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  

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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 X Ray Diffraction: By Intensity(I/I_o): 7.2(1), 4.09(0.9), 3.29(0.8), Crystal Structure:

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Brovkin A A , Zayakina N V , Brovkina V S , Soviet Physics Crystallography , 20 (1975) p.563-566, Crystal structure of strontioborite Sr[B8O11(OH)4]

 

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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