Flourite Crystal

question on rocks and minerals ?
1) which mineral is composed of calcium and flourine
a)amphiboles b)calcite c)hermatite 4)flourite
2)Sapphire is a gemstone variety in which mineral on Moh’s scale of hardness
a)corundum b)diamond c)flourite d)topaz
3)if the mass of a spinel crystal is 9.5 grams what is the volume of this spinal crystal
a)0.4 cm cubed b)2.5 cm cubed c)5.7 cm cubed d)36.1 cm cubed
if you could help me out with anyone or all of them that would be great
1. CaF2 is fluorite
2. corundum (rubies, too)
3. 2.5 cm^3 is closest. The avg density of spinel is 3.64 g/cm^3.
since density = mass/volume,
3.64 = 9.5/volume
volume = 9.5/3.64 = 2.61 cm^3
Fluorite Crystal Visual
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