| |
 |
Struverite Mineral Data
|
|
|
General Struverite Information
|
 Chemical Formula: |
(Ti,Ta,Fe+++)O2 |
| Composition: |
Molecular Weight = 117.38 gm |
| |
Tantalum 30.83 % Ta 37.65 % Ta2O5 |
| |
Titanium 24.48 % Ti 40.83 % TiO2 |
| |
Niobium 7.92 % Nb 11.32 % Nb2O5 |
| |
Iron 9.52 % Fe 12.24 % FeO |
| |
Oxygen 27.26 % O |
| |
______ ______ |
| |
100.00 % 102.04 % = TOTAL OXIDE |
| Empirical Formula: |
Ti0.6Ta0.2Fe2+0.2Nb0.1O2 |
| Environment: |
Late primary mineral in granite pegmatites. Str�verite (1907) is now considered Ta-bearing rutile. |
| IMA Status: |
Discredited IMA 2006 |
| Locality: |
Craveggia, Val Vigezzo, Peidmont, Italy. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Giovanni Struver (1842-1915), mineralogist, University of Rome, Italy. |
| Name Pronunciation: |
Struverite + Pronunciation  |
| Synonym: |
Strueverite |
| |
Struverite Image |
|
Images:
|
|
Struverite Crystallography
|
| Axial Ratios: |
a:c = 1:0.64564 |
| Cell Dimensions: |
a = 4.645, c = 2.999, Z = 2; V = 64.71 Den(Calc)= 6.02 |
| Crystal System: |
Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 4/mnm |
| X Ray Diffraction: |
By Intensity(I/Io): 1.707(1), 3.28(1), 2.52(0.9), |
| |
Physical Properties of Struverite
|
| Cleavage: |
{110} Distinct |
| Color: |
Black, Black. |
| Density: |
5.25 |
| Diaphaneity: |
Opaque |
| Fracture: |
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz). |
| Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
| Habit: |
Pyramidal - Crystals are shaped like pyramids. |
| Habit: |
Twinning Common - Crystals are usually twinned. |
| Hardness: |
6-6.5 - Orthoclase-Pyrite |
| Luster: |
Adamantine - Resinous |
| Streak: |
grayish black |
| |
Optical Properties of Struverite
|
| Dichroism (e): |
green dark bluish or greenish blue. |
| Dichroism (w): |
brown. |
| Optical Data: |
Uniaxial (+). |
| |
NCalc= 2.63 - from Gladstone-Dale relationship (KC = 0.2707) where Ncalc=Dcalc*KC+1
NCalc= 2.42 - from Gladstone-Dale relationship (KC = 0.2707) where Ncalc=Dmeas*KC+1
|
| |
Calculated Properties of Struverite
|
| Electron Density: |
Bulk Density (Electron Density)=5.45 gm/cc
note: Specific Gravity of Struverite =6.02 gm/cc.
|
| Fermion Index: |
Fermion Index = 0.03
Boson Index = 0.97 |
| Photoelectric: |
PEStruverite = 370.63 barns/electron
U=PEStruverite x rElectron Density=2,018.76 barns/cc.
|
| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Struverite is Not Radioactive |
| |
Struverite Classification
|
| Dana Class: |
04.04.01.03 (04)Simple Oxides |
| |
(04.04)with a cation charge of 4+ (A++++ O2) |
| |
(04.04.01)Rutile group (Tetragonal: P4/mnm) |
| |
04.04.01.01 Rutile TiO2 P 4/mnm 4/m 2/m 2/m |
| |
04.04.01.02 Ilmenorutile (Ti,Nb,Fe)O2 P 4/mnm 4/m 2/m 2/m |
| |
04.04.01.03 Struverite? (Ti,Ta,Fe)O2 P 4/mnm 4/m 2/m 2/m |
| |
04.04.01.04 Pyrolusite MnO2 P 4/mnm 4/m 2/m 2/m |
| |
04.04.01.05 Cassiterite SnO2 P 4/mnm 4/m 2/m 2/m |
| |
04.04.01.06 Plattnerite PbO2 P 4/mnm 4/m 2/m 2/m |
| |
04.04.01.07 Argutite GeO2 P 4/mnm 4/m 2/m 2/m |
| |
04.04.01.08 Squawcreekite? (Fe,Sb,W)O4•(H2O) P 4/mnm 4/m 2/m 2/m |
| |
04.04.01.09 Stishovite SiO2 P 4/mnm 4/m 2/m 2/m |
| Strunz Class: |
04.XX.00 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate |
| |
04.X - Unclassified Strunz OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, telluri |
| |
04.XX -Rutile Group |
| |
04.XX.00 Ashanite? (Nb,Ta,U,Fe,Mn)4O8 Pcan 2/m 2/m 2/m |
| |
04.XX.00 Methane hydrate-I! 46(H2O)•2(S)•6(L) P m3n 4/m 3 2/m |
| |
04.XX.00 Clinobirnessite* Na4Mn14O27•9(H2O) Mono |
| |
04.XX.00 Chubutite* Pb7O6Cl2 Unk Ortho |
| |
04.XX.00 Kleberite* FeTi6O13•4(H2O)(?) P 63mcm ? 6mm |
| |
04.XX.00 Hongquiite* TiO F m3m 4/m 3 2/m |
| |
04.XX.00 Psilomelane? (Ba,H2O)2Mn5O10 A2/m 2/m |
| |
04.XX.00 Struverite? (Ti,Ta,Fe)O2 P 4/mnm 4/m 2/m 2/m |
| |
04.XX.00 Ungursaite* NaCa5(Ta,Nb)24O65(OH) P 63/m,P 63 Hex |
| |
04.XX.00 Uhligite? Ca3(Ti,Al,Zr)9O20 Unk Cubic |
| |
04.XX.00 Scheteligite? (Ca,Y,Sb,Mn)2(Ti,Ta,Nb,W)2O6(O,OH) Unk Ortho |
| |
04.XX.00 Allendeite! Sc4Zr3O12 R 3 3 |
| |
04.XX.00 IMA2000-016! (Ti,Fe,Mg,Mn)1-xTi2O5 Pban 2/m 2/m 2/m |
| |
04.XX.00 Methane hydrate-II! 136(H2O)•16(S)•8(L) F d3m 4/m 3 2/m |
| |
04.XX.00 IMA2000-026! (Mn,Li)4(Ta,Sn)4(Ta,Nb)8O32 C 2/c 2/m |
| |
04.XX.00 Methane hydrate-H! 34(H2O)•3(S)•2(M)•1(L) P 6/mmm 6/m 2/m 2/m |
| |
Other Struverite Information
|
| References: |
NAME( AntBidBlaNic3) PHYS. PROP.(AntBidBlaNic3) OPTIC PROP.(AntBidBlaNic3) |
| See Also: |
Links to other databases for Struverite :
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
Search for Struverite using:
[AOL]
[Bing]
[Dog Pile]
[GeoScienceWorld]
[HotBot]
[Ixquick]
[Lycos]
[MAMMA]
[Scirus]
[Teoma]
[WebCrawler]
[Wikipedia]
[YAHOO]
Visit our Advertisers for Struverite :
Ask about Struverite 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 Struverite Specimen Label here :
|
Struverite
(Ti,Ta,Fe+++)O2
Dana No: 04.04.01.03 Strunz No: 04.XX.00
Locality:
Notes:
|
|
| |
| |
|
| |
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.
