Ankerite Mineral Data
General Ankerite Information
Chemical Formula:
Ca(Fe++,Mg,Mn)(CO3)2
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
Empirical Formula:
CaFe2+ 0.6 Mg0.3 Mn2+ 0.1 (CO3 )2
Environment:
Common in ore-bearing rocks as a rock forming mineral (gangue). High Fe species are found in iron ores.
IMA Status:
Valid Species (Pre-IMA) 1825
Locality:
Styrian Erzberg, Eisenerz, Styria, Austria Link to MinDat.org Location Data.
Name Origin:
Named after the Styrian (Austrian) mineralogist, Mathias Joseph Anker (1771-1843).
Name Pronunciation:
Ankerite
Synonym:
Brown Spar
ICSD 100417
PDF 41-586
Ankerite Image
Images:
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
Axial Ratios:
a:c = 1:3.3472
Cell Dimensions:
a = 4.83, c = 16.167, Z = 3; V = 326.63 Den(Calc)= 3.15
Crystal System:
Trigonal - Rhombohedral H-M Symbol ( 3 ) Space Group: R 3
X Ray Diffraction:
By Intensity(I/Io ): 2.899(1), 1.812(0.06), 2.199(0.06),
Forms:
Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
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
Cleavage:
{1011} Perfect, {1011} Perfect, {1011} Perfect
Color:
Brown, Brownish yellow, Gray, Gray brown, White.
Density:
3 - 3.1, Average = 3.05
Diaphaneity:
Translucent to subtranslucent
Fracture:
Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Habit:
Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
Habit:
Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Habit:
Massive - Uniformly indistinguishable crystals forming large masses.
Hardness:
3.5-4 - Copper Penny-Fluorite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Ankerite
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
Optical Data:
Uniaxial (-), e=1.51-1.55, w=1.69-1.75, bire=0.1800-0.2000.
Calculated Properties of Ankerite
Electron Density:
Bulk Density (Electron Density)=3.01 gm/cc note: Specific Gravity of Ankerite =3.05 gm/cc.
Fermion Index:
Fermion Index = 0.0087404925 Boson Index = 0.9912595075
Photoelectric:
PEAnkerite = 8.09 barns/electronU=PEAnkerite x r Electron Density= 24.33 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Ankerite is Not Radioactive
Ankerite Classification
Dana Class:
14.02.01.02 (14) Anhydrous Carbonates
(14.02) with Compound Formula A+ B++ (CO3)2
(14.02.01) Dolomite Group (Trigonal: R-3)
14.02.01.01 Dolomite CaMg(CO3)2 R 3 3
14.02.01.02 Ankerite Ca(Fe,Mg,Mn)(CO3)2 R 3 3
14.02.01.03 Kutnohorite Ca(Mn,Mg,Fe)(CO3)2 R 3 3
14.02.01.04 Minrecordite CaZn(CO3)2 R 3 3
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
References:
NAME( Duda&Rejl90) PHYS. PROP.(Dana8) OPTIC PROP.(Mason68)
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
21 - WWW-MINCRYST
22 - theimage
Search for Ankerite using:
[AOL ]
[Bing ]
[Dog Pile ]
[GeoScienceWorld ]
[HotBot ]
[Ixquick ]
[Lycos ]
[MAMMA ]
[Scirus ]
[Teoma ]
[WebCrawler ]
[Wikipedia ]
[YAHOO ]
Visit our Advertisers for Ankerite :
Ask about Ankerite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in
Espa�ol
Print or Cut-and-Paste your Ankerite Specimen Label here :
Ankerite
Ca(Fe++,Mg,Mn)(CO3)2
Dana No: 14.02.01.02 Strunz No: 05.AB.10
Locality:
Notes:
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.