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.
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
Reposted by Erika Anderson
Oh my gosh. These are both super cool. Ilmenite is amazing, and I love titanium...but I think I'm gonna vote for the super unusual #Jadarite, which is a lithium borate.
#OreCup R1M3: It’s a battle of black and white as titanium ore #Ilmenite is pitted against lithium and boron ore #Jadarite.

vote: www.mineralcup.org/vote-results...
results:
www.mineralcup.org
November 5, 2025 at 8:56 PM
Reposted by Erika Anderson
We're Team #Ilmenite today in the #OreCup! Not only did it enable Bob Ross's happy little clouds, it also may have helped flip the Moon's mantle. So versatile! 🔭🧪🌕

eos.org/articles/the...
November 5, 2025 at 6:25 PM
Ah yes!! Another bacon specimen!! This time it’s banded aragonite. #MineralMonday #GeoscienceBluesky ⚒️🧪
November 3, 2025 at 12:35 PM
The answer is the iron ore hematite!! A streak is when you rub a mineral on a slightly rough surface to see what colour the powder left behind is. The streak helps identify the mineral, as it might be different than the colour of the specimen. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
Another Tuesday Guess the Gem!! What mineral do you think these gems are? Hint: their streak would be red.
#GuessTheGem #GeoscienceBluesky ⚒️🧪💎
October 29, 2025 at 11:40 AM
Another Tuesday Guess the Gem!! What mineral do you think these gems are? Hint: their streak would be red.
#GuessTheGem #GeoscienceBluesky ⚒️🧪💎
October 28, 2025 at 11:33 AM
Another bright mineral!! The element sulphur makes these beautiful crystals. Be careful, sometimes the warmth of your hand can cause these sensitive crystals to crack. #MineralMonday #GeoscienceBluesky ⚒️🧪
October 27, 2025 at 11:34 AM
When first described, the perceived agility of the theropod Deinonychus antirrhopus helped catalyze the idea that dinosaurs were not as slow moving as previously thought. #FossilFriday ⚒️🧪🦖
October 24, 2025 at 11:47 AM
The answer to this Guess the Gem is peridot!! This is a variety of the mineral group olivine, frequently found in basalts (and found in some meteorites!). #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
Another Guess the Gem for you!! What mineral or variety do you think this gem is? Hint: this is the gem variety of a mineral commonly found in my favourite type of rock: volcanic.
#GuessTheGem #GeoscienceBluesky ⚒️🧪💎
October 22, 2025 at 11:16 AM
Another Guess the Gem for you!! What mineral or variety do you think this gem is? Hint: this is the gem variety of a mineral commonly found in my favourite type of rock: volcanic.
#GuessTheGem #GeoscienceBluesky ⚒️🧪💎
October 21, 2025 at 11:32 AM
The most delectable rhodochrosite!! Bright minerals make me very happy!! From bright butterfly wings to the plumage of birds of paradise, nature is a tapestry of rich colours. #MineralMonday #GeoscienceBluesky ⚒️🧪
October 20, 2025 at 11:26 AM
Skull of the Early Triassic amphibian Thoosuchus jakovlevi. Lots of surface texture preserved on it!! #FossilFriday ⚒️🧪
October 17, 2025 at 11:53 AM