Geology Johnson
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geologyjohnson.bsky.social
Geology Johnson
@geologyjohnson.bsky.social
3.3K followers 1.9K following 6.1K posts
Geologist of Precambrian mud and tiny fossils. Working Class. Northern. ND. He/Him. https://linktr.ee/worksofein
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Reposted by Geology Johnson
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
geologyjohnson.bsky.social
I'll be sure to report back!
November 17, 2025 at 9:38 PM
geologyjohnson.bsky.social
I'm hoping it's entertainingly bad.
November 17, 2025 at 9:14 PM
geologyjohnson.bsky.social
Sounds like I need to check out that series.
November 17, 2025 at 9:12 PM
geologyjohnson.bsky.social
I love this. Great work. Nausicaa is one of my favourite movies of all time.
November 17, 2025 at 2:31 PM
geologyjohnson.bsky.social
I'm torn between wanting to know more. But also enjoying the mystery. Also I'm very aware of how the Alien prequel lore changed things in ways I wasn't into.
November 17, 2025 at 1:16 PM
geologyjohnson.bsky.social
@jopabinia.bsky.social which crab is this?
November 16, 2025 at 9:50 PM