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Rhodochrosite



Rhodochrosite

Rhodochrosite from Sweet Home Mine, Alma, Colorado, USA
General
CategoryMineral species
Chemical formulaMnCO3
Identification
Molecular Weight114.95 g/mol
ColorRed to pink, Brown to yellow, gray to white
Crystal habitMassive to well crystaline
Crystal systemTrigonal - Hexagonal Scalenohedral
Twinningon the {0112} uncommon
Cleavageon the [1011] perfect
Fractureuneven, conchoidal
Tenacitybrittle
Mohs Scale hardness3.5-4
LusterVitreous
Optical PropertiesUniaxial (-)
Birefringenceδ = 0.218
Pleochroismweak
Ultraviolet fluorescenceNone
StreakWhite
Density3.7 g/cm³
DiaphaneityTransparent to translucent
References[1] [2]

  Rhodochrosite is a manganese carbonate mineral with chemical composition MnCO3. In its (rare) pure form, it is typically a rose-red color, but impure specimens can be shades of pink to pale brown. The streak is white. Its Mohs hardness varies between 3.5 and 4. Its specific gravity is 3.5 to 3.7. It crystallizes in the trigonal system. The cleavage is typical rhombohedral carbonate cleavage in three directions. Crystal twinning often is present. It is transparent to translucent with refractive indices of =1.814 to 1.816, =1.596 to 1.598. It is often confused with the manganese silicate, rhodonite, but is distinctly softer.

Additional recommended knowledge

Rhodochrosite forms a complete solid solution series with iron carbonate (siderite). Calcium, (as well as magnesium and zinc, to a limited extent) frequently substitutes for manganese in the structure, leading to lighter shades of red and pink, depending on the degree of substitution. It is for this reason that the most common color encountered is pink.

Rhodochrosite occurs as a hydrothermal vein mineral along with other manganese minerals in low temperature ore deposits as in the silver mines of Romania where it was first found. Banded rhodochrosite is mined in Capillitas, Argentina. Catamarca, Argentina has an old inca silver mine that has produced fine stalatitic examples of rhodochrosite that are unique and very attractive. Cut cross-sections reveal concentric bands of light and dark rose colored layers. These specimens are carved and used for many ornamental purposes.[3]

Its main use is as an ore of manganese which is a key component of low-cost stainless steel formulations and certain alluminium alloys. Quality banded specimens are often used for decorative stones and jewelry. Due to its being relatively soft, and having perfect cleaveage, it is very difficult to cut, and therefore rarely found faceted in jewelry.

It was first described in 1813 in reference to a sample from Cavnic, Maramureş, present-day Romania. The name is derived from the Greek word for rose-colored.

Colorado officially named rhodochrosite as its state mineral in 2002 based on a proposal by a local high school (Platte Canyon High School in Bailey,Colorado). The reason for this lies in the fact that while the mineral is found worldwide, large red crystals are found only in a few places on earth, and some of the best specimens have been found in the Sweet Home Mine near Alma, Colorado.  

The Incas believed that rhodochrosite is the blood of their former rulers, turned to stone, therefore it is sometimes called "Rosa del Inca" or "Inca Rose".[4][5]

Rhodochrosite and silver mining

Manganese carbonate is extremely destructive to the amalgamation process used in the concentration of silver ores, and so until quality mineral specimens became highly sought after by collectors, they were often discarded on the mine dump.

References

  • Hurlbut, Cornelius S.; Klein, Cornelis, 1985, Manual of Mineralogy, 20th ed., ISBN 0-471-80580-7
  • Mindat
  • Webmineral data
  • Mineral galleries
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Rhodochrosite". A list of authors is available in Wikipedia.
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