Jasper Gemstone & Information | Gemopedia by JTV | Gemopedia™

Jasper

Jasper is an opaque, fine grained variety of chalcedony quartz. It is typically found in red, yellow, brown or green colors and is generally spotted with these colors. Its name comes from the Latin word for the gem, iaspis, meaning "spotted stone."

Colors

Almost Any Color Except Black

  • Jasper classification

    CommonName
    Jasper
    Species
    Quartz
    Variety
    Chalcedony
    Colors
    Almost Any Color Except Black
    AlternateNames
    Agate Jasper, Banded Jasper, Basanite, Egyptian Jasper, Hornstone, Nunkirchner Jasper, Scenic Jasper, Silex
    GemstoneGroups
    KeySeparations
    RI, SG, appearance and fracture; color filter reaction if dyed.
    ClassificationComments
    Can be any color or variety of colors except black or colors covered by other varieties. The opaque version of chalcedony. Misnomer: dyed blue jasper Swiss lapis or German lapisJasper is the opaque cryptocrystalline form of quartz (chalcedony) and are basically silica cement. Egyptian jasper: strongly yellow and red.Hornstone or chert: fine grained gray, brown-red and rarely green or black.Scenic jasper: iron oxide staining makes designs that give the appearance of landscapes.Silex: Yellow and brown-red spotted or striped. Brecciated Jasper: show cracks because they were broken by tectonic movement and then cemented back together.Orbicular Jasper: (Ocean or Poppy) show sphere or flower-like patters. Scenic Jasper: have a landscape like appearance.
  • Jasper chemistry & crystallography

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

    Transparency
    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
    Dyed blue: pinkish
    Pleochroism
    None
  • Jasper characteristic physical properties

    Hardness
    6.5-7
    CharacteristicComments
    Streak
    White, Yellow, Brown And Red
    SpecificGravity
    2.5-2.6 Typical:2.6
    Toughness
    Excellent
    Inclusions
    Jasper is sometimes dyed often to look like lapis but will not have calcite or pyrite inclusions with higher luster. The stone will have a finely grained structure.
    Luster
    Vitreous
    Stability
    Good
    Fracture
    Conchoidal, Granular
    Cleavage
    None