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Stock List Crystals & Substrates

Stock List Targets

Identifikation

Color

Pale yellow to brown

Crystal habit

Tabular crystals

Crystal system

Trigonal - Hexagonal scalenohedral (3 2/m)

Lattice constant

a_rh   = 6.03 Å     a`103 °, 05`
a_hex = 4.72 Å
c_hex = 15.46 Å

Twinning

Lamellar uncommon on {0112}

Cleavage

Perfect on {0111}

Mohs scale hardness

3.75 - 4.25

Diaphaneity

Translucent to subtranslucent

Specific gravity

3.96

Optical properteis

Uniaxial (-)

Refractive index

n_ಎ = 1.875
n_ԑ = 1.633

Birefringence

δ   = 0.242