Strontioborite Mineral Data

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

IMA Status:

Approved IMA 1960

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 4228

PDF 18-1285

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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 - SphenoidalH-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

Diaphaniety:

Transparent

Fracture:

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

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

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:

r_electron=2.31 gm/cc
note: r_{Strontioborite}=2.39 gm/cc.

Fermion Index

Fermion Index = 0.0561
Boson Index = 0.9439

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Strontioborite is Not Radioactive

Strontioborite Classification

Dana Class:

25.6.3.1 (25)Anhydrous Borates Containing Hydroxyl or Halogen

(25.6)Dana Type

(25.6.3)Dana Group

25.6.3.1 Strontioborite SrB8O11(OH)4 P 2₁ 2

Strunz Class:

V/K.07-30 V - Nitrates, Carbonates and Borates

V/K - Layered borates with complex groups [Bx(O,OH)y]

V/K.07 - Ginorite - Strontioborite series

V/K.07-10 Ginorite Ca2B14O23·8(H2O) P 2₁/c 2/m

V/K.07-20 Strontioginorite (Sr,Ca)2B14O23·8(H2O) P 2₁/a 2/m

V/K.07-30 Strontioborite SrB8O11(OH)4 P 2₁ 2

Other Strontioborite Information

References:

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Strontioborite

SrB8O11(OH)4
Dana No: 25.6.3.1 Strunz No: V/K.07-30
Locality:

Notes: