UM2000-41-O:Ti (TiO2-II)
A material that is NOT an approved mineral species
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Also known as TiO2 II. A shock-induced or ultrahigh-pressure environment, dense polymorph of TiO2 with a α-PbO2 structure.
Originally reported from Ries Crater, Nördlingen, Swabia, Bavaria, Germany.
As an epitaxial growth, between two grain units of a twinned rutile grain; ca. 8 nm thick and 125 nm long.
At Xiuyan, the peak shock pressure and post-shock temperature in the TiO2-II-bearing gneiss are estimated to be between 35 and 43 GPa and 300–900°C, respectively.
Originally reported from Ries Crater, Nördlingen, Swabia, Bavaria, Germany.
As an epitaxial growth, between two grain units of a twinned rutile grain; ca. 8 nm thick and 125 nm long.
At Xiuyan, the peak shock pressure and post-shock temperature in the TiO2-II-bearing gneiss are estimated to be between 35 and 43 GPa and 300–900°C, respectively.
Unique Identifiers
Mindat ID:
29114
Long-form identifier:
mindat:1:1:29114:9
GUID
(UUID V4):
(UUID V4):
ca2c73b3-7167-42d4-aad7-4baa59721b4d
Physical Properties of UM2000-41-O:Ti (TiO2-II)
Transparency:
Opaque
Colour:
Colourless (synthetic)
Density:
4.372 g/cm3 (Calculated)
Chemistry of UM2000-41-O:Ti (TiO2-II)
Mindat Formula:
TiO2
Elements listed:
Crystallography of UM2000-41-O:Ti (TiO2-II)
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbcn
Setting:
Pbcn
Cell Parameters:
a = 4.59 Å, b = 5.44 Å, c = 4.94 Å
Ratio:
a:b:c = 0.844 : 1 : 0.908
Unit Cell V:
123.35 ų (Calculated from Unit Cell)
Comment:
in a good correspondence to the synthetic analog
Geological Environment
Geological Setting:
Meteoritic impact structures and ultrahigh-pressure metamorphic environments.
Synonyms of UM2000-41-O:Ti (TiO2-II)
Fluorescence of UM2000-41-O:Ti (TiO2-II)
Light red-orange cathodluminescence under electron microprobe (synthetic material).
Other Information
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 UM2000-41-O:Ti (TiO2-II)
mindat.org URL:
https://www.mindat.org/min-29114.html
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References for UM2000-41-O:Ti (TiO2-II)
Reference List:
Jambor, John L., Puziewicz, Jacek, Roberts, Andrew C. (2000) New Mineral Names. American Mineralogist, 85 (11-12) 1843-1847
Withers, Anthony C., Essene, Eric J., Zhang, Youxue (2003) Rutile/TiO2II phase equilibria. Contributions to Mineralogy and Petrology, 145 (2) 199-204 doi:10.1007/s00410-003-0445-2
Localities for UM2000-41-O:Ti (TiO2-II)
symbol to view information about a locality.
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.
China | |
| PbO2-type nanophase of TiO2 from ... +1 other reference |
| Xie et al. (2023) |
| Chen et al. (2018) |
| Zhang (2001) |
Germany | |
| El Goresy (2000, 2001a-c) | |
| PbO2-type TiO2 in garnet: a ... +1 other reference |
USA | |
| Jackson et al. (2006) |
