{"product_id":"black-tourmaline-rough1","title":"Black Tourmaline - Rough","description":"\u003cp\u003e\u003cb\u003eOrigin\u003c\/b\u003e: Antsirabe Region, Madagascar\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDescription\u003c\/strong\u003e: Black tourmaline from Madagascar, commonly referred to as schorl, is one of the most abundant and recognizable tourmaline varieties. It typically forms in elongated, columnar crystals with strong vertical striations running along the length. In rough form, these pieces often show natural terminations or broken ends, with a deep black color and a slightly matte to vitreous luster. Madagascan material is known for producing well-formed crystals, often with good size and structural integrity.\u003c\/p\u003e\n\u003cp data-start=\"739\" data-end=\"1237\"\u003eThis tourmaline forms in pegmatites, which are extremely coarse-grained igneous rocks that crystallize from the final stages of magma cooling. These environments are rich in volatile elements like boron, which is essential for tourmaline formation. As the magma cools slowly, large crystals are able to develop, incorporating iron to produce the black coloration typical of schorl. Madagascar is a major global source of tourmaline, with deposits yielding a wide range of colors and crystal habits.\u003c\/p\u003e\n\u003cp data-start=\"1239\" data-end=\"1573\"\u003eBlack tourmaline is often associated with protection, grounding, and stability. Its dense, opaque appearance and strong crystal structure give it a solid, anchoring presence that many people are drawn to. It’s commonly chosen by those looking for a stone that feels steady and resilient, especially during periods of stress or change.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eChemical Composition\u003c\/b\u003e\u003cspan\u003e: NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄ (schorl variety of tourmaline)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eGrade\u003c\/strong\u003e: Lapidary \u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eAppearance\u003c\/strong\u003e:  Opaque\u003cbr\u003e\u003c\/span\u003e\u003cstrong\u003eCracks: \u003c\/strong\u003eMedium\/Many\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eApproximate Size of\u003c\/b\u003e\u003cb\u003e 1 pc\u003c\/b\u003e\u003cspan\u003e: 60mm x 50mm x 40mm\u003cbr\u003e\u003c\/span\u003e\u003cstrong\u003eApproximate Weight of 1 pc\u003c\/strong\u003e\u003cspan\u003e: 150g\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003ci\u003e\u003cspan\u003eRough is rough. We do our best to grade and describe pieces in the lot, but ultimately, they all differ.\u003c\/span\u003e\u003c\/i\u003e\u003c\/p\u003e","brand":"Madagascar","offers":[{"title":"Gram","offer_id":48167284277418,"sku":null,"price":0.12,"currency_code":"CAD","in_stock":true},{"title":"250 grams","offer_id":48167284310186,"sku":null,"price":30.0,"currency_code":"CAD","in_stock":true},{"title":"Kilogram","offer_id":48167284342954,"sku":null,"price":120.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0601\/7158\/3658\/files\/BlackTourmaline-Rough-6_9502f8d7-d6ea-421f-a2ab-873a53f8573c.jpg?v=1775692559","url":"https:\/\/rubblerockandgem.com\/ru\/products\/black-tourmaline-rough1","provider":"Rubble Rock And Gem","version":"1.0","type":"link"}