Titanclinohumite
A variety of Hydroxylclinohumite
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About Titanclinohumite
Formula:
(Mg,Ti)9(SiO4)4(OH,O,F)2
Lustre:
Vitreous
Hardness:
6
Crystal System:
Monoclinic
A Ti-bearing variety of both Clinohumite and Hydroxylclinohumite.
The varietal name titanoclinohumite (older literature uses the name "titanolivine" for this variety) is commonly used to indicate Ti-bearing hydroxylclinohumite found in metamorphosed serpentinites. Zambonini (1919) came to the conclusion that "titanolivine" from Ala Valley (Piedmont, Italy) is a titanian clinohumite very rich in OH and pratically F-free; therefore, he proposed, unsuccessfully, to substitute the name "titanolivine" with "titanhydroclinohumite" or "hydroclinohumite titanifère" (the species hydroxylclinohumite has been instituted in 1998 only).
The varietal name titanoclinohumite (older literature uses the name "titanolivine" for this variety) is commonly used to indicate Ti-bearing hydroxylclinohumite found in metamorphosed serpentinites. Zambonini (1919) came to the conclusion that "titanolivine" from Ala Valley (Piedmont, Italy) is a titanian clinohumite very rich in OH and pratically F-free; therefore, he proposed, unsuccessfully, to substitute the name "titanolivine" with "titanhydroclinohumite" or "hydroclinohumite titanifère" (the species hydroxylclinohumite has been instituted in 1998 only).
Unique Identifiers
Mindat ID:
7338 (as Titanclinohumite)
7729 (as Hydroxylclinohumite)
7729 (as Hydroxylclinohumite)
Long-form identifier:
mindat:1:1:7338:3 (as Titanclinohumite)
mindat:1:1:7729:9 (as Hydroxylclinohumite)
mindat:1:1:7729:9 (as Hydroxylclinohumite)
IMA Classification of Titanclinohumite
Discredited
Approval history:
Discredited by IMA in 2006 (IMA 06–C) = Ti-bearing clinohumite, cf. Burke (2006).
Physical Properties of Titanclinohumite
Vitreous
Hardness:
6 on Mohs scale
Chemistry of Titanclinohumite
Mindat Formula:
(Mg,Ti)9(SiO4)4(OH,O,F)2
Element Weights:
Crystallography of Titanclinohumite
Crystal System:
Monoclinic
Synonyms of Titanclinohumite
Other Language Names for Titanclinohumite
Common Associates
Associations Based on Photo Data:
| 4 photos of Titanclinohumite associated with Diopside | CaMgSi2O6 |
| 3 photos of Titanclinohumite associated with Geikielite | MgTiO3 |
| 3 photos of Titanclinohumite associated with Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
| 3 photos of Titanclinohumite associated with Magnetite | Fe2+Fe3+2O4 |
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 Titanclinohumite
mindat.org URL:
https://www.mindat.org/min-7338.html
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References for Titanclinohumite
Reference List:
McGetchin, T. R., Silver, L. T., Chodos, A. A. (1970) Titanoclinohumite: A possible mineralogical site for water in the upper mantle. Journal of Geophysical Research, 75 (2) 255-259 doi:10.1029/jb075i002p00255
Robinson, Keith, Gibbs, G. V., Ribbe, and Paul H. (1973) The crystal structures of the humite minerals. IV. Clinohumite and titanoclinohumite. American Mineralogist, 58 (1-2) 43-49
Ferraris, Giovanni, Prencipe, M., Sokolova, E., Gekimyants, V.M., Spiridonov, E.M. (2000) Hydroxylclinohumite, a new member of the humite group: Twinning, crystal structure and crystal chemistry of the clinohumite subgroup. Zeitschrift für Kristallographie - Crystalline Materials, 215 (3). 169-173 doi:10.1524/zkri.2000.215.3.169
Localities for Titanclinohumite
Showing 73 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.
Stubenberg Quarry, Stubenberg am See, Hartberg-Fürstenfeld District, Styria, Austria