Hemimorphite Gemstone & Information | Gemopedia by JTV | Gemopedia™
Found in several worldwide locations that are often zinc-rich environments, most hemimorphite crystals are white to grayish white, yellowish or totally colorless. But when the robin's egg blue hues are found, miners know they have hit a pocket of true gem-quality material. Not only is fine quality hemimorphite geologically scarce, but there are few locations that have the right combination of trace minerals that create this stunning blue color. This gem is often appreciated as natural specimens due to its almost bubbly botryoidal crystal habit.
Blue, Bluish Gray ,Colorless, White, Gray, Yellow, Green, Pink, Purple, and Brown, sometimes Banded
Hemimorphite classificationCommonNameHemimorphiteSpeciesHemimorphiteVarietyColorsBlue, Bluish Gray ,Colorless, White, Gray, Yellow, Green, Pink, Purple, and Brown, sometimes BandedAlternateNamesCalamineGemstoneGroupsKeySeparationsSG, RI, birefringence, optic character and signClassificationComments
Hemimorphite chemistry & crystallographyChemicalNamehydrated zinc silicate hydroxideChemicalFormulaZn4Si2O7(OH)2.H2OSynthesisCrystalSystemOrthorhombicChemistryClassificationSilicateNatureNaturalCrystallinityCrystallineChemistryComments
Hemimorphite optical propertiesTransparencyTransparent - TranslucentDispersionStrength: moderate fire Value: 0.02OpticalCommentsRefractiveIndex1.614-1.636
Tolerance:(+0.003/-0.003)Birefringence0.022OpticCharacterBiaxialOpticSignPositivePolariscopeReactionDoubly Refractive (DR)FluorescenceSWUV: Inert
Hemimorphite characteristic physical propertiesHardness4.5-5CharacteristicCommentsStreakWhiteSpecificGravity3.3-3.5 Typical:3.45ToughnessPoorInclusionsLusterVitreousStabilityFractureUneven, SubconchoidalCleavagePerfect, in one direction, Good, in one direction