Erika Anderson
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andersonmineral.bsky.social
Erika Anderson
@andersonmineral.bsky.social
Former Curator of Mineralogy and Petrology. MSc in Volcanology. Views are my own.
Green epidote from an old teaching collection. It was fun to see minerals that trained geologists in the past. #MineralMonday #GeoscienceBluesky ⚒️🧪
December 22, 2025 at 12:44 PM
A folded schist from Scotland showing that the different layers react to the tectonic forces, some folding easier than others. #FridayFold ⚒️🧪
December 19, 2025 at 1:01 PM
The answer to this Guess the Gem is fire opal. Opal is not a mineral, it’s actually a mineraloid!! #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
Guess the Gem Tuesday!! What do you think these gems are? Hint: it’s made up of spheres. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
December 17, 2025 at 12:35 PM
Guess the Gem Tuesday!! What do you think these gems are? Hint: it’s made up of spheres. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
December 16, 2025 at 12:28 PM
Fluorite crystal looking as cool as ice.
#MineralMonday #GeoscienceBluesky ⚒️🧪
December 15, 2025 at 12:34 PM
Just a beautiful fold!! I hope even non-geologists can appreciate the beauty of what pressure can do to a rock. #FoldFriday #GeoscienceBluesky ⚒️🧪
December 12, 2025 at 12:39 PM
The answer to this Guess the Gem is kornerupine!! Prismatine has been established as a separate mineral with a different chemical composition. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
Another Guess the Gem !! What mineral do you think this gem is? Hint: also known as prismatine. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
December 10, 2025 at 11:35 AM
Another Guess the Gem !! What mineral do you think this gem is? Hint: also known as prismatine. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
December 9, 2025 at 12:39 PM
Fiery topaz from Minas Gerais, Brazil!! Helped by some dramatic lighting. The region is known for its pegmatites, a rock type made of large crystals that can sometimes get massive!! #MineralMonday #GeoscienceBluesky ⚒️🧪
December 8, 2025 at 12:32 PM
Reposted by Erika Anderson
Orbicular granite
December 6, 2025 at 4:18 AM
This Megarachne may not actually be a spider, but my spidey senses are still pretty scared of it. #FossilFriday⚒️🧪
December 5, 2025 at 12:43 PM
Been looking for her and her husband’s mineral collection, if anyone has any info. #GeoscienceBluesky ⚒️🧪
November 29, 2025 at 10:35 PM
This is a skull of one of the biggest duck-billed dinosaur species, Edmontosaurus regalis. #FossilFriday⚒️🧪🦖
November 28, 2025 at 12:24 PM
The answer to this Guess the Gem is spinel!! This one was part of the Treasury of Saint-Denis in France. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
Guess the Gem time!! What mineral do you think this gem is? Hint: in the past gems of this mineral were called rubies, though now the term refers to corundum. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
November 26, 2025 at 12:41 PM
Reposted by Erika Anderson
Kīlauea is erupting! 🌋 Here’s a link to one of the three @USGS live cams - enjoy! www.youtube.com/live/tk0tfYD...
November 26, 2025 at 2:04 AM
Guess the Gem time!! What mineral do you think this gem is? Hint: in the past gems of this mineral were called rubies, though now the term refers to corundum. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
November 25, 2025 at 12:37 PM
Great little crystal of bright orange scheelite. It would be surprisingly heavy if you held it due to the tungsten in this mineral. #MineralMonday #GeoscienceBluesky ⚒️🧪
November 24, 2025 at 12:20 PM
Reposted by Erika Anderson
It's Friday, and apparently bluesky is ready for this fun revelation:

Dinosaurs lived on the other side the Galaxy.
November 21, 2025 at 5:11 PM
Reposted by Erika Anderson
Want to visit Siccar Point but can’t get out or it’s too far away?

@callanbentley.bsky.social has made this amazing online field-guide, including gigapan images and some fantastic virtual outcrops that you can explore in 3D. Check it out!

opengeology.org/historicalge...
VFE: Siccar Point, Scotland – Historical Geology
opengeology.org
November 22, 2025 at 10:38 AM
The skull of a giant sloth, Megatherium americanum, from South America. This species went extinct, along with most other megafauna, in the Late Pleistocene Extinction Event thought to be caused by humans and changes in the climate. #FossilFriday
November 21, 2025 at 12:27 PM
The answer is topaz!! It’s a mineral that can be a few different colours. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
Guess the Gem!! What mineral do you think these two gems are? Hint: the blue one is irradiated and heated to get that colour.
#GuessTheGem #GeoscienceBluesky ⚒️🧪💎
November 19, 2025 at 11:54 AM
Guess the Gem!! What mineral do you think these two gems are? Hint: the blue one is irradiated and heated to get that colour.
#GuessTheGem #GeoscienceBluesky ⚒️🧪💎
November 18, 2025 at 11:41 AM
Have you ever heard of this mineral? Pachnolite was discovered in Greenland and the name translates to frost stone, which is a very cool name. #MineralMonday #GeoscienceBluesky ⚒️🧪
November 17, 2025 at 12:34 PM
The metamorphic mineral staurolite with its distinctive penetration twinning forming a cross. It’s positively delightful!! #MineralMonday #GeoscienceBluesky ⚒️🧪
November 10, 2025 at 12:23 PM
As cool and cute as sabre-toothed tigers are, at least I don’t have to fear staring down the maw of Smilodon populator these days. #FossilFriday ⚒️🧪
November 7, 2025 at 12:43 PM