Petrified Wood Gemstone & Information | Gemopedia by JTV | Gemopedia™

Petrified Wood

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.

Colors

Various Colors

  • Petrified-wood classification

    CommonName
    Petrified Wood
    Species
    Quartz
    Variety
    Chalcedony
    Colors
    Various Colors
    AlternateNames
    Agatized Wood Or Silicified Wood
    GemstoneGroups
    KeySeparations
    RI, SG, appearance and fracture
    ClassificationComments
    Petrified wood can also be replaced with opal, coal, pyrite, calcite and others minerals.
  • Petrified-wood chemistry & crystallography

    ChemicalName
    silicon dioxide (aka silica)
    ChemicalFormula
    SiO2
    Synthesis
    CrystalSystem
    Trigonal
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Polycrystalline
    ChemistryComments
  • Petrified-wood optical properties

    Transparency
    Translucent - Opaque
    Dispersion
    Strength: none
    OpticalComments
    RefractiveIndex
    1.535-1.539
    Birefringence
    0.004-0.004
    OpticCharacter
    Uniaxial
    OpticSign
    Positive
    PolariscopeReaction
    Aggregate (AGG)
    Fluorescence
    SWUV: Inert
    LWUV: Inert
    CCFReaction
    Pleochroism
    None
  • Petrified-wood characteristic physical properties

    Hardness
    6.5-7
    CharacteristicComments
    Streak
    White
    SpecificGravity
    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