Pabstite Mineral Data

Pabstite Mineral Data
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General Pabstite Information

Help on Chemical Formula: Chemical Formula: Ba(Sn,Ti)Si3O9
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: BaSn0.75Ti0.25Si3O9
Help on Environment: Environment: Recrystallized siliceous limestone with Sn sulfides.
Help on IMA Status: IMA Status: Approved IMA 1965
Help on Locality: Locality: Kalkar quarry, north of Santa Cruz, Santa Cruz Co., California. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Adolph Pabst (1899-1990), American mineralogist, University of California at Berekey
Help on Name Pronunciation: Name Pronunciation: Pabstite Say PABSTITE
Help on Synonym: Synonym: ICSD 10385
  PDF 43-633
 

Pabstite Image

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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
Help on Axial Ratios: Axial Ratios: a:c = 1:1.4657
Help on Cell Dimensions: Cell Dimensions: a = 6.706, c = 9.829, Z = 2; V = 382.80 Den(Calc)= 4.05
Help on Crystal System: Crystal System: Hexagonal - Ditrigonal DipyramidalH-M Symbol (6 m2) Space Group: P 6c2
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.77(1), 2.78(0.9), 3.37(0.5),
Click Here for Large Pabstite Structure Window 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

Help on Color: Color: Colorless, White.
Help on Density: Density: 4.03
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luminescence: Luminescence: Fluorescent, Short UV=bright blue.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Pabstite

Help on Dichroism (e): Dichroism (e): colorless.
Help on Dichroism (w): Dichroism (w): colorless.
Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (-), e=1.674, w=1.685, bire=0.0110.
 

Calculated Properties of Pabstite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.68 gm/cc
note: Specific Gravity of Pabstite =4.03 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.09
Boson Index = 0.91
Help on Photoelectric: Photoelectric: PEPabstite = 187.97 barns/electron
U=PEPabstite x rElectron Density= 691.62 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pabstite is Not Radioactive
 

Pabstite Classification
Help on Dana Class: 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
Help on Strunz Class: 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
Help on References: References: NAME( MinRec) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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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Pabstite

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

 

Notes: