Ankerite Mineral Data

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⁺_0.6Mg_0.3Mn²⁺_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).

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 - RhombohedralH-M Symbol ( 3) Space Group: R 3

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

By Intensity(I/I_o): 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 large pop-up is very compute intensive and may not work well with some computers.

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Reeder R J , Dollase W A , American Mineralogist , 74 (1989) p.1159-1167, Structural variation in the dolomite-ankerite solid-solution series: An X-ray,, Mossbauer, and TEM study, sample BM 1931-294

View Additional jPOWD Structure files for Ankerite
[1] [2] [3] [4] [5] [6] [7]

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

Diaphaniety:

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:

None.

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

Optical Data:

Uniaxial (-), e=1.51-1.55, w=1.69-1.75, bire=0.1800-0.2000.

Calculated Properties of Ankerite

Electron Density:

r_electron=3.01 gm/cc
note: r_Ankerite=3.05 gm/cc.

Fermion Index

Fermion Index = 0.00874
Boson Index = 0.99126

Photoelectric:

PE_Ankerite= 8.09 barns/electron
U=PE_Ankerite x r_electron= 24.33 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ankerite is Not Radioactive

Ankerite Classification

Dana Class:

14.2.1.2 (14)Anhydrous Carbonates

(14.2)with Compound Formula A+ B++ (CO3)2

(14.2.1)Dolomite Group (Trigonal: R3¯)

14.2.1.1 Dolomite CaMg(CO3)2 R 3 3

14.2.1.2 Ankerite Ca(Fe,Mg,Mn)(CO3)2 R 3 3

14.2.1.3 Kutnohorite Ca(Mn,Mg,Fe)(CO3)2 R 3 3

14.2.1.4 Minrecordite CaZn(CO3)2 R 3 3

Strunz Class:

V/B.03-20 V - Nitrates, Carbonates and Borates

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

V/B.03 - Dolomite group

V/B.03-10 Dolomite CaMg(CO3)2 R 3 3

V/B.03-20 Ankerite Ca(Fe,Mg,Mn)(CO3)2 R 3 3

V/B.03-30 Kutnohorite Ca(Mn,Mg,Fe)(CO3)2 R 3 3

V/B.03-40 Minrecordite CaZn(CO3)2 R 3 3

V/B.03-50 Norsethite BaMg(CO3)2 R 32 3 2

V/B.03-70 Huntite CaMg3(CO3)4 R 32 3 2

V/B.03-80 Benstonite (Ba,Sr)6(Ca,Mn)6Mg(CO3)13 R 3 3

Other Ankerite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Dana8) OPTIC PROP.(Mason68)

Search for Ankerite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Ankerite :

AA Mineral Specimens

B & L Fine Minerals

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

MineralsWeb Fine Minerals

The GeoZone

Wrights Rock Shop

Translate Ankerite Mineral Data :

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 Español

Print or Cut-and-Paste your Ankerite Specimen Label here :

Ankerite

Ca(Fe++,Mg,Mn)(CO3)2
Dana No: 14.2.1.2 Strunz No: V/B.03-20
Locality:

Notes: