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Illite
Type Locality
Maquoketa Shale, Gilead, Calhoun Co., Illinois, USA
Mineral Data
K
0.65
Al
2.0
[Al
0.65
Si
3.35
O
10
](OH)
2
Variety Of:
Muscovite
Physical Properties
Streak:
White
Hardness:
1.0 - 2.0
Tenacity:
elastic
