Traskite Mineral Data

Mineral of the Month Club - An Inexpensive Way to Enjoy Minerals

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.

Name Pronunciation:

Traskite

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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
Ncalc = 1.69 - 1.7

Optical Data:

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

Calculated Properties of Traskite

Electron Density:

Bulk Density (Electron Density)=3.39 gm/cc
note: Specific Gravity of Traskite =3.71 gm/cc.

Fermion Index:

Fermion Index = 0.09
Boson Index = 0.91

Photoelectric:

PE_Traskite= 204.04 barns/electron
U=PE_Traskite x rElectron Density= 690.92 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Traskite is Not Radioactive

Traskite Classification

Dana Class:

64.05.01.01 (64)Cyclosilicates

(64.05)12-membered rings with [Si2O7] dimers

(64.05.01)Dana Group

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

Strunz Class:

09.CP.05 09 - SILICATES (Germanates)

09.C - Cyclosilicates

09.CP -12-membered and larger rings

09.CP.05 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)

See Also:

Links to other databases for Traskite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - CalTech Mineral Spectroscopy
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - MinMax(Deutsch)
12 - MinMax(English)
13 - Mineralienatlas (Deutsch)
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

Search for Traskite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Traskite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Traskite Mineral Data :

Ask about Traskite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Traskite Specimen Label here :

Traskite

(Ba,Ca)9(Fe++,Mn)2Ti2(SiO3)12(OH,Cl,F)6•6(H2O)
Dana No: 64.05.01.01 Strunz No: 09.CP.05
Locality:

Notes: