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:

Ba₂TiSi₂O₈

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

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

By Intensity(I/I_o): 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:

PE_Fresnoite= 245.71 barns/electron
U=PE_Fresnoite x rElectron 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 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

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

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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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