Fresnoite Mineral Data

Fresnoite Mineral Data +

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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.

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 PyramidalH-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),

Crystal Structure:

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Moore P B , Louisnathan S J , Zeitschrift fur Kristallographie , 130 (1969) p.438-448, The crystal structure of fresnoite, Ba2(TiO)Si2O7, Positive polarity, Locality: sanbornite deposits of eastern Fresno County, California, USA

View Additional jPOWD Structure files for Fresnoite
[1]

Physical Properties of Fresnoite

Cleavage:

[001] Distinct

Color:

Greenish yellow, Lemon.

Density:

4.43

Hardness:

3-4 - Calcite-Fluorite

Luminescence:

Fluorescent.

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

Optical Data:

Uniaxial (-), e=1.765, w=1.775, bire=0.0100.

Calculated Properties of Fresnoite

Electron Density:

r_electron=3.95 gm/cc
note: r_Fresnoite=4.43 gm/cc.

Fermion Index

Fermion Index = 0.11411
Boson Index = 0.88589

Photoelectric:

PE_Fresnoite= 245.71 barns/electron
U=PE_Fresnoite x r_electron= 970.99 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Fresnoite is Not Radioactive

Fresnoite Classification

Dana Class:

55.4.2.1 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions

(55.4)with cations in [8] and lower coordination

(55.4.2)Fresnoite group

55.4.2.1 Fresnoite Ba2TiSi2O8 P 4bm 4mm

55.4.2.2 Hardystonite Ca2ZnSi2O7 P 42₁m 4 2m

55.4.2.3 Jeffreyite (Ca,Na)2(Be,Al)Si2(O,OH)7 C 222₁ 2 2 2

55.4.2.4 Leucophanite (Na,Ca)2BeSi2(O,OH,F)7 P1 1

55.4.2.5 Meliphanite (Ca,Na)2Be[(Si,Al)2O6(F,OH)] I 4 4

55.4.2.6 Gugiaite Ca2BeSi2O7 P 42₁m 4 2m

Strunz Class:

VIII/C.15-10 VIII - Silicates

VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F]

VIII/C.15 - Bafertisite series

VIII/C.15-10 Fresnoite Ba2TiSi2O8 P 4bm 4mm

VIII/C.15-20 Bafertisite Ba(Fe,Mn)2TiSi2O7(O,OH)2 Cm m

VIII/C.15-30 Hejtmanite Ba(Mn,Fe)2TiO(Si2O7)(OH,F)2 P 2₁/m 2/m

VIII/C.15-40 Delindeite Ba2(Na,K,[])3(Ti,Fe)[Ti2(O,OH)4Si4O14](H2O,OH)2 A2/m 2/m

Other Fresnoite Information

References:

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

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

Fresnoite

Ba2TiSi2O8
Dana No: 55.4.2.1 Strunz No: VIII/C.15-10
Locality:

Notes: