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Fibrous Asbestos Crocidolite. Riebeckite forms in two very different habits. The darker-colored forms which are individually crystallized are generally of igneous origin, such as volcanic rock and pegmatites. The finely fibrous variety, known as Crocidolite, usually originates from altered metamorphic rocks. The Crocidolite variety is a type of asbestos, and is sometimes also referred to as "blue asbestos". It is considered to be the most hazardous form of asbestos

Fibrous Asbestos Crocidolite - The Mineral and Gemstone Kingdom

minerals.net

The El-Dorado Topaz, which weighs a whopping 31,000 carats (13.67 lbs.) currently holds the crown as the largest faceted gemstone in the world. Originally discovered in 1984 in mineral-rich Minas Gerais, Brazil, the pre-cut El-Dorado crystal tipped the scales at a mind-boggling 81.57 lbs.

Kyanite with Quartz; Minas Gerais, Brazil

PYROMORPHITE Daoping Mine, Gongcheng Co., Guilin Prefecture, Guangxi Province, China, Asia

Blue Sapphire Crystal Natural Gemstone Raw by FenderMinerals,

Aragonite from China / Mineral Friends ♥

Fluorite with calcite | hollys2006 on Flickr. Annabel Lee Mine, Hardin County, Illinois, US.

* WORLDS RAREST MINERALS. TAAFFEITE, pronounced TAR-fite, is named after gemologist Richard Taaffe who discovered the first one from a box of Sri Lankan spinels in 1945. The stone displayed a double refraction which was uncharacteristic of spinel. All the faceted taaffeites currently in existence would fill about half a cup. Of the rarest red variety there are fewer than ten specimens. Clean colorless-to-mauve stones go for between $500.00 - $4000.00 per carat #travel