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apatite will not scratch quartz topaz calcite or corundum
Gypsum
bacially it has a hard harness.
apatite, cobalt, zirconium, palladium, tooth enamel, obsidian (volcanic glass)
Orthoclase comes in as 6 on Mohs scale of mineral hardness:- Talc, Gypsum, Calcite, Fluorite, Apatite, Orthoclase, Quartz, Topaz, Corundum, Diamond;
Somewhere between 3 and 5 on the Mohs scale of relative mineral hardness...
apatite
On the Mohs mineral hardness scale, calcite is about a 3, and apatite is about a 5. So, whatever is at a hardness of 4 will scratch a 3 but not a 5. That mineral is fluorite.
apatite will not scratch quartz topaz calcite or corundum
Quartz is harder than apatite, quartz being a 7 on the Mohs mineral hardness scale and apatite being a 5.
Gypsum
bacially it has a hard harness.
potassium feldspar
potassium feldspar
apatite with a steel knife feldspar with window glass
Yes Apatite is a mineral.
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