Struverite Mineral Data

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.

IMA Status:

Valid Species (Pre-IMA) 1907

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.

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

Diaphaniety:

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:

r_electron=5.45 gm/cc
note: r_Struverite=6.02 gm/cc.

Fermion Index

Fermion Index = 0.03383
Boson Index = 0.96617

Photoelectric:

PE_Struverite= 370.63 barns/electron
U=PE_Struverite x r_electron=2,018.76 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Struverite is Not Radioactive

Struverite Classification

Dana Class:

4.4.1.3 (4)Simple Oxides

(4.4)with a cation charge of 4+ (A++++ O2)

(4.4.1)Rutile group (Tetragonal: P4/mnm)

4.4.1.1 Rutile TiO2 P 4/mnm 4/m 2/m 2/m

4.4.1.2 Ilmenorutile (Ti,Nb,Fe)O2 P 4/mnm 4/m 2/m 2/m

4.4.1.3 Struverite (Ti,Ta,Fe)O2 P 4/mnm 4/m 2/m 2/m

4.4.1.4 Pyrolusite MnO2 P 4/mnm 4/m 2/m 2/m

4.4.1.5 Cassiterite SnO2 P 4/mnm 4/m 2/m 2/m

4.4.1.6 Plattnerite PbO2 P 4/mnm 4/m 2/m 2/m

4.4.1.7 Argutite GeO2 P 4/mnm 4/m 2/m 2/m

4.4.1.8 Squawcreekite? (Fe,Sb,W)O4·(H2O) P 4/mnm 4/m 2/m 2/m

4.4.1.9 Stishovite SiO2 P 4/mnm 4/m 2/m 2/m

Strunz Class:

IV/D.03-20 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.03 - Rutile group, Ilmenorutile - Strüverite series

IV/D.03-10 Ilmenorutile (Ti,Nb,Fe)O2 P 4/mnm 4/m 2/m 2/m

IV/D.03-20 Struverite (Ti,Ta,Fe)O2 P 4/mnm 4/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 -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

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Print or Cut-and-Paste your Struverite Specimen Label here :

Struverite

(Ti,Ta,Fe+++)O2
Dana No: 4.4.1.3 Strunz No: IV/D.03-20
Locality:

Notes: