Rhodochrosite Mineral Data

Rhodochrosite Mineral Data +

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General Rhodochrosite Information

Chemical Formula:

MnCO3

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

Empirical Formula:

Mn²⁺(CO₃)

Environment:

Commonly forms during oxidation of Mn-bearing ores in a carbonate environment.

IMA Status:

Valid Species (Pre-IMA) 1800

Locality:

Cavnic (Kapnik), Maramures, Romania Link to MinDat.org Location Data.

Name Origin:

From the Greek rhodon -"rose" and chroma - "color."

Synonym:

Dialogite

ICSD 100677

Manganese spar

PDF 44-1472

Rhodochrosite Image

Images:

Click Here for Larger Rhodochrosite Image

Rhodochrosite Helvite

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

Images:

Rhodochrosite

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

Axial Ratios:

a:c = 1:3.2803

Cell Dimensions:

a = 4.777, c = 15.67, Z = 6; V = 309.68 Den(Calc)= 3.70

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.84(1), 1.763(0.35), 3.66(0.35),

Forms:

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Crystal Structure:

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Graf D L , American Mineralogist , 46 (1961) p.1283-1316, Crystallographic tables for the rhombohedral carbonates

View Additional jPOWD Structure files for Rhodochrosite
[1] [2]

Physical Properties of Rhodochrosite

Cleavage:

[1011] Perfect, [1011] Perfect, [1011] Perfect

Color:

Pinkish red, Red, Rose red, Yellowish gray, Brown.

Density:

3.69

Diaphaniety:

Translucent to subtranslucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Botryoidal - "Grape-like" rounded forms (e.g.. malachite).

Habit:

Columnar - Forms columns

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

3 - Calcite

Luminescence:

None.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Rhodochrosite

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

Optical Data:

Uniaxial (-), e=1.596-1.598, w=1.814-1.816, bire=0.2180.

Calculated Properties of Rhodochrosite

Electron Density:

r_electron=3.53 gm/cc
note: r_{Rhodochrosite}=3.69 gm/cc.

Fermion Index

Fermion Index = 0.00134
Boson Index = 0.99866

Photoelectric:

PE_{Rhodochrosite}= 12.46 barns/electron
U=PE_{Rhodochrosite} x r_electron= 44.00 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Rhodochrosite is Not Radioactive

Rhodochrosite Classification

Dana Class:

14.1.1.4 (14)Anhydrous Carbonates

(14.1)with Simple Formula A+ CO3

(14.1.1)Calcite Group (Trigonal: R3¯c)

14.1.1.1 Calcite CaCO3 R 3c 3 2/m

14.1.1.2 Magnesite MgCO3 R 3c 3 2/m

14.1.1.3 Siderite FeCO3 R 3c 3 2/m

14.1.1.4 Rhodochrosite MnCO3 R 3c 3 2/m

14.1.1.5 Sphaerocobaltite CoCO3 R 3c 3 2/m

14.1.1.6 Smithsonite ZnCO3 R 3c 3 2/m

14.1.1.7 Otavite CdCO3 R 3c 3 2/m

14.1.1.8 Gaspeite (Ni,Mg,Fe)CO3 R 3c 3 2/m

Strunz Class:

V/B.02-50 V - Nitrates, Carbonates and Borates

V/B - Waterfree carbonates [CO3]2- without unfamiliar anions

V/B.02 - Calcite group

V/B.02-10 Vaterite CaCO3 P 6₃/mmc 6/m 2/m 2/m

V/B.02-20 Calcite CaCO3 R 3c 3 2/m

V/B.02-30 Magnesite MgCO3 R 3c 3 2/m

V/B.02-40 Siderite FeCO3 R 3c 3 2/m

V/B.02-50 Rhodochrosite MnCO3 R 3c 3 2/m

V/B.02-60 Smithsonite ZnCO3 R 3c 3 2/m

V/B.02-70 Sphaerocobaltite CoCO3 R 3c 3 2/m

V/B.02-80 Gaspeite (Ni,Mg,Fe)CO3 R 3c 3 2/m

V/B.02-90 Otavite CdCO3 R 3c 3 2/m

Other Rhodochrosite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Mason68)

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Rhodochrosite

MnCO3
Dana No: 14.1.1.4 Strunz No: V/B.02-50
Locality:

Notes: