Minerals identify

Know how to recognize them

Oligoclase

Plagioclase, tectosilicate,

Oligoclase is a rock-forming mineral belonging to the plagioclase In chemical composition and in its crystallographic and physical characters it is intermediate between albite Si (Ca The albite:anorthite molar ratio of oligoclase ranges from 90:10 to 70:30.

Oligoclase is a high sodium feldspar crystallizing in the triclinic is 6 to 6.5 and the specific gravity is 2.64 to 2.66. The refractive indices are: nα=1.533–1.543, nβ=1.537–1.548, and nγ=1.542–1.552. In color it is usually white, with shades of grey, green, or red.

Identification

Color of mineral

White
Grey
Green
Red

Mohs scale ( mineral hardness )

6

Density ( specific gravity )

1.533
1.537
1.542

Crystal ( diaphaneity )

Triclinic