Satin Spar | Gemopedia

Satin spar is an adjective used when the fibrous habit of a mineral gives it a satin luster. The term satin spar has been used in the past to describe calcite and aragonite, however, it is currently accepted as one variety of the mineral gypsum, along with selenite and alabaster. In addition to its ornamental uses, gypsum is also a primary component in plaster and other building materials.
Colors
Colorless, White, Cream

Satin Spar Classification

Common Name

Satin Spar

Species

Gypsum

Variety

Satin Spar

Colors

Colorless, White, Cream

Alternate Names

Gemstone Groups

Key Separations

Appearance, RI and SG. Poor polished surface due to low mohs hardness.

Comments

Satin Spar Optical Properties

Transparency

Translucent

Refractive Index

1.52-1.529
Tolerance:(+0.001/-0.001)

Birefringence

0.009-0.01

Optic Character

Biaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert to weak brownish to greenish white
LWUV: Inert to weak brownish to greenish white

CCF Reaction

Pleochroism

None

Dispersion

Comments

Satin Spar Chemistry & Crystallography

Chemical Name

hydrous calcium sulfate

Chemical Formula

CaSO4- 2H2O

Synthesis

Crystal System

Monoclinic

Classification

Sulfate

Nature

Natural

Crystallinity

Crystalline

Comments

Satin Spar Characteristic Physical Properties

Hardness

1.5-2

Streak

White

Specific Gravity

2.25-2.35 Typical:2.3

Toughness

Poor

Inclusions

Satin spar is a white to cream fibrous gypsum with chatoyant effect.

Luster

Waxy

Stability

Fair

Fracture

Granular

Cleavage

None

Comments

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