Sborgite Mineral Data

General Sborgite Information

Chemical Formula:

NaB5O6(OH)4•3(H2O)

Composition:

Molecular Weight = 295.11 gm

Sodium 7.79 % Na 10.50 % Na₂O

Boron 18.32 % B 58.98 % B₂O₃

Hydrogen 3.42 % H 30.52 % H₂O

Oxygen 70.48 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaB₅O₆(OH)₄•3(H₂O)

Environment:

Pipe scale at a reduction works for borates from hot spring lagoons, between 32 deg C and 60 deg C.

IMA Status:

Valid Species (Pre-IMA) 1957

Locality:

Larderello, Val di Cecina, Tuscany, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for Umberto Sborgi (1883-1955), Italian chemist, University of Milan, Milan, Italy.

Name Pronunciation:

Sborgite

Synonym:

ICSD 2849

PDF 24-1056

Sborgite Image

Images:

Sborgite

Comments: Pale grayish-green massive sborgite.
Location: Furnace Creek borate area, Death Valley, Inyo County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Sborgite Crystallography

Axial Ratios:

a:b:c =0.6788:1:0.8311

Cell Dimensions:

a = 11.1, b = 16.35, c = 13.59, Z = 8; beta = 113.167° V = 2,267.50 Den(Calc)= 1.73

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 4.6(1), 3.3(0.77), 3.2(0.76),

Physical Properties of Sborgite

Color:

Colorless.

Density:

1.713

Diaphaneity:

Transparent

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Sborgite

Gladstone-Dale:

CI meas= -0.069 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.058 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2651,KPDmeas= 0.2678,KC= 0.2505
Ncalc = 1.43

Optical Data:

Biaxial (+), a=1.431, b=1.438, g=1.507, bire=0.0760, 2V(Calc)=38, 2V(Meas)=35.

Calculated Properties of Sborgite

Electron Density:

Bulk Density (Electron Density)=1.76 gm/cc
note: Specific Gravity of Sborgite =1.73 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Sborgite= 0.43 barns/electron
U=PE_Sborgite x rElectron Density= 0.75 barns/cc.

Radioactivity:

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

Sborgite Classification

Dana Class:

26.05.01.01 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.05)Dana Type

(26.05.01)Dana Group

26.05.01.01 Sborgite NaB5O6(OH)4•3(H2O) C 2/c 2/m

Strunz Class:

06.EA.05 06 - BORATES

06.E - Pentaborates

06.EA -Neso-pentaborates

06.EA.05 Sborgite NaB5O6(OH)4•3(H2O) C 2/c 2/m

Other Sborgite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Sborgite :
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 Sborgite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Sborgite :

Ask about Sborgite 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 Español

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

Sborgite

NaB5O6(OH)4•3(H2O)
Dana No: 26.05.01.01 Strunz No: 06.EA.05
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.