{"product_id":"corundum-sapphire-8-rough-crystals-new-south-wales-australia-copy","title":"Hollandite- Virgin Valley, Humboldt County, Nevada, USA","description":"\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHollandite\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eVirgin Valley, Humboldt County, Nevada, USA\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eDimensions:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 3.7 × 3.7 × 2.5 cm\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eProvenance:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Original vintage collection label, catalog no. 133a, included with specimen.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA dark, massive Hollandite specimen displaying a charcoal-black to steel-gray coloration with subtle brownish undertones and a fine-grained, granular texture. Its irregular surfaces exhibit a subdued metallic to earthy luster, with scattered reflective mineral grains producing a delicate sparkle under direct illumination. The specimen features angular, naturally fractured edges and a compact, substantial form.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eHollandite is a barium manganese oxide mineral belonging to the hollandite group, recognized for its complex tunnel-like crystal structure. It commonly occurs in manganese-rich geological environments and is an interesting example of the mineralogical diversity associated with manganese oxide deposits. This vintage-labeled specimen originates from Virgin Valley in northern Nevada, a region particularly well known for its opal deposits and varied volcanic geology.\u003c\/span\u003e\u003c\/p\u003e","brand":"The Crystalary","offers":[{"title":"Default Title","offer_id":67933251010691,"sku":"barrydwr5-2of2-133a","price":25.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0390\/4634\/8931\/files\/IMG_34343.jpg?v=1792265935","url":"https:\/\/www.thecrystalary.com\/products\/corundum-sapphire-8-rough-crystals-new-south-wales-australia-copy","provider":"The Crystalary","version":"1.0","type":"link"}