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| Glauconite | |
Chemical Formula |
(K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2 |
Species |
Silicates |
Crystal System |
Monoclinic |
Mohs Scale |
2 |
Specific Gravity |
2.4-2.95 |
Color |
Blue green, green, yellow green |
Streak |
Light green |
Luster |
Dull, Earthy |
Refractive Index |
n = 1.590 - 1.612 n = 1.609 - 1.643 n = 1.610 - 1.644 |
Diaphaneity |
Translucent, Opaque |
Cleavage |
PerfectPerfect on . |
Fracture |
Micaceous |
| Crystal Habit：Platy micaceous or rounded pellets | |
| Geological Setting：Formed in shallow marine environments that are mildly reducing when little or no sedimentation is taking place, hence found in shallow marine sedimentary rocks - limestones, siltstones, shales and sandstones. "Greensands" are named that because of their typically high glauconite content. | |
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