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Traskite

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Esquire No. 1 claim, Rush Creek, Rush Creek deposit, Big Creek-Rush Creek District, Fresno Co., California, USA
© Caltech

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Formula:
Ba
 
21
Ca(Fe
2+
 
,Mn,Ti)
 
4
(Ti,Fe,Mg)
 
12
(Si
 
12
O
 
36
)(Si
 
2
O
 
7
)
 
6
(O,OH)
 
30
Cl
 
6
·14H
 
2
O
System:HexagonalColour:Red-brown
Hardness:5
Name:Named after John Boardman Trask (1824-1879), state geologist of California.
This page provides mineralogical data about Traskite.

Classification of Traskite

IMA status:Approved 1964
Strunz 8th edition ID:8/E.20-20
Nickel-Strunz 10th (pending) edition ID:9.CP.05

9 : SILICATES (Germanates)
C : Cyclosilicates
P : 12-membered and larger rings
Dana 8th edition ID:64.5.1.1

64 : CYCLOSILICATES Rings with Other Anions and Insular Silicate Groups
5 : Rings with Other Anions and Insular Silicate Groups: 12-membered rings with [Si2O7] dimers
Hey's CIM Ref.:17.3.17

17 : Silicates Containing other Anions
3 : Silicates with chloride (including aluminosilicates)
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Type Occurrence of Traskite

Type Locality:Esquire No. 1 claim, Rush Creek, Rush Creek deposit, Big Creek-Rush Creek District, Fresno Co., California, USA
Year of Discovery:1965

Physical Properties of Traskite

Lustre:Vitreous
Colour:Red-brown
Streak:light red-brown
Hardness (Mohs):5

Crystallography of Traskite

Crystal System:Hexagonal
Cell Parameters:a = 17.89Å, c = 12.33Å
Ratio:a:c = 1 : 0.689
Unit Cell Volume:V 3,417.55 ų (Calculated from Unit Cell)

Optical Data of Traskite

Type:Uniaxial (-)
RI values: nω = 1.714 nε = 1.702
Maximum Birefringence:δ = 0.012

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High

Chemical Properties of Traskite

Formula:
Ba
 
21
Ca(Fe
2+
 
,Mn,Ti)
 
4
(Ti,Fe,Mg)
 
12
(Si
 
12
O
 
36
)(Si
 
2
O
 
7
)
 
6
(O,OH)
 
30
Cl
 
6
·14H
 
2
O
Essential elements:Ba, Ca, Cl, Fe, H, O, Si, Ti
All elements listed in formula:Ba, Ca, Cl, Fe, H, Mg, Mn, O, Si, Ti
Common Impurities:Al,Mn,Mg,Ca,Sr,K

Relationship of Traskite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.CP.10Megacyclite
Na
 
8
KSi
 
9
O
 
18
(OH)
 
9
·19H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
17.3.1Rustumite
Ca
 
10
(Si
 
2
O
 
7
)
 
2
(SiO
 
4
)Cl
 
2
(OH)
 
2
17.3.2Zunyite
Al
 
13
Si
 
5
O
 
20
(OH,F)
 
18
Cl
17.3.3Sodalite
Na
 
8
[Cl
 
2
|Al
 
6
Si
 
6
O
 
24
]
17.3.4Marialite
Na
 
4
[Cl|(AlSi
 
3
O
 
8
)
 
3
]
17.3.5Tugtupite
Na
 
4
[Cl|BeAlSi
 
4
O
 
12
]
17.3.6Eudialyte
Na
 
15
Ca
 
6
(Fe
2+
 
,Mn
2+
 
)
 
3
Zr
 
3
[Si
 
25
O
 
73
](O,OH,H
 
2
O)
 
3
(OH,Cl)
 
2
17.3.7Alluaivite
Na
 
19
(Ca,Mn)
 
6
(Ti,Nb)
 
3
Si
 
26
O
 
74
Cl·2H
 
2
O
17.3.8Nasonite
Pb
 
6
Ca
 
4
[Cl
 
2
|(Si
 
2
O
 
7
)
 
3
]
17.3.9Asisite
Pb
 
7
[O
 
4
|SiO
 
4
|Cl
 
2
]
17.3.10Jagoite
(Pb,Ca)
 
3
FeSi
 
3
O
 
10
(Cl,OH)
17.3.11Friedelite
(Mn,Fe)
 
8
Si
 
6
O
 
15
(OH,Cl)
 
10
17.3.12Pyrosmalite-(Fe)
(Fe,Mn)
 
8
Si
 
6
O
 
15
(OH,Cl)
 
10
17.3.13Pyrosmalite
(Fe,Mn)
 
8
Si
 
16
O
 
15
(OH,Cl)
 
10
17.3.14Pyrosmalite-(Mn)
(Mn,Fe)
 
8
Si
 
6
O
 
15
(OH,Cl)
 
10
17.3.16Mcgillite
(Mn,Fe)
 
8
Si
 
6
O
 
15
(OH)
 
8
Cl
 
2
17.3.18Muirite
Ba
 
10
Ca
 
2
Mn
2+
 
Ti[(OH,Cl,F)|HSi
 
2
O
 
7
]
 
5
17.3.19Verplanckite
Ba
 
2
(Mn,Fe,Ti)Si
 
2
O
 
6
(O,OH,Cl,F)
 
2
·3H
 
2
O or near

Other Names for Traskite

Synonyms:
IMA1964-014
Other Languages:
German:Traskit
Russian:Траскит
Spanish:Traskita

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 Traskite

Reference List:Alfors, J.T., M.C. Stinson, R.A. Matthews & A. Pabst (1965), Seven new barium minerals from eastern Fresno County, California: American Mineralogist: 50: 314-340.

Alfors, J.T. & G.W. Putnam (1965), Revised chemical analyses of traskite, verplanckite and muirite from Fresno County, California: American Mineralogist: 50: 1500-1503.

Soviet Physics – Doklady (1976): 426.

Internet Links for Traskite

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    Localities for Traskite

    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.
    Slovakia
     
    • Košice Region
      • Southern Slanské Mts
    		Koděra, P., Rojkovičová, Ľ.,Košárková, M., 1998: Mineralógická správa lokality Byšta, Au-Ag. Manuscript, Archiv Geofond, Bratislava, 68 p
    USA
     
    • California
      • Fresno Co.
        • Big Creek-Rush Creek District
          • Rush Creek deposit
            • Big Creek
            • Rush Creek
    		Mineralogical Record (2002): 33: 163.
    Mineral and/or Locality
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