Mineralogy Database

Fresnoite Mineral Data

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General Fresnoite Information

Help on Chemical  Formula: Chemical Formula: Ba2TiSi2O8
Help on Composition: Composition: Molecular Weight = 506.70 gm
   Barium    54.20 %  Ba   60.52 % BaO
   Titanium   9.45 %  Ti   15.76 % TiO2
   Silicon   11.09 %  Si   23.72 % SiO2
   Oxygen    25.26 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ba2TiSi2O8
Help on IMA Status: IMA Status: Approved IMA 1965
Help on Locality: Locality: Big Creek - Rush Creek sanbornite deposit, 5 miles NE of Trimmer, Fresno Co. California. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after it's locality.
Help on Name Pronunciation: Name Pronunciation: Fresnoite + Pronunciation Say FRESNOITE
Help on Synonym: Synonym: ICSD 201844
  PDF 22-513
 

Fresnoite Image

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  Fresnoite

Comments: Yellow to peach colored crystals of fresnoite.
Location: Junnila Mine, San Benito County, California, USA. Scale: Crystal size 5 mm.
© John Veevaert

Fresnoite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.61096
Help on Cell Dimensions: Cell Dimensions: a = 8.5291, c = 5.211, Z = 2; V = 379.08 Den(Calc)= 4.44
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Pyramidal H-M Symbol (4mm) Space Group: P 4bm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.077(1), 3.301(0.45), 2.697(0.25),
 

Physical Properties of Fresnoite

Help on Cleavage: Cleavage: {001} Distinct
Help on Color: Color: Greenish yellow, Lemon.
Help on Density: Density: 4.43
Help on Hardness: Hardness: 3-4 - Calcite-Fluorite
Help on Luminescence: Luminescence: Fluorescent, Short UV=yellow.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Fresnoite

Help on Dichroism (e): Dichroism (e): colorless.
Help on Dichroism (w): Dichroism (w): colorless.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.079 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.081 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1734,KPDmeas= 0.1738,KC= 0.1887
Ncalc = 1.84
Help on Optical Data: Optical Data: Uniaxial (-), e=1.765, w=1.775, bire=0.0100.
 

Calculated Properties of Fresnoite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.95 gm/cc
note: Specific Gravity of Fresnoite =4.43 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.11
Boson Index = 0.89
Help on Photoelectric: Photoelectric: PEFresnoite = 245.71 barns/electron
U=PEFresnoite x rElectron Density= 970.99 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Fresnoite is Not Radioactive
 

Fresnoite Classification

Help on  Dana Class: Dana Class: 55.04.02.01 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions
  (55.04)with cations in [8] and lower coordination
  (55.04.02)Fresnoite group
 
55.04.02.01 Fresnoite Ba2TiSi2O8 P 4bm 4mm
 
55.04.02.02 Hardystonite Ca2ZnSi2O7 P 421m 4 2m
 
55.04.02.03 Jeffreyite (Ca,Na)2(Be,Al)Si2(O,OH)7 C 2221 2 2 2
 
55.04.02.04 Leucophanite (Na,Ca)2BeSi2(O,OH,F)7 P1 1
 
55.04.02.05 Meliphanite (Ca,Na)2Be[(Si,Al)2O6(F,OH)] I 4 4
 
55.04.02.06 Gugiaite Ca2BeSi2O7 P 421m 4 2m
Help on  Strunz Class: Strunz Class: 09.BE.15 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
 
09.BE.15 Fresnoite Ba2TiSi2O8 P 4bm 4mm
 

Other Fresnoite 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 Fresnoite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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

Fresnoite

Ba2TiSi2O8
Dana No: 55.04.02.01 Strunz No: 09.BE.15
Locality:

 

Notes:

 

 
   
 


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