Triangular silicates {phyllosilicate} can have flat layers.
K2(Mg,Fe,Al)4-6(Si,Al)8O20(OH)4 [2, 4, 6, 8, and 20 are subscripts] {biotite} {black mica} is phyllosilicate and is lustrous and lamellar.
Chlorine-containing phyllosilicates {chlorite} are lamellar and dark green or blue-green.
KAl3Si3O10(OH)2 [3 and 10 are subscripts] {white mica} {mica}| is phyllosilicate and is pearly and lamellar. Aluminum silicates form at 900 C to 1400 C. They have density 2.6 g/cm^3 to 3.5 g/cm^3. Aluminum-silicate compounds include feldspar, hornblende, and biotite. Aluminum silicates with minerals are clays.
Mg3Si2O5(OH)4 [3, 2, 5, and 4 are subscripts] {serpentine, mineral}|, from Alps and Apennines, is phyllosilicate and can be chrysolite, asbestos serpentine, and antigonite.
Mg3Si4O10(OH)2 [3, 4, and 10 are subscripts] {talc}| is phyllosilicate and is white or gray, greasy, and monoclinic.
Talc can form stone {soapstone}|.
5-Earth Science-Mineral-Kinds-Silicates
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Date Modified: 2022.0225