UM1984-20-O:CrFeHTiV
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Formula:
(Fe3+,Cr3+,V3+)Ti2O6 · nH2O
author's formulas: (Fe3+,Cr3+,V5+)Ti2O6 (doesn't consider the high water amount) or Sr0.21REE0.26Si0.43Ti14.00Fe3.50V1.28Cr1.58O38
Colour:
black
Lustre:
Adamantine, Metallic
Hardness:
6
May be related to pseudobrookite or crichtonite group. Chemically somewhat similar to carmichaelite (if one take the first type of the formula into consideration). On the other hand, it chemically resembles crichtonite.
Found in anatase-albitite dike (20 cm in width); metamict due to small amount of Th, and is highly hydrated. Contains inclusions of galena and often contains rims of pyrrhotite. The crystals (pseudocubes, 1-2 mm in size; cross-like individuals also encountered) are surrounded by reaction halos.
Found in anatase-albitite dike (20 cm in width); metamict due to small amount of Th, and is highly hydrated. Contains inclusions of galena and often contains rims of pyrrhotite. The crystals (pseudocubes, 1-2 mm in size; cross-like individuals also encountered) are surrounded by reaction halos.
Unique Identifiers
Mindat ID:
47759
Long-form identifier:
mindat:1:1:47759:0
Physical Properties of UM1984-20-O:CrFeHTiV
Adamantine, Metallic
Colour:
Black
Streak:
Black-brown with a reddish tint
Hardness:
6 on Mohs scale
Tenacity:
Brittle
Fracture:
Conchoidal
Optical Data of UM1984-20-O:CrFeHTiV
Anisotropism:
weak
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 546nm | 17.0% | 17.4% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 17.4%.
R1 shown in black, R2 shown in red
Chemistry of UM1984-20-O:CrFeHTiV
Mindat Formula:
(Fe3+,Cr3+,V3+)Ti2O6 · nH2O
author's formulas: (Fe3+,Cr3+,V5+)Ti2O6 (doesn't consider the high water amount) or Sr0.21REE0.26Si0.43Ti14.00Fe3.50V1.28Cr1.58O38
author's formulas: (Fe3+,Cr3+,V5+)Ti2O6 (doesn't consider the high water amount) or Sr0.21REE0.26Si0.43Ti14.00Fe3.50V1.28Cr1.58O38
Element Weights:
Common Impurities:
Cr,V,Sr,Si,Sr,La,Ce,Sc,Th,(Y,Pr,Eu,Tb,Ho)
Crystallography of UM1984-20-O:CrFeHTiV
Morphology:
pseudocubes, 1-2 mm in size; cross-like individuals also encountered
Other Information
Thermal Behaviour:
results of heating in nitrogen: formation of rutile (at 700, 800, and 900oC), then brannerite (at 1000 and 1200oC)
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for UM1984-20-O:CrFeHTiV
mindat.org URL:
https://www.mindat.org/min-47759.html
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References for UM1984-20-O:CrFeHTiV
Localities for UM1984-20-O:CrFeHTiV
Showing 1 localities.
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The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Norway | |
| Segalstad (1984) |
