The Guess the Gem answer is topaz!! It can be naturally blue, as well as other colours, but there are artificial methods to get blue too. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎

The Guess the Gem answer is topaz!! It can be naturally blue, as well as other colours, but there are artificial methods to get blue too. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
Guess the Gem time!! What mineral do you think these gems are? Hint: the blue colour is from irradiation on the left and cobalt diffusion on the right. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
A cute little rhomb of rhodochrosite, a shape you see in other minerals with a similar crystal structure. #MineralMonday #GeoscienceBluesky ⚒️🧪
A really cool massive halite crystal with a fluid inclusion!! Halite is a Mineral Cup favourite this year. #MineralMonday #MinCup26 #GeoscienceBluesky ⚒️🧪
Layers of bright yellow sulphur and crystals of celestine. It looks like a (non-edible) piece of cake! #MineralMonday #GeoscienceBluesky ⚒️🧪
The Guess the Gem answer is olivine!! It’s a mineral group that has the mineral species forsterite and fayalite. The gem variety is peridot. #GuessTheGem #GeoscienceBluesky ⚒️🧪💎
Another Mineral Cup Guess the Gem!! What mineral or group do you think these gems are? Hint: it’s the first winner. #GuessTheGem #GeoscienceBluesky #MinCup26 ⚒️🧪💎
Stress-free appreciation for cute little puffballs of okenite, no need to think about picking a favourite and voting since this mineral isn’t in this year’s Mineral Cup. #MineralMonday #GeoscienceBluesky ⚒️🧪
If you are attending SPNHC and missed my talk on using lessons from the past to curate the Anthropocene and the panel for the session, check out the recording, the discussion was great!! #GeoscienceBluesky #SPNHC2026 ⚒️🧪
The Guess the Gem answer is andalusite!! It’s a mineral that has the variety chiastolite that has inclusions that form a cross. #GuessTheGem #GeoscienceBluesky #MinCup26 ⚒️🧪💎
A Mineral Cup Guess the Gem!! What mineral do you think these gems are? Hint: it’s a very recent Mineral Cup challenger. #GuessTheGem #GeoscienceBluesky #MinCup26 ⚒️🧪💎
I present to you on this Mineral Monday a very fine crystal of monazite, one of today’s Mineral Cup challengers. This one is from Joaquim Felício, Brazil. #MineralMonday #GeoscienceBluesky #MinCup26 ⚒️🧪