Sanbornite Mineral Data (original) (raw)

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.

Name Pronunciation:

Sanbornite + Pronunciation

Synonym:

ICSD 100313

PDF 26-176

Sanbornite Image

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

Images:

Sanbornite Alforsite Titantaramellite Celsian Comments: SEM image showing alforsite (al). Matrix composed by lamellar sanbornite (sa) and granular quartz (q). Rectangular crystal in the upper right corner is titantaramellite (ti) and isometric crystals included in sanbornite are celsian (ce). Location: Trumbull Peak, near Incline, Mariposa Co., California, USA.Scale: See Image. © Pavel M. Kartashov

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
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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

Diaphaneity:

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
Ncalc = 1.61 - 1.62

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:

Bulk Density (Electron Density)=3.42 gm/cc
note: Specific Gravity of Sanbornite =3.77 gm/cc.

Fermion Index:

Fermion Index = 0.09
Boson Index = 0.91

Photoelectric:

PESanbornite = 222.81 barns/electron
U=PESanbornite x rElectron Density= 761.70 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Sanbornite is Not Radioactive

Sanbornite Classification

Dana Class:

74.03.04.01 (74)Phyllosilicate Modulated Layers

(74.03)with joined strips

(74.03.04)Ba phyllosilicates

74.03.04.01 Sanbornite BaSi2O5 Pmnb 2/m 2/m 2/m

74.03.04.02 Krauskopfite BaSi2O4(OH)2•2(H2O) P 21/a 2/m

Strunz Class:

09.EF.10 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EF -Single nets with 6-membered rings, � other rings

09.EF.10 Sanbornite BaSi2O5 Pmnb 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: 74.03.04.01 Strunz No: 09.EF.10
Locality:

Notes: