Minerals identify

Know how to recognize them

Siderophyllite

Silicate mineral

Siderophyllite is a rare member of the mica group of silicate minerals with formula KFe2+2Al(Al2Si2)O10(F,OH)2.

The mineral occurs in nepheline syenite pegmatites greisens and astrophyllite at Pikes Peak, Colorado. It is also found in the alkali pegmatites of Mont Saint-Hilaire

It was first described in 1880 for an occurrence near Pikes Peak , Colorado. The name derives from the Greek sideros, iron, and phyllon, leaf, in reference to its iron rich composition and perfect basal cleavage

Identification

Color of mineral

Green
Blue
Brown
Black

Mohs scale ( mineral hardness )

2.5

Density ( specific gravity )

1.582
1.625
1.625

Luster ( interacts light )

Dull
Vitreous

Crystal ( diaphaneity )

Monoclinic