Molybdofornacite Mineral Data

Molybdofornacite Mineral Data +

[Newest Minerals] [Equipment] [Analytical Services] [About Us] [Mineral Gallery] [eBay Store]
See Also: [Diamond Crystals] [Mineral News] [Hudson Institute] [Minerals on CDROM]
Rare Minerals, Meteorites, Equipment and Analytical Services
Excalibur Mineral Company, World leaders in the supply of rare species
Serving the scientific and collector communities since 1974

General Molybdofornacite Information

Chemical Formula:

Pb2Cu[(As,P)O4][(Mo,Cr)O4](OH)

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

Empirical Formula:

Pb₂Cu(AsO₄)_0.9(PO₄)_0.2MoO₄_0.8CrO₄_0.2(OH)

Environment:

Deep oxidation zone of a dolostone-hosted hydrothermal polymetallic ore deposit.

IMA Status:

Approved IMA 1983

Locality:

Tsumeb, Namibia. Link to MinDat.org Location Data.

Name Origin:

Named for its predominance of molybdenum and relation to fornacite.

Molybdofornacite Image

Images:

Molybdofornacite

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

Axial Ratios:

a:b:c =1.3622:1:2.9683

Cell Dimensions:

a = 8.1, b = 5.946, c = 17.65, Z = 4; beta = 108.17° V = 807.68 Den(Calc)= 6.50

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 3.32(1), 2.845(0.6), 2.979(0.6),

Physical Properties of Molybdofornacite

Cleavage:

None

Color:

Light green.

Density:

6.6

Diaphaniety:

Transparent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.

Habit:

Pistolitic - > 3mm rounded spherical grains.

Hardness:

2-3 - Gypsum-Calcite

Luster:

Adamantine

Streak:

yellow

Optical Properties of Molybdofornacite

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

Optical Data:

Biaxial (+), a=2.05, g=2.15, bire=0.1000

Pleochroism (x):

pale yellow.

Pleochroism (y):

pale yellow.

Pleochroism (z):

yellowish green.

Calculated Properties of Molybdofornacite

Electron Density:

r_electron=5.69 gm/cc
note: r_{Molybdofornacite}=6.60 gm/cc.

Fermion Index

Fermion Index = 0.14199
Boson Index = 0.85801

Photoelectric:

PE_{Molybdofornacite}= 962.65 barns/electron
U=PE_{Molybdofornacite} x r_electron=5,472.80 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Molybdofornacite is Not Radioactive

Molybdofornacite Classification

Dana Class:

43.4.3.3 (43)Compound Phosphates, etc.

(43.4)(Anhydrous Compound Anions With Hydroxyl or Halogen)

(43.4.3)Brackebushite Group

43.4.3.1 Vauquelinite Pb2Cu(CrO4)(PO4)(OH) P 2₁/n 2/m

43.4.3.2 Fornacite Pb2Cu(CrO4)(AsO4)(OH) P 2₁/c 2/m

43.4.3.3 Molybdofornacite Pb2Cu[(As,P)O4][(Mo,Cr)O4](OH) P 2₁/c 2/m

Strunz Class:

VI/F.02-30 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/F - Chromates [CrO4]2-

VI/F.02 - Wattersite - Satanaite series

VI/F.02-03 Wattersite Hg4HgCrO6 C 2/c 2/m

VI/F.02-05 Edoylerite Hg3CrO4S2 P 2₁/a 2/m

VI/F.02-07 Deanesmithite Hg2Hg3CrO5S2 P1 1

VI/F.02-10 Vauquelinite Pb2Cu(CrO4)(PO4)(OH) P 2₁/n 2/m

VI/F.02-20 Fornacite Pb2Cu(CrO4)(AsO4)(OH) P 2₁/c 2/m

VI/F.02-30 Molybdofornacite Pb2Cu[(As,P)O4][(Mo,Cr)O4](OH) P 2₁/c 2/m

VI/F.02-40 Phoenicochroite Pb2(CrO4)O C 2/m 2/m

VI/F.02-50 Santanaite Pb9Pb2CrO16 P 6₃22 6 2 2

Other Molybdofornacite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)

See Also:

Links to other databases for Molybdofornacite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

Search for Molybdofornacite using:

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

Visit our Advertisers for Molybdofornacite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Molybdofornacite Mineral Data :

Ask about Molybdofornacite 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 Molybdofornacite Specimen Label here :

Molybdofornacite

Pb2Cu[(As,P)O4][(Mo,Cr)O4](OH)
Dana No: 43.4.3.3 Strunz No: VI/F.02-30
Locality:

Notes: