Guess the Gem time!! What mineral or variety do you think this gem is? Hint: it has an asterism. #GuessTheGem #GeoscienceTwitter
Books of thin muscovite crystals on albite crystals. Mica is sometimes touted as an eco friendly alternative for plastic glitter, but is sometimes still covered in plastic, and child labour can be an issue in its mining. #MineralMonday #GeoscienceTwitter
Another Guess The Gem for you!! What mineral do you think this gem is? Hint: it’s hardness is somewhere close to the middle on the Mohs scale. #GuessTheGem #GeoscienceTwitter
The answer is orthoclase!! This feldspar is the example mineral at 6 on the Mohs scale. #GuessTheGem #GeoscienceTwitter
Amethyst from Vălişoara, Romania, though its label has the old name
Porkura, Hungary. You have to keep up with historical changes with old collections. Looks like beautiful crystalline coral! #MineralMonday #GeoscienceTwitter
Did minerals evolve? Is a mineral different if it forms in different environments? What makes a mineral rare? What can minerals tell us about life? Can minerals go extinct?
Join Tellus Museum for a symposium to hear more: tellusmuseum.org/our-events/min…
#MineralMonday #GeoscienceTwitter
The answer this week is sapphire, a variety of corundum. This is a star sapphire, with small inclusions that cause the light to reflect in a star shape. #GuessTheGem #GeoscienceTwitter
The answer is chalcedony, which is microcrystalline quartz with some moganite. The shield shape of the gem is unusual. #GuessTheGem #GeoscienceTwitter
Learn more about quartz with this online talk! Have you seen cotterite before? #GeoscienceTwitter
Do I know anyone who is teaching or attending a virtual or non-traditional #Geology #FieldCamp this summer?
I've got a blog/informal writing thing I'm thinking about & would love some input/writers!
#Geoscience Twitter #Geoscience
( #Archaeology welcome, too)
I have more codes for the other place. DM me if you want them! It's getting more and more active and so far it's been a great replacement for #GeoscienceTwitter