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.

đź“· 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:
đź“·: ??? 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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