Fresnoite Mineral Data
General Fresnoite Information
Chemical Formula:
Ba2TiSi2O8
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
Empirical Formula:
Ba2 TiSi2 O8
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 after it's locality.
Name Pronunciation:
Fresnoite + Pronunciation
Synonym:
ICSD 201844
PDF 22-513
Fresnoite Image
Images:
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
Axial Ratios:
a:c = 1:0.61096
Cell Dimensions:
a = 8.5291, c = 5.211, Z = 2; V = 379.08 Den(Calc)= 4.44
Crystal System:
Tetragonal - Ditetragonal Pyramidal H-M Symbol (4mm) Space Group: P 4bm
X Ray Diffraction:
By Intensity(I/Io ): 3.077(1), 3.301(0.45), 2.697(0.25),
Physical Properties of Fresnoite
Cleavage:
{001} Distinct
Color:
Greenish yellow, Lemon.
Density:
4.43
Hardness:
3-4 - Calcite-Fluorite
Luminescence:
Fluorescent, Short UV=yellow.
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Fresnoite
Dichroism (e):
colorless.
Dichroism (w):
colorless.
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
Optical Data:
Uniaxial (-), e=1.765, w=1.775, bire=0.0100.
Calculated Properties of Fresnoite
Electron Density:
Bulk Density (Electron Density)=3.95 gm/cc note: Specific Gravity of Fresnoite =4.43 gm/cc.
Fermion Index:
Fermion Index = 0.11 Boson Index = 0.89
Photoelectric:
PEFresnoite = 245.71 barns/electronU=PEFresnoite x r Electron Density= 970.99 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Fresnoite is Not Radioactive
Fresnoite Classification
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 4 21 m 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 4 21 m 4 2m
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
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 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
Search for Fresnoite using:
[AOL ]
[Bing ]
[Dog Pile ]
[GeoScienceWorld ]
[HotBot ]
[Ixquick ]
[Lycos ]
[MAMMA ]
[Scirus ]
[Teoma ]
[WebCrawler ]
[Wikipedia ]
[YAHOO ]
Visit our Advertisers for Fresnoite :
Ask about Fresnoite 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
Espa�ol
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:
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.