Discover and read the best of Twitter Threads about #malachite

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Today #MinCup2020 is a battle of the carbonates.

Reasons to vote #Calcite: Perfect cleavage

Reasons to vote #Malachite: Specimen CC3353 from Copper Crescent in D.R. Congo.

📷 Crystal Classics Side view of an extremely p...Alternate side view of an e...Top view of an extremely ph...Cut bottom view of an extre...
Q: Lick?
A: Sure, #malachite is safe but boring for a quick taste.

Q: Nibble!
A: Ehhhh, not such a great idea. It’s soft (3.5-4 vs teeth at 5) & copper isn’t exactly a healthy snack.

Q: 🍆?
A: Pls no. While #Calcite bubbles in acid, malachite slowly dissolved into green goop.
Q: PERFECT cleavage? Really?

A: If you SMASHY-SMASHY calcite, it breaks on planes of weakness (cleavage planes) into 6-sided polyhedrons with diamond-shaped faces with 78° & 102° angles.

See:
📷: ??? stolen from old textbooks I think??? Calcite Crystal broken into...Calcite crystal and hammer ...
Read 3 tweets
#Malachite is gorgeous & I adorn myself with it regularly, but you're really going to want to vote for ##Lonsdaleite.

It forms in meteor impacts.
...from unusual meteors.

It's named for a #WomenInSTEM.
...from Ireland.
...who worked prison reform.
...after being imprisoned.
Whichever mineral survives will face off against #Calcite in Round 2.

Both calcite & malachite do fun things with acid (bubble; dissolve) and are iconic basic minerals to identify during intro geo lab classes. It'd be a solid, decent thread.

But lonsdaleite is SO WEIRD.
I don’t have the bandwidth to do proper campaign thread until I make it past a few deadlines, but futureYou will appreciate it if you keep #Lonsdalelite in the running until Round 2.
Read 3 tweets

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