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derekroggg.bsky.social
@derekroggg.bsky.social
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nadwgab.bsky.social
318 of #365Minerals 🧪⚒️

Scheelite:
- A calcium tungstate mineral
- An important ore of tungsten
- Forms during contact metamorphism and in hydrothermal veins
- Named after Carl Wilhelm Scheele (1742-1786), a Swedish chemist #minerals
A fine crust of brown scheelite crystals coating a double terminated smoky quartz crystal. From Horní Slavkov, Karlovy Vary Region, Czech Republic. Specimen on display in the Natural History Museum, London. Orange bipyramidal crystals of scheelite. From Carrock Mine, Cumbria, England, UK. Specimen on display in the Natural History Museum, London.
November 14, 2025 at 10:09 AM
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nadwgab.bsky.social
319 of #365Minerals 🧪⚒️

Monazite:
- A phosphate mineral series with species rich in cerium, lanthanum, neodymium, samarium or gadolinium
- Radioactive due to thorium and sometimes uranium
- Its name comes from the Greek word "μονάζειν/monázein (to be alone) because of its isolated crystals #minerals
A brown fragment of a prismatic monazite crystal. From Mount Garnet, Queensland, Australia. Specimen on display in the Natural History Museum, London. A test tube containing brown graines of monazite in sand. From South Bukuru, Nigeria. Specimen on display in the Natural History Museum, London.
November 15, 2025 at 7:49 AM
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nadwgab.bsky.social
321 of #365Minerals 🧪⚒️

Biotite:
- A mica group mineral
- Forms in igneous and metamorphic rocks
- Can be used to date rocks
- Named after Jean-Baptiste Biot (1774-1862), a physicist who studied the optical properties of mica #minerals #MineralMonday
Bulky-looking black pirsms of biotite in a grey pegmatite. From Langesundsfjord, Norway. Specimen on display in the Natural History Museum, London. A black shiny cleavage slab of biotite, shaped like a wonky coffin. From Mexico. Specimen on display in the Natural History Museum, London. A black diamond-shaped biotite crystal in a grey spotty trachyte rock. From Ústecký kraj, Czech Republic. Specimen on display in the Natural History Museum, London.
November 17, 2025 at 10:50 AM
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nadwgab.bsky.social
320 of #365Minerals 🧪⚒️

Tremolite:
- An amphibole group mineral
- The fibrous form is classed as asbestos
- Forms via the metamorphism of quartz and dolomite rich sediments
- Named after Tremola Valley in Tessin, Switzerland #minerals
Cream silky fibres of tremolite with colourless and opaque crystals of adularia and green chlorite. From St. Gotthard, Switzerland. Specimen on display in the Natural History Museum, London.
November 16, 2025 at 12:58 PM