Limestone | Gemopedia

Limestone is composed mainly of calcite and occurs in thick extensive, multiple layers. It is formed in shallow seas from a combination of calcium carbonate or the accumulation of shells and skeletons of calcareous marine organisms. Limestone is abundant and is very important commercially as it has a number of different uses as a building stone, cement and as a raw material in the glass manufacturing process. Limestone that is recrystallized under heat and pressure becomes marble.
Colors
White, Gray, Pink

Limestone Classification

Common Name

Limestone

Species

NA

Variety

Colors

White, Gray, Pink

Alternate Names

Gemstone Groups

Key Separations

Comments

Limestone is a sedimentary rock formed mostly from the skeletal remains of marine organisms. Due to impurities limestone can have a banded appearance. It is not uncommon for limestone to contain fossil material.

Limestone Optical Properties

Transparency

Opaque

Refractive Index

Birefringence

Optic Character

Optic Sign

Polariscope Reaction

Fluorescence

SWUV:
LWUV:

CCF Reaction

Pleochroism

None

Dispersion

Comments

Limestone Chemistry & Crystallography

Chemical Name

Chemical Formula

calcite, aragonite, dolomite, siderite, quartz and pyrite

Synthesis

Crystal System

NA

Classification

Rock

Nature

Natural

Crystallinity

Aggregate

Comments

Limestone Characteristic Physical Properties

Hardness

Streak

Specific Gravity

Toughness

Inclusions

Luster

Dull

Stability

Fracture

Cleavage

None

Comments

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