Minerals containing the chemical element is a solution with aluminum oxide (Al2O3) 9 hardness according to Mohs's standard is a secondary strength with jewels from diamonds. Many types of stone are found in stone, especially stone often found as a Variant akni or secondary mineral (mineral accessory) in rocks such as limestone, marble, syenite crystalline nepheline rocks, gneiss, basalt rock, pegmatite, etc.
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