Mineralogy Database

Rhodochrosite Mineral Data

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General Rhodochrosite Information

Help on Chemical  Formula: Chemical Formula: MnCO3
Help on Composition: Composition: Molecular Weight = 114.95 gm
   Manganese  47.79 %  Mn   61.71 % MnO
   Carbon     10.45 %  C    38.29 % CO2
   Oxygen     41.76 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+(CO3)
Help on Environment: Environment: Commonly forms during oxidation of Mn-bearing ores in a carbonate environment.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1800
Help on Locality: Locality: Cavnic (Kapnik), Maramures, Romania Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek rhodon -"rose" and chroma - "color."
Help on Name Pronunciation: Name Pronunciation: Rhodochrosite + Pronunciation Say RHODOCHROSITE
Help on Synonym: Synonym: Dialogite
  ICSD 100677
  Manganese spar
  PDF 44-1472
  Parakutnohorite - intermediate composition between calcite and rhodochrosite

Rhodochrosite Image

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  Helvite   Rhodochrosite

Comments: Yellow crystals of helvite on quartz and pink rhodochrosite.
Location: Galerie Elisabeth, Cavnic, Maramures, Romaina. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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Comments: Cherry red rhodochrosite with quartz, tetrahedrite, chalcopyrite and fluorite matrix.
Location: Rivas Pocket, Fluorite Raise, Sweet Home mine, Alma, Colorado, USA. Scale: 8 x 8cm..
© Fabre Minerals

Rhodochrosite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:3.2803
Help on Cell Dimensions: Cell Dimensions: a = 4.777, c = 15.67, Z = 6; V = 309.68 Den(Calc)= 3.70
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.84(1), 1.763(0.35), 3.66(0.35),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 0 1 1) ( 2 1 0)

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Physical Properties of Rhodochrosite

Help on Cleavage: Cleavage: {1011} Perfect, {1011} Perfect, {1011} Perfect
Help on Color: Color: Pinkish red, Red, Rose red, Yellowish gray, Brown.
Help on Density: Density: 3.69
Help on Diaphaneity: Diaphaneity: Translucent to subtranslucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Botryoidal - "Grape-like" rounded forms (e.g.. malachite).
Help on Habit: Habit: Columnar - Forms columns
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 3 - Calcite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Rhodochrosite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.055 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.057 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1908,KPDmeas= 0.1913,KC= 0.2024
Ncalc = 1.75
Help on Optical Data: Optical Data: Uniaxial (-), e=1.596-1.598, w=1.814-1.816, bire=0.2180.

Calculated Properties of Rhodochrosite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.53 gm/cc
note: Specific Gravity of Rhodochrosite =3.69 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0013498377
Boson Index = 0.9986501623
Help on Photoelectric: Photoelectric: PERhodochrosite = 12.46 barns/electron
U=PERhodochrosite x rElectron Density= 44.00 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rhodochrosite is Not Radioactive

Rhodochrosite Classification

Help on  Dana Class: Dana Class: (14)Anhydrous Carbonates
  (14.01)with Simple Formula A+ CO3
  (14.01.01)Calcite Group (Trigonal: R-3c) Calcite CaCO3 R 3c 3 2/m Magnesite MgCO3 R 3c 3 2/m Siderite FeCO3 R 3c 3 2/m Rhodochrosite MnCO3 R 3c 3 2/m Sphaerocobaltite CoCO3 R 3c 3 2/m Smithsonite ZnCO3 R 3c 3 2/m Otavite CdCO3 R 3c 3 2/m Gaspeite (Ni,Mg,Fe)CO3 R 3c 3 2/m
Help on  Strunz Class: Strunz Class: 05.AB.05 05 - CARBONATES (NITRATES)
  05.A - Carbonates without additional anions, without H2O
  05.AB -Alkali-earth (and other M2+) carbonates
05.AB.05 Calcite CaCO3 R 3c 3 2/m
05.AB.05 Gaspeite (Ni,Mg,Fe)CO3 R 3c 3 2/m
05.AB.05 Magnesite MgCO3 R 3c 3 2/m
05.AB.05 Rhodochrosite MnCO3 R 3c 3 2/m
05.AB.05 Otavite CdCO3 R 3c 3 2/m
05.AB.05 Sphaerocobaltite CoCO3 R 3c 3 2/m
05.AB.05 Siderite FeCO3 R 3c 3 2/m
05.AB.05 Smithsonite ZnCO3 R 3c 3 2/m

Other Rhodochrosite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Mason68)
Help on See Also: See Also: Links to other databases for Rhodochrosite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - CalTech Mineral Spectroscopy
7 - EUROmin Project
8 - Ecole des Mines de Paris
9 - Franklin Minerals(Dunn)
10 - Franklin Minerals(Palache)
11 - GeoScienceWorld
12 - Google Images
13 - Google Scholar
14 - Handbook of Mineralogy (MinSocAm)
15 - Handbook of Mineralogy (UofA)
16 - HyperPhysics
17 - MinDAT
18 - Mineral and Gemstone Kingdom
19 - Mineral of the Month
20 - Mineralienatlas (Deutsch)
21 - Online Mineral Museum
22 - Philatelic Mineralogy
23 - QUT Mineral Atlas
24 - Ruff.Info
25 - Tradeshop.com - The Rainbow of Gems
26 - University of Colorado - Mineral Structure Data
28 - YupRocks
29 - theimage

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Dana No: Strunz No: 05.AB.05





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