Jasper Gemstone & Information | Gemopedia by JTV | Gemopedia™
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."
Almost Any Color Except Black
Jasper classificationCommonNameJasperSpeciesQuartzVarietyChalcedonyColorsAlmost Any Color Except BlackAlternateNamesAgate Jasper, Banded Jasper, Basanite, Egyptian Jasper, Hornstone, Nunkirchner Jasper, Scenic Jasper, SilexGemstoneGroupsKeySeparationsRI, SG, appearance and fracture; color filter reaction if dyed.ClassificationCommentsCan 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 & crystallographyChemicalNamesilicon dioxide (aka silica)ChemicalFormulaSiO2SynthesisCrystalSystemTrigonalChemistryClassificationSilicateNatureNaturalCrystallinityPolycrystallineChemistryComments
Jasper optical propertiesTransparencyOpaqueDispersionStrength: noneOpticalCommentsRefractiveIndex1.535-1.539Birefringence0.004-0.004OpticCharacterUniaxialOpticSignPositivePolariscopeReactionAggregate (AGG)FluorescenceSWUV: Inert
LWUV: InertCCFReactionDyed blue: pinkishPleochroismNone
Jasper characteristic physical propertiesHardness6.5-7CharacteristicCommentsStreakWhite, Yellow, Brown And RedSpecificGravity2.5-2.6 Typical:2.6ToughnessExcellentInclusionsJasper 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.LusterVitreousStabilityGoodFractureConchoidal, GranularCleavageNone