Montroseite Mineral Data

Montroseite Mineral Data +

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General Montroseite Information

Chemical Formula:

(V+++,Fe+++,V++++)O(OH)

Composition:

Molecular Weight = 85.42 gm

Vanadium 41.75 % V 52.64 % V₂O₃ / 10.65 % V₂O₅

Iron 19.61 % Fe 25.23 % FeO

Hydrogen 1.18 % H 10.55 % H₂O

Oxygen 37.46 % O

______ ______

100.00 % 99.06 % = TOTAL OXIDE

Empirical Formula:

V³⁺_0.6Fe²⁺_0.3V⁵⁺_0.1O(OH)

Environment:

In relatively unoxidized Colorado Plateau-type U-V ores in sandstones.

IMA Status:

Valid Species (Pre-IMA) 1953

Locality:

Bitter Creek, Jo Dandy, Whitney, and Virgin mines, Uravan district, Montrose County, Colorado, USA. Link to MinDat.org Location Data.

Name Origin:

Named after the locality.

Synonym:

ICSD 22302

PDF 11-152

Montroseite Image

Images:

Montroseite

Comments: Black silky fibrous montroseite on sandstone with tyuyamunite.
Location: Monument No. 2 Mine, Kayenta, Apache County, Arizona, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Montroseite Crystallography

Axial Ratios:

a:b:c =0.5084:1:0.309

Cell Dimensions:

a = 4.82, b = 9.48, c = 2.93, Z = 4; V = 133.88 Den(Calc)= 4.24

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbnm

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

By Intensity(I/I_o): 2.644(1), 4.31(1), 3.38(0.8),

Crystal Structure:

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Evans H T , Block S , American Mineralogist , 38 (1953) p.1242-1250, The crystal structure of montroseite, a vanadium member of the diaspore group

View Additional jPOWD Structure files for Montroseite
[1]

Physical Properties of Montroseite

Cleavage:

[010] Good, [110] Good

Color:

Black, Grayish black.

Density:

Diaphaniety:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

5.5-6.5 - Knife Blade-Pyrite

Luster:

Sub Metallic

Streak:

black

Optical Properties of Montroseite

Optical Data:

Biaxial (?)

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Montroseite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	16.60	18.70
420 nm	15.80	18.00
440 nm	15.00	17.30
460 nm	14.60	17.00
480 nm	14.40	16.80
500 nm	14.30	16.60
520 nm	14.40	16.70
540 nm	14.60	16.80
560 nm	14.90	16.90
580 nm	15.10	17.10
600 nm	15.50	17.40
620 nm	15.80	17.80
640 nm	16.20	18.20
660 nm	16.60	18.70
680 nm	17.00	19.20
700 nm	17.50	19.80

**Calculated Relative Intensity Colors of Montroseite in Air**
Relative Intensity	0%	60%	100%	120%	180%	240%	300%	360%	420%	480%	540%	600%
R₁
R₂

Calculated Properties of Montroseite

Electron Density:

r_electron=4.06 gm/cc
note: r_Montroseite=4.24 gm/cc.

Fermion Index

Fermion Index = 0.00538
Boson Index = 0.99462

Photoelectric:

PE_Montroseite= 13.95 barns/electron
U=PE_Montroseite x r_electron= 56.64 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Montroseite is Not Radioactive

Montroseite Classification

Dana Class:

6.1.1.4 (6)Hydroxides and Oxides Containing Hydroxyl

(6.1)where X+++O OH

(6.1.1)Diaspore group (Orthorhombic, Pnma or Pnmd)

6.1.1.1 Diaspore AlO(OH) Pbnm 2/m 2/m 2/m

6.1.1.2 Goethite FeO(OH) Pbnm 2/m 2/m 2/m

6.1.1.3 Groutite MnO(OH) Pbnm 2/m 2/m 2/m

6.1.1.4 Montroseite (V,Fe,V)O(OH) Pbnm 2/m 2/m 2/m

6.1.1.5 Bracewellite CrO(OH) Pbnm 2/m 2/m 2/m

6.1.1.6 Tsumgallite! GaO(OH) Pbnm 2/m 2/m 2/m

Strunz Class:

IV/F.08-20 IV - Oxides

IV/F - Hydroxides and oxidic hydrates, water-bearing oxides with layered structure

IV/F.08 - Tivanite - Paramontroseite series (V3+ oxides)

IV/F.08-10 Tivanite VTiO3(OH) P 2₁/c 2/m

IV/F.08-20 Montroseite (V,Fe,V)O(OH) Pbnm 2/m 2/m 2/m

IV/F.08-30 Paramontroseite VO2 Pbnm 2/m 2/m 2/m

Other Montroseite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Montroseite :
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 - WWW-MINCRYST 13 -École des Mines de Paris

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Montroseite

(V+++,Fe+++,V++++)O(OH)
Dana No: 6.1.1.4 Strunz No: IV/F.08-20
Locality:

Notes: