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:

Ti_0.6Ta_0.2Fe²⁺_0.2Nb_0.1O₂

Environment:

Late primary mineral in granite pegmatites. Strüverite (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

Comments: Struverite crystal in white feldspar.
Location: Pisek, Jihocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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 DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/mnm

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

By Intensity(I/I_o): 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:

PE_Struverite= 370.63 barns/electron
U=PE_Struverite 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

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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: