Rocks and Minerals Question Marathon

[tornado guy]

Maybe marble. All white from calcite and dolomite

That looks very rough to be marble. But I suppose it could be.

[hexagonaria]

Maybe marble. All white from calcite and dolomite

That looks very rough to be marble. But I suppose it could be.

I agree. I thought it was chalk at first.

[tornado guy]

Limestone Oolite, filled with calcite?

[Allinea]

Nope, not any sort of Limestone, nor is it marble. Dang, was not expecting it to be this hard. Does the bottom inch not help anyone? Eh... must think of better clue.

[tornado guy]

Some type of light sandstone?

[Allinea]

Yup. Sandstone. Since it took awhile just to get the rock I'll just give the mineral to you: it's quartz-rich sandstone.

[tornado guy]

Identify this mineral and what other mineral gives it the color?

Anyone.......?

[aznluvsricemhm]

I am 99.9% sure I'm wrong.....the other .1% is my imagination ^_^

acicular fluorite with....fluorite? xD no clue whatsoever

*how do you hide your answer?

[quizbowl]

Uh (Click to Show Hidden Text)

I'm pretty sure that the crystal structure points to a gypsum, but I'm not sure what the coloration is from...copper?  I'm thinking that from Malachite....

[aznluvsricemhm]

OH! OH! I KNOW :D QUIZBOWL JUST GAVE ME AN IDEA :D (Click to Show Hidden Text)

...is the answer Green gypsum crystal with copper ion?