Magnesite Mineral Data + Say MAGNESITE

General Magnesite Information

Help on Chemical  Formula: Chemical Formula: MgCO3
Help on Composition: Composition: Molecular Weight = 84.31 gm
   Magnesium  28.83 %  Mg   47.80 % MgO
   Carbon     14.25 %  C    52.20 % CO2
   Oxygen     56.93 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg(CO3)
Help on Environment: Environment: Evaporite mineral in sedimentary rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1807
Help on Locality: Locality: Magnisía (Magnesia) Prefecture, Thessalia (Thessaly) Department, Greece Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its chemical composition.
Help on Synonym: Synonym: Bitter spar
  ICSD 80870
  PDF 8-479
 

Magnesite Image

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Magnesite

Comments: Magnesite crystal group. The crystals have rhombic habit. The largest on this specimen is 3.7 cm across.
Location: Brumado Mine, Bahia, Brazil. Scale: Photo by John Veevaert.
© John Veevaert

Magnesite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:3.27001
Help on Cell Dimensions: Cell Dimensions: a = 4.633, c = 15.15, Z = 6; V = 281.62 Den(Calc)= 2.98
Help on Crystal System: 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/Io): 2.742(1), 2.102(0.45), 1.7(0.35),
Help on Forms: Forms:

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Forms: [ 1 0 0] [ 1 1 0] [ 0 1 1] [ 0 0 1]

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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 Magnesite
[1] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [2] [20] [21] [22] [23] [24] [3] [4] [5] [6] [7] [8] [9]
 

Physical Properties of Magnesite

Help on Cleavage: Cleavage: [1011] Perfect, [1011] Perfect, [1011] Perfect
Help on Color: Color: Colorless, White, Grayish white, Yellowish white, Brownish white.
Help on Density: Density: 3
Help on Diaphaniety: Diaphaniety: Transparent to translucent to opaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Help on Habit: Habit: Massive - Fibrous - Distinctly fibrous fine-grained forms.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 4 - Fluorite
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Magnesite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.021 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2029,KPDmeas= 0.2015,KC= 0.2057
Help on Optical Data: Optical Data: Uniaxial (-), e=1.7, w=1.508-1.51, bire=0.1900-0.1920.
 

Calculated Properties of Magnesite

Help on Electron Density: Electron Density:

relectron=2.97 gm/cc
note: rMagnesite =2.98 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.03066
Boson Index = 0.96934
Help on Photoelectric: Photoelectric:

PEMagnesite = 0.83 barns/electron
U=PEMagnesite x relectron= 2.45 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Magnesite is Not Radioactive

 

Magnesite Classification

Help on  Dana Class: Dana Class: 14.1.1.2 (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
Help on  Strunz Class: Strunz Class: V/B.02-30 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 Magnesite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Magnesite :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 - Amethyst Galleries' Mineral Gallery 5 - Applied Mineralogy 6 -Athena 7 - Crocoite.com Mineral Locations 8 - EUROmin Project 9 - Glendale Community College 10 -Google Images 11 -Google Scholar 12 -Handbook of Mineralogy (UofA) 13 - HyperPhysics 14 -MinDAT 15 -MinMax(Deutsch) 16 -MinMax(English) 17 - Mineral and Gemstone Kingdom 18 -Mineralienatlas (Deutsch) 19 -QUT Mineral Atlas 20 - Scandinavian mineral gallery 21 -University of Colorado - Mineral Structure Data 22 - WWW-MINCRYST 23 -theimage 24 -École des Mines de Paris

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Magnesite

MgCO3
Dana No: 14.1.1.2 Strunz No: V/B.02-30
Locality:

 

Notes:

 

 
   
 
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