Lava Rock (Scoria) | Gemopedia

Also known as scoria, lava rock is formed from solidified volcanic lava. A defining feature of this rock is cavities caused by trapped gas bubbles. Unlike pumice, however, lava rock does not float on water. The unique look of this highly porous rock, along with its relatively light weight, makes it popular for jewelry and ornamental carvings.
Alternate
Names
Scoria
Colors
Black, Dark Gray, Deep Reddish Brown

Lava Rock (Scoria) Classification

Common Name

Lava Rock (Scoria)

Species

NA

Variety

Colors

Black, Dark Gray, Deep Reddish Brown

Alternate Names

Scoria

Gemstone Groups

Key Separations

Appearance and SG

Comments

Scoria is an igneous rock that is formed from solidified lava. The cavities are caused by trapped gas bubbles. Scoria can be separated from pumice because it will sink in water because it has an SG greater than 1.

Lava Rock (Scoria) Optical Properties

Transparency

Opaque

Refractive Index

Birefringence

Optic Character

NA

Optic Sign

Polariscope Reaction

Fluorescence

SWUV:
LWUV:

CCF Reaction

Pleochroism

None

Dispersion

Strength: none

Comments

Lava Rock (Scoria) Chemistry & Crystallography

Chemical Name

Chemical Formula

Synthesis

Crystal System

NA

Classification

Rock

Nature

Natural

Crystallinity

Aggregate

Comments

Lava Rock (Scoria) Characteristic Physical Properties

Hardness

Streak

Specific Gravity

Toughness

Inclusions

Lava rock or scoria will have rounded or elongated cavities.

Luster

Vitreous

Stability

Fracture

Cleavage

None

Comments

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