Lava Rock (Scoria) Gemstone & Information | Gemopedia by JTV | Gemopedia™
Also known as scoria, lava rock is formed from solidified volcanic lava. A defining feature of this rock is cavities caused by trapped gas bubbles. Unlike pumice, however, lava rock does not float on water. The unique look of this highly porous rock, along with its relatively light weight, makes it popular for jewelry and ornamental carvings.
Black, Dark Gray, Deep Reddish Brown
Lava-rock-scoria classificationCommonNameLava Rock (Scoria)SpeciesNAVarietyColorsBlack, Dark Gray, Deep Reddish BrownAlternateNamesScoriaGemstoneGroupsKeySeparationsAppearance and SGClassificationCommentsScoria is an igneous rock that is formed from solidified lava. The cavities are caused by trapped gas bubbles. Scoria can be separated from pumice because it will sink in water because it has an SG greater than 1.
Lava-rock-scoria chemistry & crystallographyChemicalNameChemicalFormulaSynthesisCrystalSystemNAChemistryClassificationRockNatureNaturalCrystallinityAggregateChemistryComments
Lava-rock-scoria optical propertiesTransparencyOpaqueDispersionStrength: noneOpticalCommentsRefractiveIndexBirefringenceOpticCharacterNAOpticSignPolariscopeReactionFluorescenceSWUV:
Lava-rock-scoria characteristic physical propertiesHardnessCharacteristicCommentsStreakSpecificGravityToughnessInclusionsLava rock or scoria will have rounded or elongated cavities.LusterVitreousStabilityFractureCleavageNone