Dendritic Agate Gemstone & Information | Gemopedia by JTV | Gemopedia™

Dendritic Agate

This agate variety is termed "dendritic" due to its internal collection of dendrites. Dendrites are fern-like inclusions of iron, manganese, or other metallic oxides that create bold patterns within the gem. Typically, dendritic agates are cut into slabs to best exhibit nature's artwork. As you might guess, these pieces are one-of-a-kinds, as no two dendritic patterns are exactly the same.

Colors

Colorless, White, Whitish Gray With Green, Brown, Black Inclusions

  • Dendritic-agate classification

    CommonName
    Dendritic Agate
    Species
    Quartz
    Variety
    Chalcedony
    Colors
    Colorless, White, Whitish Gray With Green, Brown, Black Inclusions
    AlternateNames
    Mocha Stone, Scenic Agate
    GemstoneGroups
    KeySeparations
    RI, SG, appearance and structure
    ClassificationComments
  • Dendritic-agate chemistry & crystallography

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

    Transparency
    Transparent - Semitranslucent
    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
  • Dendritic-agate characteristic physical properties

    Hardness
    6.5-7
    CharacteristicComments
    Streak
    White
    SpecificGravity
    1.55-1.7 Typical:1.6
    Toughness
    Excellent
    Inclusions
    Dendritic inclusions are green, brown or black iron or manganese and look like branches.
    Luster
    Vitreous
    Stability
    Good
    Fracture
    Conchoidal
    Cleavage
    None