Amethest- a type of quartz with a purple coloring, traditionally the birthstone for February.
Olivine- made of silicate and Magnesium or Iron or both. Has an independent tetrahedron structure.
Hornblend- part of the Amphibole group. Found in granite.
Kaolinite- softer than chalk
Muscovite- a type of mica, has a sheet characteristic
Feldspar- There are two types of feldspar: Potassium and Plagioclase- another component of granite.
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