General Petscheckite Information Chemical Formula: |
U++++Fe++(Nb,Ta)2O8 |
Composition: |
Molecular Weight = 651.70 gm |
|
Uranium 36.52 % U 41.43 % UO2 |
|
Tantalum 13.88 % Ta 16.95 % Ta2O5 |
|
Niobium 21.38 % Nb 30.59 % Nb2O5 |
|
Iron 8.57 % Fe 11.02 % FeO |
|
Oxygen 19.64 % O |
|
______ ______ |
|
100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
UFe2+Nb1.5Ta0.5O8 |
Environment: |
Petscheckite is hypothesized on theoretical grounds, having altered to oxypetscheckite and hydroxypetscheckite. |
IMA Status: |
Approved IMA 1978 |
Locality: |
Antsaoka I pegmatite, Berere district, Madagascar. Link to MinDat.org Location Data. |
Name Origin: |
Named for Eckhard Petsch (1939-), of Idar-Oberstein, Germany, who was a noteworthy prospector in Madagascar. |
Name Pronunciation: |
Petscheckite + Pronunciation |
Synonym: |
Hydroxypetscheckite |
|
Oxypetscheckite |
| | Search for Petscheckite Images
Images:
|
|
| | Petscheckite Crystallography Axial Ratios: |
a:c = 1:0.62616 |
Cell Dimensions: |
a = 6.42, c = 4.02, Z = 1; V = 143.49 Den(Calc)= 7.54 |
Crystal System: |
Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: P 31m |
X Ray Diffraction: |
By Intensity(I/Io): 3.21(1), 4.02(1), 2.51(0.8), |
| Physical Properties of Petscheckite Cleavage: |
None |
Color: |
Black. |
Density: |
5.5 |
Diaphaneity: |
Opaque |
Habit: |
Metamict - Mineral originally crystalline, now amorphous due to radiation damage. |
Hardness: |
5 - Apatite |
Luster: |
Metallic |
Streak: |
brown black |
| Optical Properties of Petscheckite Optical Data: |
NCalc= 2.28 - from Gladstone-Dale relationship (KC = 0.1697) where Ncalc=Dcalc*KC+1 |
NCalc= 1.93 - from Gladstone-Dale relationship (KC = 0.1697) where Ncalc=Dmeas*KC+1 | Calculated Properties of Petscheckite Electron Density: |
Bulk Density (Electron Density)=6.48 gm/cc |
note: Specific Gravity of Petscheckite =7.54 gm/cc. Fermion Index: |
Fermion Index = 0.0045573699 |
Boson Index = 0.9954426301 Photoelectric: |
PEPetscheckite =1,168.76 barns/electron |
U=PEPetscheckite x relectron=7,572.38 barns/cc. Radioactivity: |
|
GRapi = 2,675,160.58 (Gamma Ray American Petroleum Institute Units)
Petscheckite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram. Estimated Maximum U.S. Postal Shipping Size
(10 mRem/hr limit, Unshielded 10 cm box)
11.37 ± 2.84 grams of pure Petscheckite .
Weight of pure Petscheckite in grams (gm) and Calculated Diameter of a Sphere with a Density of 7.54 gm/cc.* | Petscheckite Classification Dana Class: |
08.01.09.02 (08)Multiple Oxides with Nb, Ta, and Ti |
|
(08.01)where A BO4 |
|
(08.01.09)Dana Group |
|
|
Strunz Class: |
04.DH.35 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate |
|
04.D - Metal:Oxygen = 1:2 and similar |
|
04.DH -With large (± medium-sized) cations; sheets of edge-sharing octahedra |
|
|
| Other Petscheckite Information References: |
NAME( Dana8) PHYS. PROP.(Dana8) |
See Also: |
Links to other databases for Petscheckite : |
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 15 - Uranium Minerals Search for Petscheckite using: Visit our Advertisers for Petscheckite : A Bijoux Google Search for PetscheckiteAdam's Minerals Google Search for Petscheckite Cape Minerals Google Search for Petscheckite Dakota Matrix Minerals Google Search for Petscheckite Excalibur Mineral Corp. Google Search for Petscheckite Exceptional Minerals Google Search for Petscheckite John Betts Fine Minerals Search for Petscheckite McDougall Minerals Google Search for Petscheckite Mineral News Website Link Rock and Mineral Shows Google Search for Petscheckite Weinrich Minerals, Inc. Google Search for Petscheckite Ask about Petscheckite here : Print or Cut-and-Paste your Petscheckite Specimen Label here :
| |
|
| |