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garnets
Corundum is not particularly rare as large quantities are mined to make abrasives.
Lepidolite is mostly used for decoration and for mineral collections.
The mineral would either cleave on planes of weakness, or fracture.
mechanical
Gems
garnets
aluminum
Abrasives are found in the plaster of Paris.
Garnet
Diamond is used for gemstones, abrasives, and saw blades.
Sardonyx is an onyx mineral that is brownish and sard. The minerals or rock forms are made into stones and Gems and used for jewelry, decoration and many other ways.
Corundum is not particularly rare as large quantities are mined to make abrasives.
Mechanical.
Lepidolite is mostly used for decoration and for mineral collections.
The mineral would either cleave on planes of weakness, or fracture.
it can be used as jewelry and as a vehicle color