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Unnamed (F-analogue of Schorl)

Big Photo

Lake Boga granite quarry, Lake Boga, Victoria, Australia
© Stuart Mills 2003

Show Unnamed (F-analogue of Schorl) Photos (4)
Formula:
[(Na,K)][Fe
2+
3
][Al
 
6
][(OH)
 
3
|F|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
System:Trigonal


The F-analogue of schorl.

Apparently not really uncommon (Kolitsch & Ertl, unpubl. results).
First reported from Grasstein, Trentino – South Tyrol, Italy.

The final name of this species will depend on the consensus reached by an IMA Subcommittee on tourmaline nomenclature (final report expected around 2009).

Classification of Unnamed (F-analogue of Schorl)

IMA status:Not Approved
Strunz 8th edition ID:8/E.19-

8 : Silicates
E : Cyclosilicates, triplet rings [Si3O9]6-
19 : Tourmaline group
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Crystallography of Unnamed (F-analogue of Schorl)

Crystal System:Trigonal
Class (H-M):3m - Ditrigonal Pyramidal
Space Group:R3m
Cell Parameters:a = 15.997(2) Å, c = 7.179(1) Å
Ratio:a:c = 1 : 0.449
Unit Cell Volume:V 1591 ų
Z:3

Chemical Properties of Unnamed (F-analogue of Schorl)

Formula:
[(Na,K)][Fe
2+
3
][Al
 
6
][(OH)
 
3
|F|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
Essential elements:Al, B, F, Fe, H, Na, O, Si
All elements listed in formula:Al, B, F, Fe, H, K, Na, O, Si

Relationship of Unnamed (F-analogue of Schorl) to other Species

Related Minerals - Strunz Grouping):

- +
8/E.19-05Rossmanite
[ ][LiAl
 
2
][Al
 
6
][(OH)
 
3
|OH|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
8/E.19-10Elbaite
[Na][(Li,Al)
 
3
][Al
 
6
][(OH)
 
3
|OH|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
8/E.19-15Magnesiofoitite
[ ][Mg
 
2
(Al,Fe
3+
 
 )][Al
 
6
][(OH)
 
3
|OH|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
8/E.19-20Dravite
[Na][Mg
 
3
][Al
 
6
][(OH)
 
3
|OH|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
8/E.19-30Chromdravite
[Na][Mg
 
3
][(Cr
3+
 
,Fe
3+
 
)
 
6
][(OH)
 
3
|OH|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
8/E.19-40Vanadiumdravite
[Na][Mg
 
3
][V
3+
6
][(OH)
 
3
|OH|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
8/E.19-50Schorl
[Na][Fe
2+
3
][Al
 
6
][(OH)
 
3
|OH|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
8/E.19-55Foitite
[ ][Fe
2+
2
(Al,Fe
3+
 
)][Al
 
6
][(OH)
 
3
|OH|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
8/E.19-60Olenite
(Na,[ ])[(Al,Li)
 
3
][Al
 
6
][(O,OH)
 
3
|OH|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
8/E.19-70Buergerite
[Na][Fe
3+
3
][Al
 
6
][O
 
3
|F|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
8/E.19-75Povondraite
[Na][Fe
3+
3
][Fe
3+
4
Mg
 
2
][(OH)
 
3
|F|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
8/E.19-80Liddicoatite
[Ca][Li
 
2
Al][Al
 
6
][(OH)
 
3
|F|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
8/E.19-90Uvite
[Ca][(Mg,Fe
2+
 
)
 
3
][MgAl
 
5
][(OH)
 
3
|OH|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
8/E.19-100Feruvite
[Ca][(Fe
2+
 
 ,Mg)
 
3
][MgAl
 
5
][(OH)
 
3
|OH|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Unnamed (F-analogue of Schorl)

Reference List:A. Ertl, U. Kolitsch, S. Prowatke, M. D. Dyar and D. J. Henry (2006): The F-analogue of schorl from Grasstein, Trentino – South Tyrol, Italy: crystal structure and chemistry. Eur. J. Mineral. 18, 583-588.

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    Localities for Unnamed (F-analogue of Schorl)

    Hide Locality List
    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Australia
     
    • Victoria
      • Lake Boga
    		U. Kolitsch (unpubl. results)
    Czech Republic
     
    • Moravia (Mähren; Maehren)
      • Vysočina Region
        • Nedvědice
    		Novak, M., Selway, J. B. & Houzar, S. (1998): Potassium-bearing, fluorine-rich tourmaline from metamorphosed fluorite layer in leucocratic orthogneiss at Nedvedice, Svratka Unit, western Moravia. Journal of the Czech Geological Society 43, 37-44; U. Kolitsch & J. Cempirek, unpublished data
    Germany
     
    • Bavaria
      • Franconia
        • Fichtelgebirge
          • Weißenstadt
            • Kirchenlamitz
    		Uwe Kolitsch (unpubl. results)
    Italy
     
    • Trentino-Alto Adige
      • Bolzano Province (South Tyrol)
        • Sarentine Alps (Sarntal Alps)
          • Fortezza (Franzensfeste)
            • Grasstein
    		A. Ertl, U. Kolitsch, S. Prowatke, M. D. Dyar and D. J. Henry (2006): The F-analogue of schorl from Grasstein, Trentino – South Tyrol, Italy: crystal structure and chemistry. Eur. J. Mineral. 18, 583-588
    Namibia
     
    U. Kolitsch & A. Ertl (unpublished results)
    Mineral and/or Locality
    Google
     
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