Sanbornite Mineral Data

Sanbornite Mineral Data +

General Sanbornite Information

Chemical Formula:

BaSi2O5

Composition:

Molecular Weight = 273.50 gm

Barium 50.21 % Ba 56.06 % BaO

Silicon 20.54 % Si 43.94 % SiO₂

Oxygen 29.25 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ba(Si₂O₅)

Environment:

beta-BaSi2O5 is a high temperature phase. Major component of Ba-silicate assemblages at or near fringes of large granite intrusives.

IMA Status:

Valid Species (Pre-IMA) 1932

Locality:

Incline sanbornite deposit, Truball Peak, 4 miles WNW of Incline, Mariposa Co, California. Link to MinDat.org Location Data.

Name Origin:

Named for Frank B. Sanborn, (1862-1936), Mineralogist, California Department of Natural Resources.

Synonym:

ICSD 100313

PDF 26-176

Sanbornite Image

Images:

Sanbornite Muirite

Comments: Translucent orange crystalline muirite in sanbornite.
Location: Big Creek, Fresno County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Sanbornite

Comments: Micaceous sanbornite.
Location: Esquire No. 1 Mine, Big Creek, Fresno County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Sanbornite Traskite

Comments: Orange translucent crystalline traskite in white sanbornite.
Location: Rush Creek, Fresno County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Sanbornite Bazirite

Comments: Clear glassy minute grains of bazinite to 1mm through out matrix of milky-white sanbornite. The bazirite fluoresces light blue.
Location: Snow Cap mine, Rush Creek, Fresno Co., California, USA. Scale: 6.5 x 3 x 2.5cm.
© Tom Loomis / Dakota Matrix

Images:

Sanbornite Bigcreekite Gillespite

Comments: Tiny white, spherical patterns, halo-like crystals of bigcreekite to about 0.5mm and reddish gillespite in a matrix of pale yellowish sanbornite.
Location: Trumbull Peak, Mariposa Co., California, United States. Scale: 2.5 x 2 x 2cm.
© Tom Loomis / Dakota Matrix

Sanbornite Crystallography

Axial Ratios:

a:b:c =0.602:1:1.7594

Cell Dimensions:

a = 4.63, b = 7.69, c = 13.53, Z = 4; V = 481.73 Den(Calc)= 3.77

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmnb

Crystal Structure:

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Douglass R M , American Mineralogist , 43 (1958) p.517-536, The crystal structure of sanbornite, BaSi2O5

Physical Properties of Sanbornite

Cleavage:

[???] Perfect

Color:

Colorless, White.

Density:

3.74

Diaphaniety:

Transparent to Translucent

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Sanbornite

Gladstone-Dale:

CI meas= -0.004 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1624,KPDmeas= 0.1637,KC= 0.1632

Optical Data:

Biaxial (-), a=1.597, b=1.616, g=1.624, bire=0.0270, 2V(Calc)=64, 2V(Meas)=66.

Calculated Properties of Sanbornite

Electron Density:

r_electron=3.42 gm/cc
note: r_Sanbornite=3.77 gm/cc.

Fermion Index

Fermion Index = 0.09921
Boson Index = 0.90079

Photoelectric:

PE_Sanbornite= 222.81 barns/electron
U=PE_Sanbornite x r_electron= 761.70 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Sanbornite is Not Radioactive

Sanbornite Classification

Dana Class:

74.3.4.1 (74)Phyllosilicate Modulated Layers

(74.3)with joined strips

(74.3.4)Ba phyllosilicates

74.3.4.1 Sanbornite BaSi2O5 Pmnb 2/m 2/m 2/m

74.3.4.2 Krauskopfite BaSi2O4(OH)2·2(H2O) P 2₁/a 2/m

Strunz Class:

VIII/H.02-50 VIII - Silicates

VIII/H - Phyllosilicates (layered), Tetragonal or pseudotetragonal layered structures [Si4O10]4- and others

VIII/H.02 - Davanite - Dalyite series

VIII/H.02-10 Cuprorivaite CaCuSi4O10 P 4/nnc 4/m 2/m 2/m

VIII/H.02-20 Wesselsite! SrCuSi4O10 P 4/ncc 4/m 2/m 2/m

VIII/H.02-30 Effenbergerite BaCuSi4O10 P 4/nnc 4/m 2/m 2/m

VIII/H.02-40 Gillespite BaFeSi4O10 P 4/ncc 4/m 2/m 2/m

VIII/H.02-50 Sanbornite BaSi2O5 Pmnb 2/m 2/m 2/m

VIII/H.02-60 Bigcreekite! BaSi2O5·4(H2O) P nma 2/m 2/m 2/m

Other Sanbornite Information

References:

NAME( MinRec) PHYS. PROP.(Larousse des Mineraux,1981) OPTIC PROP.(Dana8)

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

Sanbornite

BaSi2O5
Dana No: 74.3.4.1 Strunz No: VIII/H.02-50
Locality:

Notes: