Traskite Mineral Data

Traskite Mineral Data +

General Traskite Information

Chemical Formula:

(Ba,Ca)9(Fe++,Mn)2Ti2(SiO3)12(OH,Cl,F)6·6(H2O)

Composition:

Molecular Weight = 2,552.58 gm

Barium 45.73 % Ba 51.06 % BaO

Strontium 0.34 % Sr 0.41 % SrO

Calcium 0.63 % Ca 0.88 % CaO

Magnesium 0.19 % Mg 0.32 % MgO

Titanium 3.38 % Ti 5.63 % TiO₂

Manganese 1.08 % Mn 1.39 % MnO

Aluminum 0.21 % Al 0.40 % Al₂O₃

Iron 3.28 % Fe 4.22 % FeO

Silicon 12.98 % Si 27.78 % SiO₂

Hydrogen 0.57 % H 5.08 % H₂O

Chlorine 3.47 % Cl 3.47 % Cl

- % Cl -0.78 % -O=Cl₂

Oxygen 27.77 % O

Fluorine 0.37 % F 0.37 % F

- % F -0.16 % -O=F₂

______ ______

100.00 % 100.06 % = TOTAL OXIDE

Empirical Formula:

Ba_8.5Ca_0.4Sr_0.1Fe²⁺_1.5Mn²⁺_0.5Mg_0.2Ti_1.8Si_11.8Al_0.2O_29.9(OH)_14.4Cl_2.5F_0.5

Environment:

Sanbornite-bearing metamorphic rocks along a granodiorite contact.

IMA Status:

Approved IMA 1965

Locality:

Big Creek - Rush Creek sanbornite deposit, 5 miles NE of Trimmer, Fresno Co., California. Link to MinDat.org Location Data.

Name Origin:

Named for John Boardman Trask (1824-1879), first state geologist of California.

Synonym:

ICSD 34076

PDF 18-171

Traskite Image

Images:

Traskite Sanbornite

Comments: Orange translucent crystalline traskite in white sanbornite.
Location: Rush Creek, Fresno County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Traskite Crystallography

Axial Ratios:

a:c = 1:0.68576

Cell Dimensions:

a = 17.98, c = 12.33, Z = 3; V = 3,452.02 Den(Calc)= 3.68

Crystal System:

Hexagonal - Ditrigonal DipyramidalH-M Symbol (6 m2) Space Group: P 6m2

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.96(1), 15.4(0.5), 3.51(0.4),

Crystal Structure:

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Malinovskii Yu A , Pobedimskaya E A , Belov N V , Doklady Akademii Nauk SSSR , 229 (1976) p.1101-1104, Crystal structure of traskite, Note: y(OH1) and z(OH1) adjusted to match reported bond lengths

Physical Properties of Traskite

Cleavage:

None

Color:

Brownish red.

Density:

3.71

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

light reddish brown

Optical Properties of Traskite

Dichroism (e):

colorless or pale yellow.

Dichroism (w):

brownish red or brownish red.

Gladstone-Dale:

CI meas= -0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.022 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1924,KPDmeas= 0.1908,KC= 0.1883

Optical Data:

Uniaxial (-), e=1.702, w=1.714, bire=0.0120.

Calculated Properties of Traskite

Electron Density:

r_electron=3.39 gm/cc
note: r_Traskite=3.71 gm/cc.

Fermion Index

Fermion Index = 0.09319
Boson Index = 0.90681

Photoelectric:

PE_Traskite= 204.04 barns/electron
U=PE_Traskite x r_electron= 690.92 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Traskite is Not Radioactive

Traskite Classification

Dana Class:

64.5.1.1 (64)Cyclosilicate Rings with Other Anions and Insular Silicate Groups

(64.5)12-membered rings with [Si2O7] dimers

(64.5.1)Dana Group

64.5.1.1 Traskite (Ba,Ca)9(Fe,Mn)2Ti2(SiO3)12(OH,Cl,F)6·6(H2O) P 6m2 6 m2

Strunz Class:

VIII/E.20-20 VIII - Silicates

VIII/E - Cyklosilicates, six rings [Si6O18]12-

VIII/E.20 - Tienshanite - Traskite series

VIII/E.20-05 Odintsovite K2Na4Ca3Ti2Be4Si12O38 F ddd 2/m 2/m 2/m

VIII/E.20-10 Tienshanite BaNa2MnTiB2Si6O20 P 6/m 6/m

VIII/E.20-20 Traskite (Ba,Ca)9(Fe,Mn)2Ti2(SiO3)12(OH,Cl,F)6·6(H2O) P 6m2 6 m2

Other Traskite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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Traskite

(Ba,Ca)9(Fe++,Mn)2Ti2(SiO3)12(OH,Cl,F)6·6(H2O)
Dana No: 64.5.1.1 Strunz No: VIII/E.20-20
Locality:

Notes: