Tag: phyllosilicates
Glauconite thin section
From Greek for blue, because of its color.
Formula: (K,Na)(Mg,Fe2+,Fe3+)(Fe3+,Al)(Si,Al)4O10(OH)2
System: Monoclinic
Color: Blue-green
Lustre: Dull, Earthy
Hardness: 2
Density: 2.4–2.95
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Relief: Moderate positive
Habit/Form: Glauconite forms small pellets...