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Tuesday, 12 July 2016
Tourmaline var.Elbaite on Albite var.Cleavelandite
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
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