Gabbro | Gemopedia

Gabbro is a rock that is made up of calcium rich plagioclase feldspar and pyroxene, usually augite. Gabbros are found in a variety of locations, and have even been discovered on the moon. The colors of gabbro are typically dark gray to black with a medium to coarse texture and it is a favored medium in architectural designs.
Colors
Black, Green

Gabbro Classification

Common Name

Gabbro

Species

NA

Variety

Colors

Black, Green

Alternate Names

Gemstone Groups

Key Separations

Appearance

Comments

Gabbro is a igneous rock that is black or dark green in color. Gabbro is coarse grained and and chemically equivalent to basalt.

Gabbro Optical Properties

Transparency

Opaque

Refractive Index

Birefringence

Optic Character

NA

Optic Sign

NA

Polariscope Reaction

Fluorescence

SWUV:
LWUV:

CCF Reaction

Pleochroism

None

Dispersion

Comments

Gabbro Chemistry & Crystallography

Chemical Name

mixture of pyroxene, plagioclase, amphibole, olivine and rarely silica

Chemical Formula

Synthesis

Crystal System

NA

Classification

Rock

Nature

Natural

Crystallinity

Aggregate

Comments

Gabbro Characteristic Physical Properties

Hardness

Streak

Specific Gravity

Toughness

Inclusions

Coarse grained crystals that appear to be rod like in appearance.

Luster

Stability

Fracture

Cleavage

None

Comments

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