Mpororoite Mineral Data

General Mpororoite Information

Chemical Formula:

Al(WO3)(OH)3•2(H2O)

Composition:

Molecular Weight = 345.88 gm

Aluminum 7.80 % Al 14.74 % Al₂O₃

Hydrogen 2.04 % H 18.23 % H₂O

Tungsten 53.15 % W 67.03 % WO₃

Oxygen 37.01 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Al(WO₃)(OH)₃•2(H₂O)

Environment:

Alteration product of scheelite.

IMA Status:

Approved IMA 1972

Locality:

Mpororo tungsten mine, Kigezi, Uganda. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Mpororoite + Pronunciation

Mpororoite Image

Images:

Mpororoite Anthoinite

Comments: White chalky massive mpororoite with brown anthoinite.
Location: Kara Mine, Tasmania, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Mpororoite Crystallography

Axial Ratios:

a:b:c =0.8202:1:0.7155

Cell Dimensions:

a = 9.4, b = 11.46, c = 8.2, Z = 7; alpha = 94.33°, beta = 89.75°, gamma = 95.17° V = 877.22 Den(Calc)= 4.58

Crystal System:

Triclinic Space Group: P1 or P1

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

By Intensity(I/I_o): 8.21(1), 3.08(0.9), 4.2(0.2),5.69(0.2), 6.18(0.2), 2.36(0.1), 4.73(0.1),

Physical Properties of Mpororoite

Color:

Greenish yellow.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Powdery - Forms a loose, poorly-coherent pulverulent mass.

Luster:

Earthy (Dull)

Streak:

yellow white

Optical Properties of Mpororoite

Optical Data:

NCalc= 1.95 - from Gladstone-Dale relationship (KC = 0.2071) where Ncalc=Dcalc*KC+1

Calculated Properties of Mpororoite

Electron Density:

Bulk Density (Electron Density)=4.18 gm/cc
note: Specific Gravity of Mpororoite =4.58 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

PE_Mpororoite= 628.09 barns/electron
U=PE_Mpororoite x rElectron Density=2,628.11 barns/cc.

Radioactivity:

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

Mpororoite Classification

Dana Class:

49.03.04.01 (49)Basic and Hydrated Molybdates and Tungstates

(49.03)(Hydrated, containing Hydroxyl or Halogen)

(49.03.04)Dana Group

49.03.04.01 Mpororoite Al(WO3)(OH)3•2(H2O) P1 or P1 Tri

Strunz Class:

07.GB.35 07 - SULFATES (SELENATES, TELLURATES)

07.G - Molybdates, Wolframates and Niobates

07.GB -With additional anions and/or H2O

07.GB.35 Anthoinite AlWO3(OH)3 P1 or P1 Tri

07.GB.35 Mpororoite Al(WO3)(OH)3•2(H2O) P1 or P1 Tri

Other Mpororoite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8)

See Also:

Links to other databases for Mpororoite :
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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Print or Cut-and-Paste your Mpororoite Specimen Label here :

Mpororoite

Al(WO3)(OH)3•2(H2O)
Dana No: 49.03.04.01 Strunz No: 07.GB.35
Locality:

Notes:

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