Ilmenorutile Mineral Data

Ilmenorutile Mineral Data +

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General Ilmenorutile Information

Chemical Formula:

(Ti,Nb,Fe+++)O2

Composition:

Molecular Weight = 95.27 gm

Titanium 35.18 % Ti 58.69 % TiO₂

Niobium 19.50 % Nb 27.90 % Nb₂O₅

Iron 11.72 % Fe 15.08 % FeO

Oxygen 33.59 % O

______ ______

100.00 % 101.68 % = TOTAL OXIDE

Empirical Formula:

Ti_0.7Nb_0.2Fe²⁺_0.2O₂

Environment:

Late primary mineral in granite pegmatites, carbonatites, and found in alluvial placers.

IMA Status:

Valid Species (Pre-IMA) 1854

Locality:

Miass, Ilmen Mountains, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the occurrence in the Ilmen Mountains and the relation to rutile.

Ilmenorutile Image

Images:

Ilmenorutile

Comments: Dark brown ilmenorutile crystal in matrix.
Location: Iveland, Aust-Agder, Norway. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ilmenorutile Crystallography

Axial Ratios:

a:c = 1:0.64741

Cell Dimensions:

a = 4.606, c = 2.982, Z = 2; V = 63.26 Den(Calc)= 5.00

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): 3.23(1), 1.687(0.9), 2.48(0.8),

Physical Properties of Ilmenorutile

Cleavage:

[110] Distinct, [100] Imperfect

Color:

Iron black, Black.

Density:

4.35 - 4.92, Average = 4.63

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:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

6-6.5 - Orthoclase-Pyrite

Luster:

Sub Metallic

Streak:

reddish brown

Optical Properties of Ilmenorutile

Dichroism (e):

brown.

Dichroism (w):

dark bluish green.

Optical Data:

Uniaxial (-).

NCalc= 2.67 - from Gladstone-Dale relationship (KC = 0.3338) where Ncalc=Dcalc*KC+1
NCalc= 2.55 - from Gladstone-Dale relationship (KC = 0.3338) where Ncalc=Dmeas*KC+1

RL Anisotrophism:

Strong.

RL Bireflectance:

Weak.

RL Color:

Pale creamy white.

Calculated Properties of Ilmenorutile

Electron Density:

r_electron=4.70 gm/cc
note: r_Ilmenorutile=5.00 gm/cc.

Fermion Index

Fermion Index = 0.04813
Boson Index = 0.95187

Photoelectric:

PE_Ilmenorutile= 38.88 barns/electron
U=PE_Ilmenorutile x r_electron= 182.85 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ilmenorutile is Not Radioactive

Ilmenorutile Classification

Dana Class:

4.4.1.2 (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.03-10 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 Ilmenorutile Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(AntBidBlaNic3) OPTIC PROP.(AntBidBlaNic3)

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

Ilmenorutile

(Ti,Nb,Fe+++)O2
Dana No: 4.4.1.2 Strunz No: IV/D.03-10
Locality:

Notes: