index: ~1.435–1.460\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003e• Specific gravity: ~2.03–2.07\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003e• UV reaction: Inert under both long‑wave and short‑wave UV.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eThese values are typical for common opal and help distinguish it from other green minerals. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eFormation\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eStudies suggest Madagascar’s green opal forms under slow to moderate growth conditions, producing its characteristic microstructures and gentle colour zoning. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eUses \u0026amp; Value\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eGreen Opal from Madagascar is appreciated for:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003e• Carvings, cabochons, spheres, and decorative pieces\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003e• Its calming, earthy aesthetic\u003c\/span\u003e\u003c\/p\u003e","brand":"Shropshire Crystals Ltd","offers":[{"title":"Default Title","offer_id":57642692411774,"sku":null,"price":12.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0910\/5349\/0558\/files\/IMG-8394.heic?v=1783171977","url":"https:\/\/shropshirecrystals.com\/products\/green-opal-sphere-from-madagascar-280-grams-6-2-cm-drz4-10","provider":"Shropshire Crystals Ltd","version":"1.0","type":"link"}