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| name = Titanoholtite |
| name = Titanoholtite |
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| category = [[Silicate mineral]] |
| category = [[Silicate mineral]] |
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| image = |
| image = |
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| imagesize = |
| imagesize = |
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| alt = |
| alt = |
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| caption = |
| caption = |
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| formula = (Ti<sub>0.75</sub>[]<sub>0.25</sub>)Al<sub>6</sub>BSi<sub>3</sub>O<sub>18</sub> |
| formula = (Ti<sub>0.75</sub>[]<sub>0.25</sub>)Al<sub>6</sub>BSi<sub>3</sub>O<sub>18</sub> |
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| strunz = |
| strunz = |
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| dana = |
| dana = |
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| symmetry = Orthorhombic |
| symmetry = Orthorhombic – dipyramidal <br />[[H-M symbol]] (mmm) <br />Space group ''Pbcm'' |
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| unit cell = a = 47.00 [[Ångström|Å]], b = 11.83 Å <br/>c = 20.24 Å |
| unit cell = a = 47.00 [[Ångström|Å]], b = 11.83 Å <br />c = 20.24 Å |
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| color = |
| color = |
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| colour = |
| colour = |
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| habit = |
| habit = |
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| system = [[Orthorhombic]] |
| system = [[Orthorhombic]] |
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| twinning = |
| twinning = |
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| cleavage = |
| cleavage = |
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| fracture = |
| fracture = |
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| tenacity = |
| tenacity = |
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| mohs = |
| mohs = |
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| luster = |
| luster = |
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| streak = |
| streak = |
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| diaphaneity = |
| diaphaneity = |
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| gravity = |
| gravity = |
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| density = |
| density = |
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| polish = |
| polish = |
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| opticalprop = |
| opticalprop = |
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| refractive = |
| refractive = |
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| birefringence = |
| birefringence = |
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| pleochroism = |
| pleochroism = |
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| 2V = |
| 2V = |
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| dispersion = |
| dispersion = |
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| extinction = |
| extinction = |
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| length fast/slow = |
| length fast/slow = |
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| fluorescence = |
| fluorescence = |
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| absorption = |
| absorption = |
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| melt = |
| melt = |
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| fusibility = |
| fusibility = |
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| diagnostic = |
| diagnostic = |
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| solubility = |
| solubility = |
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| impurities = |
| impurities = |
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| alteration = |
| alteration = |
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| other = |
| other = |
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| references = <ref name=MinMag>Pieczka, A., Evans, R.J., Grew, E.S., Groat, L.A., Ma, C., and Rossman, G.R., 2013. The dumortierite supergroup. II. Three new minerals from the Szklary pegmatite, SW Poland: Nioboholtite, (Nb<sub>0.6</sub>[]<sub>0.4</sub>)Al<sub>6</sub>BSi<sub>3</sub>O<sub>18</sub>, titanoholtite, (Ti<sub>0.75</sub>[]<sub>0.25 </sub>)Al<sub>6</sub>BSi<sub>3</sub>O<sub>18</sub>, and szklaryite, []Al<sub>6</sub>BAs<sup>3+</sup><sub>3</sub>O<sub>15</sub>. Mineralogical Magazine 77(6), |
