Petrified Wood | Gemopedia

Petrified wood is the fossilized remains of what once was wood. The material became petrified over time by the invasion of minerals into cavities between and within the cells of natural wood. Instead of decaying, the organic materials in the wood were replaced with minerals, primarily silicate of quartz, without changing the original structure of the wood.
Alternate
Names
Agatized Wood Or Silicified Wood
Colors
Various Colors

Petrified Wood Classification

Common Name

Petrified Wood

Species

Quartz

Variety

Chalcedony

Colors

Various Colors

Alternate Names

Agatized Wood Or Silicified Wood

Gemstone Groups

Key Separations

RI, SG, appearance and fracture

Comments

Petrified wood can also be replaced with opal, coal, pyrite, calcite and others minerals.

Petrified Wood Optical Properties

Transparency

Translucent - Opaque

Refractive Index

1.535-1.539

Birefringence

0.004-0.004

Optic Character

Uniaxial

Optic Sign

Positive

Polariscope Reaction

Aggregate (AGG)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

None

Dispersion

Strength: none

Comments

Petrified Wood Chemistry & Crystallography

Chemical Name

silicon dioxide (aka silica)

Chemical Formula

SiO2

Synthesis

Crystal System

Trigonal

Classification

Silicate

Nature

Natural

Crystallinity

Polycrystalline

Comments

Petrified Wood Characteristic Physical Properties

Hardness

6.5-7

Streak

White

Specific Gravity

2.55-2.7 Typical:2.6

Toughness

Excellent

Inclusions

Petrified wood looks like a patterned jasper.

Luster

Vitreous

Stability

Good

Fracture

Conchoidal, Granular

Cleavage

None

Comments

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