Strontioborite Mineral Data

General Strontioborite Information

Chemical Formula:

SrB8O11(OH)4

Composition:

Molecular Weight = 418.12 gm

Strontium 20.96 % Sr 24.78 % SrO

Boron 20.68 % B 66.60 % B₂O₃

Hydrogen 0.96 % H 8.62 % H₂O

Oxygen 57.40 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

SrB₈O₁₁(OH)₄

Environment:

In rock salt.

IMA Status:

Approved IMA 1960

Locality:

Caspian region, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the composition.

Name Pronunciation:

Strontioborite

Synonym:

ICSD 4228

PDF 18-1285

Strontioborite Crystallography

Axial Ratios:

a:b:c =1.1958:1:0.9184

Cell Dimensions:

a = 9.83, b = 8.22, c = 7.55, Z = 2; beta = 107.766° V = 580.97 Den(Calc)= 2.39

Crystal System:

Monoclinic - Sphenoidal H-M Symbol (2) Space Group: P 2₁

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

By Intensity(I/I_o): 7.2(1), 4.09(0.9), 3.29(0.8),

Physical Properties of Strontioborite

Color:

Colorless.

Density:

2.806

Diaphaneity:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

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

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Strontioborite

Gladstone-Dale:

CI meas= 0.111 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.043 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2174,KPDmeas= 0.1852,KC= 0.2084
Ncalc = 1.5 - 1.58

Optical Data:

Biaxial (+/-), a=1.47, b=1.51, g=1.579, bire=0.1090, 2V(Calc)=78, 2V(Meas)=85.

Calculated Properties of Strontioborite

Electron Density:

Bulk Density (Electron Density)=2.31 gm/cc
note: Specific Gravity of Strontioborite =2.39 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

PE_{Strontioborite}= 23.17 barns/electron
U=PE_{Strontioborite} x rElectron Density= 53.50 barns/cc.

Radioactivity:

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

Strontioborite Classification

Dana Class:

25.06.03.01 (25)Anhydrous Borates Containing Hydroxyl or Halogen

(25.06)Dana Type

(25.06.03)Dana Group

25.06.03.01 Strontioborite SrB8O11(OH)4 P 2₁ 2

Strunz Class:

06.FC.10 06 - BORATES

06.F - Hexaborates

06.FC -Phyllo-hexaborates

06.FC.10 Strontioborite SrB8O11(OH)4 P 2₁ 2

Other Strontioborite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Strontioborite :
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 Strontioborite Specimen Label here :

Strontioborite

SrB8O11(OH)4
Dana No: 25.06.03.01 Strunz No: 06.FC.10
Locality:

Notes:

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