- "White mica." Nonferromagnesian
silicate mineral with tetrahedra arranged
in sheets. Sometimes called potassic mica.
Source: Leet, L. Don. 1982.
Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
- A monoclinic mineral, KAl2 (Si3 Al)O10 (OH,F)2;
mica group; pseudohexagonal; perfect basal cleavage; forms large,
transparent, strong, electrically and thermally insulating, stable sheets;
a common rock-forming mineral in silicic plutonic rocks, mica schists,
gneisses, and commercially in pegmatites; also a hydrothermal and
weathering product of feldspar and in detrital sediments. Also spelled:
moscovite. Syn: isinglass; white mica; potash mica; common mica;
Muscovy glass; mirror stone. Sericite is fine-grained muscovite, commonly
in connection with hydrothermal alteration, but sericite also includes
paragonite and illite. Illite is a common syn. for fine-grained muscovite
in clay mineralogy.
Dictionary of Mining, Mineral, and Related Terms