Beryl var. Aquamarine : Be_3 Al_2 (SiO_3)_6 + Fe^{3+} Fe^{2+} ions
Blue crystals
Crystal: Hexagonal
Albite : Na Al Si_3 O_8
pale yellow
Crystal: Triclinic Pinacoidal
Biotite : K (Mg, Fe)_3 (Al Si_3 O_10) (F, OH)_2
Black flakes
Crystal: Monoclinic
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