Gottlobite Mineral Data

Gottlobite Mineral Data

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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: Gl?cksstern 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 - DisphenoidalH-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),

Crystal Structure:

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Witzke T , Steins M , Doering T , Kolitsch U , Neues Jahrbuch fur Mineralogie, Monatshefte , 2000 (2000) p.444-454, Gottlobite, CaMg(VO4,AsO4)(OH), a new mineral from Friedrichroda, Thuringia, Germany, Locality: Glucksstern min, Gottlob hill, Friedrichroda, Thuringia, Germany

Physical Properties of Gottlobite

Cleavage:

None

Color:

Orange, Brown orange.

Density:

3.41 - 3.58, Average = 3.49

Diaphaniety:

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

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:

r_electron=3.29 gm/cc
note: r_Gottlobite=3.39 gm/cc.

Fermion Index

Fermion Index = 0.01268
Boson Index = 0.98732

Photoelectric:

PE_Gottlobite= 14.70 barns/electron
U=PE_Gottlobite x r_electron= 48.42 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gottlobite is Not Radioactive

Gottlobite Classification

Dana Class:

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

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

(41.5.1)Dana Group

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

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

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

41.5.1.4 Duftite-beta PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

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

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

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

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

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

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

Strunz Class:

VII/B.26-15 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.26 - Adelite - Duftite group

VII/B.26-10 Adelite CaMg(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-15 Gottlobite CaMg(VO4,AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-20 Nickelaustinite Ca(Ni,Zn)(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-30 Cobaltaustinite CaCo(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-40 Austinite CaZn(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-50 Conichalcite CaCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-60 Tangeite CaCu(VO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-70 Gabrielsonite PbFe(AsO4)(OH) P 2₁m mm2

VII/B.26-80 Duftite-alpha PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-80* Duftite-beta PbCu(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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Gottlobite

CaMg(VO4,AsO4)(OH)
Dana No: 41.5.1.10 Strunz No: VII/B.26-15
Locality:

Notes: