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Rhodonite

Rhodonite

By Tim Matthews, JD, FGA, GG, DGA,
CEO and President of JTV (retired)
Published: June 2014
Modified: August 2022
Rhodonite Polished Rhodonite Rough Rhodonite Jewelry
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Table of Contents
  • General Information
  • Rhodonite Colors
  • Alternate Names
  • Countries of Origin
  • Care
  • Species/Variety

Rhodonite is an attractive mineral that is primarily known as an ornamental stone but is often seen in jewelry in the form of beads or cabochons. This mineral easily falls into the category of rare and exotic, making it highly prized by collectors of specimens and gemstones. Its name, derived from two Greek roots, means "rose-colored stone." Rhodonite, which is commonly found in massive or granular forms, is most often translucent to opaque in appearance. On rare occasion, transparent, gem-quality material may be found. Rhodonite's natural color ranges from pink to rose red to brownish red, often with blackish veins throughout.

General Information

  • Classification
  • Optical Properties
  • Characteristic Physical Properties
  • Chemistry & Crystallography
Common Name
Rhodonite
Species
Rhodonite
Transparency
Translucent - Opaque
Dispersion
Strength: None
Refractive Index
1.711-1.757 Tolerance: (+0.010/-0.013)
Birefringence
0.010- 0.014
Optic Character
Biaxial
Optic Sign
Positive
Polariscope Reaction
Aggregate (AGG), Doubly Refractive (DR)
Fluorescence
SWUV: Inert
LWUV: Inert
Pleochroism
Unobservable, distinct yellowish-red, pinkish-red, yellowish-red
Hardness
5.5-6.5
Streak
White
Specific Gravity
3.300-3.760 Typical:3.500
Toughness
Good
Inclusions
Rhodonite might have black, white or metallic veins or spots of manganese oxide.
Luster
Vitreous, Pearly, Dull, Subvitreous
Fracture
Conchoidal, Granular, Uneven
Cleavage
Perfect, in two directions
Chemical Name
manganese iron magnesium calcium silicate
Chemical Formula
(Mn, Fe, Mg, Ca) SiO3
Crystal System
Triclinic
Chemistry Classification
Silicate

Rhodonite Colors

  • Pink Rhodonite
    Pink
  • Red Rhodonite
    Red

Alternate Names

Manganese Gravel, Fowlerite

Countries of Origin

Canada; Russian Federation; Sweden; Unknown; China; United States of America; Brazil; Mexico; South Africa; Madagascar; Australia; Peru

Care

Normal, gentle handling on untreated stones.

Species/Variety

Rhodonite (single crystal)

Faceted grade Rhodonite is transparent to translucent and has a vitreous polish luster. It has a pearly luster on cleavage planes. Care must be taken when cutting rhodonite because it exhibits perfect cleavage in two directions. The Brazilian material can produce cat’s-eyes along with transparent gemstones, some of which can exceed 5 carats. Other known locations for gem quality crystals are Australia, Peru, Sweden, and the United States.

Rhodonite (single crystal) Rhodonite
Rhodonite (single crystal) Rhodonite
  • Classification
  • Optical Properties
  • Characteristic Physical properties
Common Name
Rhodonite (single crystal)
CCF Reaction
None
Pleochroism
Dichroic, weak to moderate orangy red and brownish red
Specific Gravity
3.30
Toughness
Poor
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