Rhodochrosite (banded) Gemstone & Information | Gemopedia by JTV | Gemopedia™
One of nature's more exotic treasures, rhodochrosite is a manganese carbonate that gets its name from two Greek words: "rhodon," meaning rose and "chros," meaning color. A fitting name indeed as its finest colors range from very pale pink, pale to deep orangey red. Yellow to brown crystals are also known. Clean, transparent, facetable material is extremely rare and highly sought after by gem collectors. Faceting such crystals present a challenge to cutters due to the gem's perfect cleavage in three directions. Semi-translucent to opaque rhodochrosite is often carved or cut en cabochon and typically displays "bacon strip" or "bull's eye" patterns.
Red, Pink, Pinkish Orange To Deep Red, Orangy Pink, Brownish Red With White Banding
Rhodochrosite-banded classificationCommonNameRhodochrosite (banded)SpeciesRhodochrositeVarietyColorsRed, Pink, Pinkish Orange To Deep Red, Orangy Pink, Brownish Red With White BandingAlternateNamesGemstoneGroupsKeySeparationsRI, birefringence, appearance and spectrum. Use birefringence blink method.ClassificationCommentsSG sometimes 3.60.
Rhodochrosite-banded chemistry & crystallographyChemicalNamemanganese carbonateChemicalFormulaMnCO3SynthesisCrystalSystemTrigonalChemistryClassificationCarbonateNatureNaturalCrystallinityAggregateChemistryComments
Rhodochrosite-banded optical propertiesTransparencyTranslucent - OpaqueDispersionOpticalCommentsRefractiveIndexOver The Limit 1.597-1.817
Tolerance:(+0.003/-0.003)Birefringence0.22OpticCharacterUniaxialOpticSignNegativePolariscopeReactionAggregate (AGG)FluorescenceSWUV: Inert to weak pink
LWUV: Inert to moderate pinkCCFReactionPleochroismNone
Rhodochrosite-banded characteristic physical propertiesHardness3.5-4.5CharacteristicCommentsStreakWhiteSpecificGravity3.45-3.7 Typical:3.7ToughnessPoorInclusionsRhodochrosite has agate like "bacon strip" banding and might show a poor polish.LusterVitreousStabilityFractureGranular, UnevenCleavagePerfect, in one direction