Minerals identify

Know how to recognize them

Annite

Phyllosilicates,mica group

Annite is a phyllosilicate family. It has a chemical formula of KFe32+AlSi3O10(OH)2. end member of the biotite rich phlogopite Annite is monoclinic and contains tabular crystals and cleavage fragments with pseudohexagonal outlines. There are contact twins

Annite was first described in 1868 for the first noted occurrence in Cape Ann, Essex County , El Paso County and metamorphic rocks that are deficient in magnesium and is associated with fluorite in the type locality

Identification

Color of mineral

Brown
Black

Mohs scale ( mineral hardness )

2.5

The streak

Brown
White

Density ( specific gravity )

1.625
1.69
1.691

Luster ( interacts light )

Metallic
Pearly
Submetallic
Vitreous

Crystal ( diaphaneity )

Monoclinic