how to distinguish between physical properties of calcite/ feldspar, pyroxene/feldspar?

Answer 1

Calcite has rhombohedral cleavage, a hardness of 3 and fizzes in in HCl.

Feldspar has elongated cleavage, orthoclase (K-feldspar) is typically pink, plagioclase has striations on its surface and it typically white/grey.

Pyroxene has elongated cleavage at 88 and 92 degree angles. Its typically greener than amphiboles.

vvvvv Pyroxene is a mineral. Not a rock. It can be found in both igneous and metamorphic rocks.vvvvv

Answer 2

Physical Properties Of Calcite

Answer 3

pyroxene is generally a very dark metamorphoc rock.
calcite is usually clear of white-ish, and is known for it's ability to react to acids with a fizz (like an Tums)
There are two different kinds of feldspar. I can only think of potassium feldspar off the top of my head. one is generally pinkish, and the other is kinda orange-y.

I know that was very vague, but i hope i helped a bit...

Answer 4

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