Pabstite Mineral Data

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General Pabstite Information

Chemical Formula:

Ba(Sn,Ti)Si3O9

Composition:

Molecular Weight = 466.58 gm

Barium 29.43 % Ba 32.86 % BaO

Titanium 2.57 % Ti 4.28 % TiO₂

Silicon 18.06 % Si 38.63 % SiO₂

Tin 19.08 % Sn 24.23 % SnO₂

Oxygen 30.86 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BaSn_0.75Ti_0.25Si₃O₉

Environment:

Recrystallized siliceous limestone with Sn sulfides.

IMA Status:

Approved IMA 1965

Locality:

Kalkar quarry, north of Santa Cruz, Santa Cruz Co., California. Link to MinDat.org Location Data.

Name Origin:

Named for Adolph Pabst (1899-1990), American mineralogist, University of California at Berekey

Name Pronunciation:

Pabstite

Synonym:

ICSD 10385

PDF 43-633

Pabstite Image

Images:

Pabstite

Comments: Pabstite grains in matrix. It is essentially the tin analog of benitoite with tin replacing titanium in the formula 3:1. Pabstite fluoresces under SW UV light as seen in the photo.
Location: Kalkar Quarry, Santa Cruz County, California, USA. Scale: 4.5 x 3 cm.
© John Veevaert

Pabstite Crystallography

Axial Ratios:

a:c = 1:1.4657

Cell Dimensions:

a = 6.706, c = 9.829, Z = 2; V = 382.80 Den(Calc)= 4.05

Crystal System:

Hexagonal - Ditrigonal DipyramidalH-M Symbol (6 m2) Space Group: P 6c2

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

By Intensity(I/I_o): 3.77(1), 2.78(0.9), 3.37(0.5),

Crystal Structure:

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Hawthorne F C , Neues Jahrbuch fur Mineralogie, Monatshefte , 1987 (1987) p.16-30, The crystal chemistry of the benitoite group minerals and, structural relations in (Si3O9) ring structures, Sample: occurs in small fractures and as scattered grains in, recrystallized siliceous limestone at Santa Cruz, Ca

Physical Properties of Pabstite

Color:

Colorless, White.

Density:

4.03

Diaphaneity:

Transparent to Translucent

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Hardness:

6 - Orthoclase

Luminescence:

Fluorescent, Short UV=bright blue.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Pabstite

Dichroism (e):

colorless.

Dichroism (w):

colorless.

Gladstone-Dale:

CI meas= 0.03 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.035 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1678,KPDmeas= 0.1686,KC= 0.1739
Ncalc = 1.7

Optical Data:

Uniaxial (-), e=1.674, w=1.685, bire=0.0110.

Calculated Properties of Pabstite

Electron Density:

Bulk Density (Electron Density)=3.68 gm/cc
note: Specific Gravity of Pabstite =4.03 gm/cc.

Fermion Index:

Fermion Index = 0.09
Boson Index = 0.91

Photoelectric:

PE_Pabstite= 187.97 barns/electron
U=PE_Pabstite x rElectron Density= 691.62 barns/cc.

Radioactivity:

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

Pabstite Classification

Dana Class:

59.01.01.03 (59)Cyclosilicate Three-Membered Rings

(59.01)anhydrous, no other anions

(59.01.01)Benitoite group

59.01.01.01 Bazirite BaZrSi3O9 P 6m2 6 m2

59.01.01.02 Benitoite BaTiSi3O9 P 6c2 6 m2

59.01.01.03 Pabstite Ba(Sn,Ti)Si3O9 P 6c2 6 m2

59.01.01.04 Wadeite K2ZrSi3O9 P 6₃/m 6/m

Strunz Class:

09.CA.05 09 - SILICATES (Germanates)

09.C - Cyclosilicates

09.CA -[Si3O9]6- 3-membered single rings (dreier-Einfachringe),

09.CA.05 Bazirite BaZrSi3O9 P 6m2 6 m2

09.CA.05 Benitoite BaTiSi3O9 P 6c2 6 m2

09.CA.05 Pabstite Ba(Sn,Ti)Si3O9 P 6c2 6 m2

Other Pabstite Information

References:

NAME( MinRec) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

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

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

Pabstite

Ba(Sn,Ti)Si3O9
Dana No: 59.01.01.03 Strunz No: 09.CA.05
Locality:

Notes: