Mineralogy Database

Molybdofornacite Mineral Data

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General Molybdofornacite Information

Help on Chemical  Formula: Chemical Formula: Pb2Cu[(As,P)O4][(Mo,Cr)O4](OH)
Help on Composition: Composition: Molecular Weight = 790.12 gm
   Chromium     1.32 %  Cr    2.53 % CrO3
   Copper       8.04 %  Cu    9.05 % Cu2O
   Molybdenum   9.71 %  Mo   14.57 % MoO3
   Arsenic      8.53 %  As   13.09 % As2O5
   Phosphorus   0.78 %  P     1.80 % P2O5
   Hydrogen     0.13 %  H     1.14 % H2O
   Lead        52.45 %  Pb   56.50 % PbO
   Oxygen      19.03 %  O
              ______        ______ 
              100.00 %       98.68 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb2Cu(AsO4)0.9(PO4)0.2MoO40.8CrO40.2(OH)
Help on Environment: Environment: Deep oxidation zone of a dolostone-hosted hydrothermal polymetallic ore deposit.
Help on IMA Status: IMA Status: Approved IMA 1983
Help on Locality: Locality: Tsumeb, Namibia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its predominance of molybdenum and relation to fornacite.
Help on Name Pronunciation: Name Pronunciation: Molybdofornacite + Pronunciation Say MOLYBDOFORNACITE

Molybdofornacite Image

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Comments: Lime green, tabular crystals of molybdofornacite on matrix.
Location: Mahoney district, Tres Hermanas Mountains, Luna County, New Mexico, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Molybdofornacite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.3622:1:2.9683
Help on Cell Dimensions: Cell Dimensions: a = 8.1, b = 5.946, c = 17.65, Z = 4; beta = 108.17° V = 807.68 Den(Calc)= 6.50
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.32(1), 2.845(0.6), 2.979(0.6),

Physical Properties of Molybdofornacite

Help on Cleavage: Cleavage: None
Help on Color: Color: Light green.
Help on Density: Density: 6.6
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.
Help on Habit: Habit: Pistolitic - > 3mm rounded spherical grains.
Help on Hardness: Hardness: 2-3 - Gypsum-Calcite
Help on Luster: Luster: Adamantine
Help on Streak: Streak: yellow

Optical Properties of Molybdofornacite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1692,KPDmeas= 0.1667,KC= 0.1677
Ncalc = 2.09 - 2.11
Help on Optical Data: Optical Data: Biaxial (+), a=2.05, g=2.15, bire=0.1000
Help on Pleochroism (x): Pleochroism (x): pale yellow.
Help on Pleochroism (y): Pleochroism (y): pale yellow.
Help on Pleochroism (z): Pleochroism (z): yellowish green.

Calculated Properties of Molybdofornacite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.69 gm/cc
note: Specific Gravity of Molybdofornacite =6.60 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.14
Boson Index = 0.86
Help on Photoelectric: Photoelectric: PEMolybdofornacite = 962.65 barns/electron
U=PEMolybdofornacite x rElectron Density=5,472.81 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Molybdofornacite is Not Radioactive

Molybdofornacite Classification

Help on  Dana Class: Dana Class: (43)Compound Phosphates, etc.
  (43.04)(Anhydrous Compound Anions With Hydroxyl or Halogen)
  (43.04.03)Vauquelinite Group Vauquelinite Pb2Cu(CrO4)(PO4)(OH) P 21/n 2/m Fornacite Pb2Cu(CrO4)(AsO4)(OH) P 21/c 2/m Molybdofornacite Pb2Cu[(As,P)O4][(Mo,Cr)O4](OH) P 21/c 2/m
Help on  Strunz Class: Strunz Class: 07.FC.10 07 - SULFATES (SELENATES, TELLURATES)
  07.F - Chromates
  07.FC -With PO4, AsO4, SiO4
07.FC.10 Fornacite Pb2Cu(CrO4)(AsO4)(OH) P 21/c 2/m
07.FC.10 Molybdofornacite Pb2Cu[(As,P)O4][(Mo,Cr)O4](OH) P 21/c 2/m

Other Molybdofornacite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)
Help on See Also: See Also: Links to other databases for Molybdofornacite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 07.FC.10





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