Mineralogy Database

Ankerite Mineral Data

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General Ankerite Information

Help on Chemical  Formula: Chemical Formula: Ca(Fe++,Mg,Mn)(CO3)2
Help on Composition: Composition: Molecular Weight = 206.39 gm
   Calcium    19.42 %  Ca   27.17 % CaO
   Magnesium   3.53 %  Mg    5.86 % MgO
   Manganese   2.66 %  Mn    3.44 % MnO
   Iron       16.24 %  Fe   20.89 % FeO
   Carbon     11.64 %  C    42.65 % CO2
   Oxygen     46.51 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaFe2+0.6Mg0.3Mn2+0.1(CO3)2
Help on Environment: Environment: Common in ore-bearing rocks as a rock forming mineral (gangue). High Fe species are found in iron ores.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1825
Help on Locality: Locality: Styrian Erzberg, Eisenerz, Styria, Austria Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the Styrian (Austrian) mineralogist, Mathias Joseph Anker (1771-1843).
Help on Name Pronunciation: Name Pronunciation: Ankerite Say ANKERITE
Help on Synonym: Synonym: Brown Spar
  ICSD 100417
  PDF 41-586

Ankerite Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image

  Ankerite   Sphalerite   Dickite

Comments: White, rhombohedral crystals of ankerite and dark gray, metallic sphalerite on beige dickite.
Location: Prego mine, Kladno, Czech Rebublic. Scale: Picture size 2 cm.
© Dave Barthelmy

Ankerite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:3.3472
Help on Cell Dimensions: Cell Dimensions: a = 4.83, c = 16.167, Z = 3; V = 326.63 Den(Calc)= 3.15
Help on Crystal System: Crystal System: Trigonal - Rhombohedral H-M Symbol ( 3) Space Group: R 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.899(1), 1.812(0.06), 2.199(0.06),
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: ( 1 0 1)

Warning: this java applet does not work in some browsers because of security restrictions.


Physical Properties of Ankerite

Help on Cleavage: Cleavage: {1011} Perfect, {1011} Perfect, {1011} Perfect
Help on Color: Color: Brown, Brownish yellow, Gray, Gray brown, White.
Help on Density: Density: 3 - 3.1, Average = 3.05
Help on Diaphaneity: Diaphaneity: Translucent to subtranslucent
Help on Fracture: Fracture: Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Help on Habit: Habit: Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Ankerite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.001 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.031 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1984,KPDmeas= 0.2049,KC= 0.2048
Ncalc = 1.61 - 1.65
Help on Optical Data: Optical Data: Uniaxial (-), e=1.51-1.55, w=1.69-1.75, bire=0.1800-0.2000.

Calculated Properties of Ankerite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.01 gm/cc
note: Specific Gravity of Ankerite =3.05 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0087404925
Boson Index = 0.9912595075
Help on Photoelectric: Photoelectric: PEAnkerite = 8.09 barns/electron
U=PEAnkerite x rElectron Density= 24.33 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ankerite is Not Radioactive

Ankerite Classification

Help on  Dana Class: Dana Class: (14)Anhydrous Carbonates
  (14.02)with Compound Formula A+ B++ (CO3)2
  (14.02.01)Dolomite Group (Trigonal: R-3) Dolomite CaMg(CO3)2 R 3 3 Ankerite Ca(Fe,Mg,Mn)(CO3)2 R 3 3 Kutnohorite Ca(Mn,Mg,Fe)(CO3)2 R 3 3 Minrecordite CaZn(CO3)2 R 3 3
Help on  Strunz Class: Strunz Class: 05.AB.10 05 - CARBONATES (NITRATES)
  05.A - Carbonates without additional anions, without H2O
  05.AB -Alkali-earth (and other M2+) carbonates
05.AB.10 Ankerite Ca(Fe,Mg,Mn)(CO3)2 R 3 3
05.AB.10 Dolomite CaMg(CO3)2 R 3 3
05.AB.10 Kutnohorite Ca(Mn,Mg,Fe)(CO3)2 R 3 3
05.AB.10 Minrecordite CaZn(CO3)2 R 3 3

Other Ankerite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Dana8) OPTIC PROP.(Mason68)
Help on See Also: See Also: Links to other databases for Ankerite :
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 - GeoScienceWorld
10 - Google Images
11 - Google Scholar
12 - Handbook of Mineralogy (MinSocAm)
13 - Handbook of Mineralogy (UofA)
14 - MinDAT
15 - Mineralienatlas (Deutsch)
16 - Online Mineral Museum
17 - QUT Mineral Atlas
18 - Ruff.Info
19 - Scandinavian mineral gallery
20 - University of Colorado - Mineral Structure Data
22 - theimage

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Dana No: Strunz No: 05.AB.10





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