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Chambersite

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Formula:
Mn2+3(B7O13)Cl
Colour:
Colorless to deep purple
Lustre:
Vitreous
Hardness:
7
Specific Gravity:
3.49
Crystal System:
Orthorhombic
Member of:
Name:
From Chambers County, Texas, USA, where it was first discovered.
Boracite Group. The manganese analogue of Boracite and Ericaite.

Visit gemdat.org for gemological information about Chambersite.


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Classification of ChambersiteHide

Approved
6.GA.05

6 : BORATES
G : Heptaborates and other megaborates
A : Tekto-heptaborates
25.6.1.3

25 : ANHYDROUS BORATES CONTAINING HYDROXYL OR HALOGEN
6 : Hexaborates
10.1.18

10 : Borates with other anions
1 : Borates with halide

Pronounciation of ChambersiteHide

Pronounciation:
PlayRecorded byFrom
Jolyon & Katya RalphUnited Kingdom

Physical Properties of ChambersiteHide

Vitreous
Transparency:
Transparent, Opaque
Colour:
Colorless to deep purple
Comment:
Darkens with exposure to sunlight
Hardness:
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
3.49(2) g/cm3 (Measured)    3.48 g/cm3 (Calculated)

Optical Data of ChambersiteHide

Type:
Biaxial (+)
RI values:
nα = 1.732 nβ = 1.737 nγ = 1.744
2V:
Measured: 83° , Calculated: 82°
Max Birefringence:
δ = 0.012
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v

Chemical Properties of ChambersiteHide

Formula:
Mn2+3(B7O13)Cl
IMA Formula:
Mn3B7O13Cl

Crystallography of ChambersiteHide

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Pca21
Cell Parameters:
a = 8.68(1) Å, b = 8.68(1) Å, c = 12.26(1) Å
Ratio:
a:b:c = 1 : 1 : 1.412
Unit Cell V:
923.70 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Pseudotetrahedral
Twinning:
Rare interpenetrant on [111] with twim plane of {111}

Type Occurrence of ChambersiteHide

Geological Setting of Type Material:
Saltdome caprock.
Associated Minerals at Type Locality:

Other Language Names for ChambersiteHide

German:Chambersit
Simplified Chinese:锰方硼石
Spanish:Chambersita

Relationship of Chambersite to other SpeciesHide

Member of:
Other Members of this group:
BoraciteMg3(B7O13)ClOrth. mm2 : Pca21
Congolite(Fe2+,Mg)3(B7O13)ClTrig. 3m : R3c
EricaiteFe2+3(B7O13)ClOrth.
Trembathite(Mg,Fe)3(B7O13)ClTrig.

Related Minerals - Nickel-Strunz GroupingHide

6.GA.05BoraciteMg3(B7O13)ClOrth. mm2 : Pca21
6.GA.05EricaiteFe2+3(B7O13)ClOrth.
6.GA.10Congolite(Fe2+,Mg)3(B7O13)ClTrig. 3m : R3c
6.GA.10Trembathite(Mg,Fe)3(B7O13)ClTrig.
6.GA.30KorzhinskiteCa(B2O4) · H2O

Related Minerals - Dana Grouping (8th Ed.)Hide

25.6.1.1BoraciteMg3(B7O13)ClOrth. mm2 : Pca21
25.6.1.2EricaiteFe2+3(B7O13)ClOrth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

10.1.1TeepleiteNa2[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
10.1.2BandyliteCu[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
10.1.3BerboriteBe2(BO3)(OH,F) · H2OTrig.
10.1.4FluoboriteMg3(BO3)(F,OH)3Hex.
10.1.5BoraciteMg3(B7O13)ClOrth. mm2 : Pca21
10.1.6KarliteMg7(BO3)3(OH,Cl)5Orth.
10.1.7ShabyniteMg5(BO3)(OH)5(Cl,OH)2 · 4H2OMon.
10.1.8/9/10HilgarditeCa2B5O9Cl · H2OTric. 1 : P1
10.1.11SolongoiteCa2(H3B3O7)(OH)ClMon.
10.1.12HydrochlorboriteCa4B8O15Cl2 · 21H2OMon.
10.1.13EkateriniteCa2(B4O7)(Cl,OH)2 · 2H2OHex.
10.1.14VolkovskiteKCa4[B5O8OH]4[B(OH)3]2Cl · 4H2OTric. 1 : P1
10.1.15ChelkariteCaMgB2O4(Cl,OH)2 · 5H2O Or near, with Cl:OH = 3:1Orth.
10.1.16JohachidoliteCaAlB3O7Orth. mmm (2/m 2/m 2/m) : Cmma
10.1.17SatimoliteKNa2Al4[Cl|B2O5]3 · 13H2OOrth.
10.1.19Congolite(Fe2+,Mg)3(B7O13)ClTrig. 3m : R3c
10.1.20EricaiteFe2+3(B7O13)ClOrth.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for ChambersiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1962): 47: 665-671.
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for ChambersiteHide

Localities for ChambersiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Canada
 
  • New Brunswick
    • Kings Co.
      • Cardwell Parish
CM 43, 1469-1487
Grice, J. L. (2002): Borate Minerals from the Penobsquis and Millstream Deposits of Southern New Brunswick, Canada. Bergverksmuseets Skrift 20, 27-33
  • Nova Scotia
    • Cumberland Co.
      • Pugwash
Ronnie Van Dommelen
China
 
  • Beijing Municipality
    • Pinggu District
http://wrgis.wr.usgs.gov/open-file/of03-220/DATABASE/lode_deposits.txt
  • Hebei Province
    • Chengde Prefecture
      • Xinglong Co.
Xiong Song (1989): Geology and Prospecting 25(5), 3-10
    • Zhangjiakou Prefecture
      • Zhuolu Co.
Xiong Song (1989): Geology and Prospecting 25(5), 3-10
  • Tianjin Municipality
    • Ji Co.
Xiong Song (1989): Geology and Prospecting 25(5), 3-10; Shikun Huang (1990): Geology and Prospecting 26(9), 6-11, 20; Fan, D., Yang, P., and Wang, R. (1999): Ore Geology Reviews 15(1), 15-29
USA
 
  • Louisiana
    • Ascension Parish
      • Darrow
R&M 69:3 pp 156-162
    • Plaquemines Parish
R&M 69:3 pp 156-162
R&M 69:3 pp 156-162
  • Texas
    • Chambers Co.
      • Mont Belvieu
American Mineralogist (1962): 47: 665-671.
Mineral and/or Locality  
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