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Traskite

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About TraskiteHide

John Boardman Trask
Formula:
Ba21Ca(Fe2+,Mn,Ti)4(Ti,Fe,Mg)12(Si12O36)(Si2O7)6(O,OH)30Cl6·14H2O
Colour:
Red-brown
Lustre:
Vitreous
Hardness:
5
Specific Gravity:
3.71
Crystal System:
Hexagonal
Name:
Named in honor of John Boardman Trask (27 May 1824, Roxbury, Massachusetts, USA - 3 Jul 1879, San Francisco, California, USA), physician and the first state geologist of California.
This page provides mineralogical data about Traskite.


Classification of TraskiteHide

Approved
Approval Year:
1964
First Published:
1965
9.CP.05

9 : SILICATES (Germanates)
C : Cyclosilicates
P : 12-membered and larger rings
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
17.3.17

17 : Silicates Containing other Anions
3 : Silicates with chloride (including aluminosilicates)

Physical Properties of TraskiteHide

Vitreous
Colour:
Red-brown
Streak:
light red-brown
Hardness:
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
3.71(2) g/cm3 (Measured)    

Optical Data of TraskiteHide

Type:
Uniaxial (-)
RI values:
nω = 1.714 nε = 1.702
Max Birefringence:
δ = 0.012
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Comments:
Brownish-red to colorless.

Chemical Properties of TraskiteHide

Formula:
Ba21Ca(Fe2+,Mn,Ti)4(Ti,Fe,Mg)12(Si12O36)(Si2O7)6(O,OH)30Cl6·14H2O
IMA Formula:
Ba21Ca(Fe2+,Mn,Ti)4(Ti,Fe,Mg)12(Si12O36)(Si2O7)6(O,OH)30Cl6 · 14H2O
Common Impurities:
Al,Mn,Mg,Ca,Sr,K

Crystallography of TraskiteHide

Crystal System:
Hexagonal
Cell Parameters:
a = 17.89 Å, c = 12.33 Å
Ratio:
a:c = 1 : 0.689
Unit Cell V:
3,417.55 ų (Calculated from Unit Cell)
Morphology:
Generally anhedral grains. Euhedral crystals show the forms {0001} and {10-10} prominently, but many tiny pyramid faces occur on some crystals. Tentative forms include {ll-22}, (41-52), and (61-71).

Type Occurrence of TraskiteHide

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

Synonyms of TraskiteHide

Other Language Names for TraskiteHide

German:Traskit
Simplified Chinese:硅钛铁钡石
Spanish:Traskita
Traditional Chinese:矽鈦鐵鋇石

Common AssociatesHide

Associated Minerals Based on Photo Data:
Sanbornite2 photos of Traskite associated with Sanbornite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.CP.10MegacycliteNa8KSi9O18(OH)9 · 19H2OMon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

17.3.1RustumiteCa10(Si2O7)2(SiO4)(OH)2Cl2Mon.
17.3.2ZunyiteAl13Si5O20(OH,F)18ClIso. 4 3m : F4 3m
17.3.3SodaliteNa8(Al6Si6O24)Cl2Iso. 4 3m : P4 3n
17.3.4MarialiteNa4Al3Si9O24ClTet. 4/m : I4/m
17.3.5TugtupiteNa4BeAlSi4O12ClTet. 4 : I4
17.3.6EudialyteNa15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2Trig. 3m (3 2/m) : R3m
17.3.7AlluaiviteNa19(Ca,Mn)6(Ti,Nb)3Si26O74Cl · 2H2OTrig. 3m (3 2/m) : R3m
17.3.8NasonitePb6Ca4(Si2O7)3Cl2Hex.
17.3.9AsisitePb7SiO9Cl2 Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
17.3.10JagoitePb18Fe3+4[Si4(Si,Fe3+)6][Pb4Si16(Si,Fe)4]O82Cl6Hex.
17.3.11FriedeliteMn2+8Si6O15(OH,Cl)10Mon. 2/m : B2/m
17.3.12Pyrosmalite-(Fe)Fe2+8Si6O15(OH,Cl)10Trig. 3m (3 2/m) : P3m1
17.3.13Pyrosmalite
17.3.14Pyrosmalite-(Mn)Mn2+8Si6O15(OH,Cl)10Trig.
17.3.16Mcgillite(Mn,Fe)8Si6O15(OH)8Cl2Mon. 2/m : B2/m
17.3.18MuiriteBa10Ca2Mn2+Ti[(OH,Cl,F)|HSi2O7]5Tet. 4/mmm (4/m 2/m 2/m) : P4/mmm
17.3.19VerplanckiteBa2(Mn,Fe,Ti)Si2O6(O,OH,Cl,F)2 · 3H2O or nearHex.

Fluorescence of TraskiteHide

None observed

Other InformationHide

Thermal Behaviour:
Gives off water in a closed tube test.

Rapidly heated to 900 C in an electric furnace, the mineral turns light brown. At 1200 C the mineral melts completely to a straw yellow glass.
Notes:
Insoluble in dilute acids and bases. On prolonged standing in dilute hydrochloric acid, the mineral turns almost opaque brown and loses its glassy appearance.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for TraskiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Alfors, J.T., Stinson, M.C., Matthews, R.A., and Pabst, A. (1965) Seven new barium minerals from eastern Fresno County, California. American Mineralogist: 50: 314-340.
Alfors, J.T. and Putnam, G.W. (1965) Revised chemical analyses of traskite, verplanckite and muirite from Fresno County, California: American Mineralogist: 50: 1500-1503.
Malinovskii, Y.A., Pobedimskaya, E.A., Belov, N.V. (1976) Crystal structure of traskite. Doklady Akademii Nauk SSSR: 229: 1101-1104.
Malinovskii, Y.A., Pobedimskaya, E.A., Belov, N.V. (1976) Crystal structure of traskite. Soviet Physics - Doklady: 21: 426-428.

Internet Links for TraskiteHide

Localities for TraskiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Slovakia
 
  • Košice Region
    • Trebišov Co.
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.; Jambor, J.L. and Roberts, A.C. (2002) New mineral names. American Mineralogist: 87: 765-768.
Mineral and/or Locality  
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