UM1978-08-O:AlCaCrFeMgTi
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Formula:
(Ti3+,Cr,Al,Ca,Mg,Fe)(Ti)2-3O7
the above formula is proposed by Nickel & Smith (2007); however, the correct formula based on the empirical one reported in the original paper is rather (Ca,Mg,Ti3+,Al,Fe)Ti2.8O7;
suggested as a possible series between (Ca,Mg,Fe,Mn)Ti4+3O7 and (Ti3+,Cr,Al)2Ti4+2O7
suggested as a possible series between (Ca,Mg,Fe,Mn)Ti4+3O7 and (Ti3+,Cr,Al)2Ti4+2O7
Most likely identical to magnéliite.
Reported as a new titanate from the Allende meteorite; in inclusions consisting also of anorthite, fassaite, spinel, olivine, and interstitial armalcolite. Forms crystals, from below 10 to 100 microns in size (mean: 20 microns).
Apart from the suggested solid solution, the phase might be related to crichtonite group. PXRD data is not given.
A rare example of a phase rich in trivalent titanium (compare tistarite, grossmanite and 'UM1971-21-SiO:AlCaMgTi'.
Reported as a new titanate from the Allende meteorite; in inclusions consisting also of anorthite, fassaite, spinel, olivine, and interstitial armalcolite. Forms crystals, from below 10 to 100 microns in size (mean: 20 microns).
Apart from the suggested solid solution, the phase might be related to crichtonite group. PXRD data is not given.
A rare example of a phase rich in trivalent titanium (compare tistarite, grossmanite and 'UM1971-21-SiO:AlCaMgTi'.
Unique Identifiers
Mindat ID:
47438
Long-form identifier:
mindat:1:1:47438:0
Physical Properties of UM1978-08-O:AlCaCrFeMgTi
Transparency:
Opaque
Optical Data of UM1978-08-O:AlCaCrFeMgTi
Anisotropism:
strong, gray to white
Colour in reflected light:
white
Comments:
Reflectivity ca. 19%
Chemistry of UM1978-08-O:AlCaCrFeMgTi
Mindat Formula:
(Ti3+,Cr,Al,Ca,Mg,Fe)(Ti)2-3O7
the above formula is proposed by Nickel & Smith (2007); however, the correct formula based on the empirical one reported in the original paper is rather (Ca,Mg,Ti3+,Al,Fe)Ti2.8O7;
suggested as a possible series between (Ca,Mg,Fe,Mn)Ti4+3O7 and (Ti3+,Cr,Al)2Ti4+2O7
the above formula is proposed by Nickel & Smith (2007); however, the correct formula based on the empirical one reported in the original paper is rather (Ca,Mg,Ti3+,Al,Fe)Ti2.8O7;
suggested as a possible series between (Ca,Mg,Fe,Mn)Ti4+3O7 and (Ti3+,Cr,Al)2Ti4+2O7
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 UM1978-08-O:AlCaCrFeMgTi
mindat.org URL:
https://www.mindat.org/min-47438.html
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References for UM1978-08-O:AlCaCrFeMgTi
Reference List:
Localities for UM1978-08-O:AlCaCrFeMgTi
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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.
Mexico | |
| Haggerty (1978) +1 other reference |
