Marble | Gemopedia

Marble is a granular metamorphic rock formed under the influence of heat and pressure, and consists of a mass of interlocking calcite or dolomite grains. Pure marble is white, and some other marbles take their common names from their color or mineral impurities. Marble is often used for fine building material or sculpture, thanks to its beautiful appearance.
Colors
Various

Marble Classification

Common Name

Marble

Species

NA

Variety

NA

Colors

Various

Alternate Names

Gemstone Groups

Key Separations

cleavage, refractive index, birefringence, strong doubling (if transparent), specific gravity. Use birefringence blink method.

Comments

Misnomers: Mexican jade. Type of limestone used for ornamental objects. Onyx marble if banded.

Marble Optical Properties

Transparency

Semitranslucent - Opaque

Refractive Index

1.486-1.658

Birefringence

0.172-0.172

Optic Character

NA

Optic Sign

Polariscope Reaction

Aggregate (AGG)

Fluorescence

SWUV: Variable
LWUV: Variable

CCF Reaction

Pleochroism

None

Dispersion

Comments

Marble Chemistry & Crystallography

Chemical Name

calcium carbonate

Chemical Formula

CaCO3

Synthesis

Crystal System

Trigonal

Classification

Carbonate

Nature

Natural

Crystallinity

Aggregate

Comments

Marble Characteristic Physical Properties

Hardness

3

Streak

Varies By Color

Specific Gravity

2.65-2.75 Typical:2.7

Toughness

Varies

Inclusions

Marble is often dyed.

Luster

Vitreous

Stability

Fair

Fracture

Uneven, Granular, Splintery

Cleavage

None

Comments

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