Rhodochrosite (banded) Gemstone & Information | Gemopedia by JTV | Gemopedia™

Rhodochrosite (banded)

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.

Colors

Red, Pink, Pinkish Orange To Deep Red, Orangy Pink, Brownish Red With White Banding

  • Rhodochrosite-banded classification

    CommonName
    Rhodochrosite (banded)
    Species
    Rhodochrosite
    Variety
    Colors
    Red, Pink, Pinkish Orange To Deep Red, Orangy Pink, Brownish Red With White Banding
    AlternateNames
    GemstoneGroups
    KeySeparations
    RI, birefringence, appearance and spectrum. Use birefringence blink method.
    ClassificationComments
    SG sometimes 3.60.
  • Rhodochrosite-banded chemistry & crystallography

    ChemicalName
    manganese carbonate
    ChemicalFormula
    MnCO3
    Synthesis
    CrystalSystem
    Trigonal
    ChemistryClassification
    Carbonate
    Nature
    Natural
    Crystallinity
    Aggregate
    ChemistryComments
  • Rhodochrosite-banded optical properties

    Transparency
    Translucent - Opaque
    Dispersion
    OpticalComments
    RefractiveIndex
    Over The Limit 1.597-1.817
    Tolerance:(+0.003/-0.003)
    Birefringence
    0.22
    OpticCharacter
    Uniaxial
    OpticSign
    Negative
    PolariscopeReaction
    Aggregate (AGG)
    Fluorescence
    SWUV: Inert to weak pink
    LWUV: Inert to moderate pink
    CCFReaction
    Pleochroism
    None
  • Rhodochrosite-banded characteristic physical properties

    Hardness
    3.5-4.5
    CharacteristicComments
    Streak
    White
    SpecificGravity
    3.45-3.7 Typical:3.7
    Toughness
    Poor
    Inclusions
    Rhodochrosite has agate like "bacon strip" banding and might show a poor polish.
    Luster
    Vitreous
    Stability
    Fracture
    Granular, Uneven
    Cleavage
    Perfect, in one direction