Illite
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Illite, also called hydromica or hydromuscovite, is a group of closely related non-expanding clay minerals. Illite is a secondary mineral precipitate, and an example of a phyllosilicate, or layered alumino-silicate. Its structure is a 2:1 sandwich... Wikipedia
Category: Mica- phyllosilicates
Cleavage: Perfect
Color: Grey-white to silvery-white, greenish-gray
Crystal class: Prismatic (2/m); (same H-M symbol)
Crystal habit: Micaceous aggregates
Crystal system: Monoclinic
Dana classification: 71.02.02d.02
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