Chambersite Mineral Data

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General Chambersite Information

Chemical Formula:

Mn3B7O13Cl

Composition:

Molecular Weight = 483.93 gm

Manganese 34.06 % Mn 43.98 % MnO

Boron 15.64 % B 50.35 % B₂O₃

Chlorine 7.33 % Cl 7.33 % Cl

- % Cl -1.65 % -O=Cl₂

Oxygen 42.98 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₃B₇O₁₃Cl

Environment:

Insoluble borate obtained from mining rock salt in a shallow salt dome mine.

IMA Status:

Approved IMA 1962

Locality:

Barber's Hill salt dome, Chambers County, Texas, USA. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Chambersite + Pronunciation

Synonym:

ICSD 402906

PDF 14-638

Chambersite Image

Images:

Chambersite

Comments: Tetragonal crystals of chambersite extracted from salt dome deposits.
Location: Barkers Hill, Mont Belvieu, Chambers County, Texas, USA. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Chambersite Crystallography

Axial Ratios:

a:b:c =1:1:1.4124

Cell Dimensions:

a = 8.68, b = 8.68, c = 12.26, Z = 4; V = 923.70 Den(Calc)= 3.48

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: P ca2₁

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

By Intensity(I/I_o): 3.07(1), 2.08(0.6), 2.74(0.6),

Crystal Structure:

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Kubel F , Crottaz O , Zeitschrift fur Kristallographie , 211 (1996) p.924-924, Crystal structure of manganese chlorine boracite, Mn3B7O13Cl, Locality: synthetic

Physical Properties of Chambersite

Cleavage:

None

Color:

Colorless, Purple red.

Density:

3.49

Diaphaneity:

Transparent to Translucent

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Pseudo Tetragonal - Crystals show a tetragonal shape.

Hardness:

7 - Quartz

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Chambersite

Gladstone-Dale:

CI meas= 0.031 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.028 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.212,KPDmeas= 0.2114,KC= 0.218
Ncalc = 1.76

Optical Data:

Biaxial (+), a=1.732, b=1.737, g=1.744, bire=0.0120, 2V(Calc)=82, 2V(Meas)=83.

Calculated Properties of Chambersite

Electron Density:

Bulk Density (Electron Density)=3.32 gm/cc
note: Specific Gravity of Chambersite =3.48 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Chambersite= 9.46 barns/electron
U=PE_Chambersite x rElectron Density= 31.42 barns/cc.

Radioactivity:

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

Chambersite Classification

Dana Class:

25.06.01.03 (25)Anhydrous Borates Containing Hydroxyl or Halogen

(25.06)Dana Type

(25.06.01)Boracite Group (Orthorhombic: Rca21)

25.06.01.01 Boracite Mg3B7O13Cl P ca2₁ mm2

25.06.01.02 Ericaite (Fe,Mg,Mn)3B7O13Cl P ca2₁ mm2

25.06.01.03 Chambersite Mn3B7O13Cl P ca2₁ mm2

Strunz Class:

06.GA.05 06 - BORATES

06.G - Heptaborates and other Megaborates

06.GA -Tekto-heptaborates

06.GA.05 Boracite Mg3B7O13Cl P ca2₁ mm2

06.GA.05 Chambersite Mn3B7O13Cl P ca2₁ mm2

06.GA.05 Ericaite (Fe,Mg,Mn)3B7O13Cl P ca2₁ mm2

Other Chambersite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Chambersite :
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

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Ask about Chambersite here :
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Print or Cut-and-Paste your Chambersite Specimen Label here :

Chambersite

Mn3B7O13Cl
Dana No: 25.06.01.03 Strunz No: 06.GA.05
Locality:

Notes: