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Rhodochrosite

Rhodochrosite

By Tim Matthews, JD, FGA, GG, DGA,
CEO and President of JTV (retired)
Published: June 2014
Modified: July 2023
Rhodochrosite Polished Rhodochrosite Rough Rhodochrosite Jewelry
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Table of Contents
  • General Information
  • Rhodochrosite Colors
  • Rhodochrosite Spectra
  • Alternate Names
  • Countries of Origin
  • Care
  • Species/Variety

Rhodochrosite gets its name from the Greek words rhodon, meaning rose and chros, meaning color. It comes in pink to red, orangy red, yellowish orange, and light to medium brown. Most people are familiar with the banded variety of Rhodochrosite that is used for decorative objects and is fashioned into cabochons for jewelry. This variety is known for its bacon-like appearance. Single crystal rhodochrosite is lesser known and highly sought after by collectors. This material is transparent to translucent and usually rhombohedral or rarely scalenohedral in form. The best-known locations for top quality specimens are the N’Chwaning Mines in South Africa and the Sweet Home Mine, near Alma, Colorado.

General Information

  • Classification
  • Optical Properties
  • Characteristic Physical Properties
  • Chemistry & Crystallography
Common Name
Rhodochrosite
Species
Rhodochrosite
Transparency
Translucent-Transparent
Dispersion
Strength: Weak Fire Value: 0.015
Refractive Index
Over The Limit 1.594-1.820 Tolerance: (+0.003/-0.003)
Birefringence
0.22
Optic Character
Uniaxial
Optic Sign
Negative
Polariscope Reaction
Aggregate (AGG), Doubly Refractive (DR)
Fluorescence
SWUV: Inert to weak red
LWUV: Inert to moderate red
CCF Reaction
None
Pleochroism
Dichroic, moderate to strong red to yellowish orange and orangy pink to brownish red
Hardness
3.5-4
Streak
White
Specific Gravity
3.400-3.710
Toughness
Poor
Inclusions
Rhodochrosite typically has many liquid and 2-phase inclusions.
Luster
Vitreous, Pearly, Subvitreous
Fracture
Uneven, conchoidal
Cleavage
Perfect, in one direction
Chemical Name
manganese carbonate
Chemical Formula
MnCO3
Crystal System
Trigonal
Chemistry Classification
Carbonate

Rhodochrosite Colors

  • Multi-color Rhodochrosite
    Multi-color
  • Orange Rhodochrosite
    Orange
  • Pink Rhodochrosite
    Pink
  • Red Rhodochrosite
    Red

Rhodochrosite Spectra

We acknowledge the significant scientific contributions of John S Harris, FGA to the study of gemstone spectra and with deep appreciation to him, acknowledges the use of his images and related notes about gemstones and their spectra in the educational materials on this website.

Alternate Names

Rosinca, Inca Rose

Countries of Origin

Tanzania, United Republic Of; Russian Federation; Czechia; United States of America; Kazakhstan; Thailand; United Kingdom of Great Britain and Northern Ireland; Portugal; Greece; Gabon; Austria; Sweden; Pakistan; Unknown; China; Ireland; Brazil; Slovakia; Bulgaria; Chile; France; Ecuador; Argentina; Romania; Hungary; Republic of Kosovo; Japan; Philippines; Ukraine; Bolivia (Plurinational State of); India; Spain; Canada; Belgium; Norway; Namibia; Italy; Mexico; South Africa; Australia; Peru; Germany

Care

Rhodochrosite is very soft, so be mindful of scratching or chipping. Soluble in hydrochloric acid. Requires gentle handling.

Species/Variety

Rhodochrosite (single crystal)

Clean, transparent, facetable material and mineral specimens are extremely rare and highly sought after by gem collectors. Faceting such crystals presents a challenge to cutters due to the gem's perfect cleavage in three directions. Two of the best know sources of translucent material come from N’Chwaning, South Africa and the Sweet Home Mine in Alma, Colorado, but it can also be found several African country’s Germany, southern Mexico, Peru, and Romania.

Rhodochrosite (single crystal) Rhodochrosite
Rhodochrosite (single crystal) Rhodochrosite
  • Classification
  • Optical Properties
  • Characteristic Physical properties
Common Name
Rhodochrosite (single crystal)
CCF Reaction
None
Specific Gravity
3.40
Toughness
Poor
Inclusions
Rhodochrosite typically has many liquid and 2-phase inclusions.
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