Gottlobite Mineral Data

General Gottlobite Information

Chemical Formula:

CaMg(VO4,AsO4)(OH)

Composition:

Molecular Weight = 205.20 gm

Calcium 19.53 % Ca 27.33 % CaO

Magnesium 11.84 % Mg 19.64 % MgO

Vanadium 15.64 % V 27.92 % V₂O₅

Arsenic 13.51 % As 20.72 % As₂O₅

Hydrogen 0.49 % H 4.39 % H₂O

Oxygen 38.98 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaMg(VO₄)_0.63(AsO₄)_0.37(OH)

Environment:

In dump material of hydrothermal barite veins in Fe-Mn ore. A member of the descloizite group

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Long abandoned Glucksstern Mine at Gottlob hill, Friedrichroda, Thuringia, Germany. Link to MinDat.org Location Data.

Name Origin:

Named after the locality.

Synonym:

IMA1998-066

Gottlobite Image

Images:

Gottlobite

Comments: Orange-brownish tabular crystals of gottlobite with black hausmannite and colorless barite.
Location: Glücksstern Mine, Gottlob Hill, Friedrichroda, Thuringian Forest, Thuringia, Germany. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Gottlobite Crystallography

Axial Ratios:

a:b:c =0.8325:1:0.6593

Cell Dimensions:

a = 7.501, b = 9.01, c = 5.941, Z = 4; V = 401.52 Den(Calc)= 3.39

Crystal System:

Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: P 2₁2₁2₁

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

By Intensity(I/I_o): 3.17(1), 4.496(0.72), 1.614(0.41),4.139(0.32), 2.523(0.3), 2.785(0.3), 2.639(0.27), 2.596(0.21), 1.733(0.2),

Physical Properties of Gottlobite

Cleavage:

None

Color:

Orange, Brown orange.

Density:

3.41 - 3.58, Average = 3.49

Diaphaneity:

Transparent

Fracture:

Conchoidal - Irregular - Irregular fracture producing small, conchoidal fragments.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous - Adamantine

Streak:

light brown

Optical Properties of Gottlobite

Gladstone-Dale:

CI meas= 0.033 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2394,KPDmeas= 0.2322,KC= 0.2401
Ncalc = 1.81 - 1.86

Optical Data:

Biaxial (?), a=1.797, b=1.805-1.815, g=1.828, bire=0.0310, 2V(Calc)=62-80, 2V(Meas)=very large. Dispersion r > v medium.

Calculated Properties of Gottlobite

Electron Density:

Bulk Density (Electron Density)=3.29 gm/cc
note: Specific Gravity of Gottlobite =3.39 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Gottlobite= 14.70 barns/electron
U=PE_Gottlobite x rElectron Density= 48.42 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gottlobite is Not Radioactive

Gottlobite Classification

Dana Class:

41.05.01.10 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.05)where (A B)2 (XO4) Zq

(41.05.01)Adelite Group

41.05.01.01 Adelite CaMg(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.05.01.02 Conichalcite CaCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.05.01.03 Austinite CaZn(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.05.01.04 Duftite-beta? PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.05.01.05 Gabrielsonite PbFe(AsO4)(OH) P 2₁m mm2

41.05.01.06 Tangeite CaCu(VO4)(OH) P 2₁2₁2₁ 2 2 2

41.05.01.07 Nickelaustinite Ca(Ni,Zn)(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.05.01.08 Cobaltaustinite CaCo(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.05.01.09 Arsendescloizite PbZn(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.05.01.10 Gottlobite! CaMg(VO4,AsO4)(OH) P 2₁2₁2₁ 2 2 2

Strunz Class:

08.BH.35 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BH -With medium-sized and large cations, (OH,etc.):RO4 = 1:1

08.BH.35 Austinite CaZn(AsO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Adelite CaMg(AsO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Arsendescloizite PbZn(AsO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Duftite-alpha PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Duftite-beta? PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Cobaltaustinite CaCo(AsO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Conichalcite CaCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Gabrielsonite PbFe(AsO4)(OH) P 2₁m mm2

08.BH.35 Nickelaustinite Ca(Ni,Zn)(AsO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Tangeite CaCu(VO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Gottlobite! CaMg(VO4,AsO4)(OH) P 2₁2₁2₁ 2 2 2

Other Gottlobite Information

References:

NAME( AmMin, vol 86, p 767) PHYS. PROP.(AmMin, vol 86, p 767) OPTIC PROP.(AmMin, vol 86, p 767)

See Also:

Links to other databases for Gottlobite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Gottlobite

CaMg(VO4,AsO4)(OH)
Dana No: 41.05.01.10 Strunz No: 08.BH.35
Locality:

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