Tuesday 12 July 2016

Tourmaline var.Elbaite : $Na (Li_{1.5} Al_{1.5} ) Al_6 Si_6 O_{18} (B O_3)_3 (O H)_4$

with impurity from Mn or Ti

Pink/Yellow crystal

Crystal: Trigonal

Albite var.Cleavelandite : $Na Al Si_3 O_8$

White/Pale Blue Matrix

Crystal: Triclinic Pinacoidal

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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