Tag: tectosilicates
Hauynite thin section
For Rene Just Hauyn (1743-1822) French crystallographer and mineralogist.
Formula: Na3Ca(Si3Al3)O12(SO4)
System: Cubic (Isometric)
Color: Blue, white, grey
Lustre: Vitreous, Greasy
Hardness: 5½–6
Density: 2.44–2.5
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Relief: Low negative
Habit/Form:...