Minerals identify

Know how to recognize them

Orthoclase

Silicate mineral

Orthoclase, or orthoclase feldspar (endmember formula K 8), is an important tectosilicate which forms igneous rock. The name is from the Ancient Greek for "straight fracture," because its two cleavage planes are at right angles to each other. It is a type of potassium feldspar, also known as K-feldspar. The gem known as moonstone (see below) is largely composed of orthoclase.

Identification

Color of mineral

Green
Grey
Yellow
White
Pink

Mohs scale ( mineral hardness )

6

The streak

White

Density ( specific gravity )

1.518
1.522
1.522

Luster ( interacts light )

Vitreous
Pearly

Crystal ( diaphaneity )

Monoclinic