| references = <ref name=MinMag>Pieczka, A., Evans, R.J., Grew, E.S., Groat, L.A., Ma, C., and Rossman, G.R., 2013. The dumortierite supergroup. II. Three new minerals from the Szklary pegmatite, SW Poland: Nioboholtite, (Nb<sub>0.6</sub>[]<sub>0.4</sub>)Al<sub>6</sub>BSi<sub>3</sub>O<sub>18</sub>, titanoholtite, (Ti<sub>0.75</sub>[]<sub>0.25 </sub>)Al<sub>6</sub>BSi<sub>3</sub>O<sub>18</sub>, and szklaryite, []Al<sub>6</sub>BAs<sup>3+</sup><sub>3</sub>O<sub>15</sub>. Mineralogical Magazine 77(6), 2841–2856</ref><ref name=Mindat>{{cite web|url=http://www.mindat.org/min-43589.html |title=Titanoholtite: Titanoholtite mineral information and data |website=Mindat.org |accessdate=2016-03-03}}</ref> |
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}} |
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'''Titanoholtite''' is an extremely rare mineral with the formula (Ti<sub>0.75</sub>[]<sub>0.25</sub>)Al<sub>6</sub>BSi<sub>3</sub>O<sub>18</sub>. It is [[titanium]]-rich member of [[dumortierite]] supergroup, and [[titanium]]-analogue of holtite of the holtite group. It is one of three quite recently found minerals of this group, the other two being [[nioboholtite]] and [[szklaryite]], all coming from the [[Szklary, Ząbkowice Śląskie County|Szklary]] village near [[Ząbkowice Śląskie]] in Poland. They occur in |
'''Titanoholtite''' is an extremely rare mineral with the formula (Ti<sub>0.75</sub>[]<sub>0.25</sub>)Al<sub>6</sub>BSi<sub>3</sub>O<sub>18</sub>. It is [[titanium]]-rich member of [[dumortierite]] supergroup, and [[titanium]]-analogue of holtite of the holtite group. It is one of three quite recently found minerals of this group, the other two being [[nioboholtite]] and [[szklaryite]], all coming from the [[Szklary, Ząbkowice Śląskie County|Szklary]] village near [[Ząbkowice Śląskie]] in Poland. They occur in a unique [[pegmatite]] of probable anatectic origin.<ref name=MinMag /><ref name=Mindat /> |
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==Association== |
== Association == |
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Titanoholtite is closely associated with [[holtite]] and [[nioboholtite]]; its further association is very rich (see [[szklaryite]]).<ref name=MinMag/> |
Titanoholtite is closely associated with [[holtite]] and [[nioboholtite]]; its further association is very rich (see [[szklaryite]]).<ref name=MinMag /> |
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==Notes on chemistry== |
== Notes on chemistry == |
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Impurities in titanoholtite are mainly [[antimony]] and [[arsenic]], with trace [[niobium]], [[tantalum]], [[titanium]], and [[iron]].<ref name=MinMag/> |
Impurities in titanoholtite are mainly [[antimony]] and [[arsenic]], with trace [[niobium]], [[tantalum]], [[titanium]], and [[iron]].<ref name=MinMag /> |
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==References== |
== References == |
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{{Reflist}} |
{{Reflist}} |
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[[Category:Borate minerals]] |
[[Category:Borate minerals]] |
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[[Category:Orthorhombic minerals]] |
[[Category:Orthorhombic minerals]] |
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{{silicate-mineral-stub}} |
{{silicate-mineral-stub}} |
Revision as of 03:16, 18 April 2016
Titanoholtite | |
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General | |
Category | Silicate mineral |
Formula (repeating unit) | (Ti0.75[]0.25)Al6BSi3O18 |
Crystal system | Orthorhombic |
Space group | Orthorhombic – dipyramidal H-M symbol (mmm) Space group Pbcm |
Unit cell | a = 47.00 Å, b = 11.83 Å c = 20.24 Å |
Identification | |
References | [1][2] |
Titanoholtite is an extremely rare mineral with the formula (Ti0.75[]0.25)Al6BSi3O18. It is titanium-rich member of dumortierite supergroup, and titanium-analogue of holtite of the holtite group. It is one of three quite recently found minerals of this group, the other two being nioboholtite and szklaryite, all coming from the Szklary village near Ząbkowice Śląskie in Poland. They occur in a unique pegmatite of probable anatectic origin.[1][2]
Association
Titanoholtite is closely associated with holtite and nioboholtite; its further association is very rich (see szklaryite).[1]
Notes on chemistry
Impurities in titanoholtite are mainly antimony and arsenic, with trace niobium, tantalum, titanium, and iron.[1]
References
- ^ a b c d Pieczka, A., Evans, R.J., Grew, E.S., Groat, L.A., Ma, C., and Rossman, G.R., 2013. The dumortierite supergroup. II. Three new minerals from the Szklary pegmatite, SW Poland: Nioboholtite, (Nb0.6[]0.4)Al6BSi3O18, titanoholtite, (Ti0.75[]0.25 )Al6BSi3O18, and szklaryite, []Al6BAs3+3O15. Mineralogical Magazine 77(6), 2841–2856
- ^ a b "Titanoholtite: Titanoholtite mineral information and data". Mindat.org. Retrieved 2016-03-03.