Microcline Feldspar | Gemopedia

Microcline is one of the most common feldspar minerals. It is used in ceramics and is in deep seated, felsic rocks like granite, granodiorite, and syenite. Blue-green specimens of microcline are called amazonstone or amazonite and are used in jewelry, generally cut into cabochons. Its name refers to the small incline seen in its crystal structure.
Colors
White, Light Orange To Pink

Microcline Feldspar Classification

Common Name

Microcline Feldspar

Species

Microcline

Variety

Colors

White, Light Orange To Pink

Alternate Names

Gemstone Groups

Feldspar

Key Separations

appearance, RI, magnification, SG, possible fluorescence

Comments

Green variety is amazonite

Microcline Feldspar Optical Properties

Transparency

Semitranslucent - Opaque

Refractive Index

1.522-1.53
Tolerance:(+0.004/-0.004)

Birefringence

0.008

Optic Character

Biaxial

Optic Sign

Negative

Polariscope Reaction

Fluorescence

SWUV: inert
LWUV: weak yellowish green

CCF Reaction

Pleochroism

Unobservable

Dispersion

Comments

Microcline Feldspar Chemistry & Crystallography

Chemical Name

potassium aluminum silicate

Chemical Formula

KAlSi3O8

Synthesis

Crystal System

Triclinic

Classification

Silicate

Nature

Natural

Crystallinity

Aggregate

Comments

Microcline Feldspar Characteristic Physical Properties

Hardness

6-6.5

Streak

White

Specific Gravity

2.54-2.58 Typical:2.56

Toughness

Poor

Inclusions

Mottled coloring with grid like white streaks or patterns caused by cleavage.

Luster

Vitreous

Stability

Fracture

Uneven, Splintery

Cleavage

Perfect, in two directions

Comments

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