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Chambersite

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Formula:
Mn32+(B7O13)Cl
System:
Orthorhombic
Colour:
Colorless to deep purple
Hardness:
7
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.

Classification of Chambersite

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
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Type Occurrence of Chambersite

Year of Discovery:
1962
Geological Setting of Type Material:
Saltdome caprock.
Associated Minerals at Type Locality:

Physical Properties of Chambersite

Vitreous
Diaphaneity (Transparency):
Transparent, Opaque
Colour:
Colorless to deep purple
Comment:
Darkens with exposure to sunlight
Hardness (Mohs):
7
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
3.49(2) g/cm3 (Measured)    3.48 g/cm3 (Calculated)

Crystallography of Chambersite

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 Volume:
V 923.70 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Pseudotetrahedral
Twinning:
Rare interpenetrant on [111] with twim plane of {111}

Optical Data of Chambersite

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 Chambersite

Formula:
Mn32+(B7O13)Cl
Essential elements:
All elements listed in formula:

Relationship of Chambersite to other Species

Member of:
Other Members of Group:
BoraciteMg3(B7O13)Cl
Congolite(Fe2+,Mg)3(B7O13)Cl
EricaiteFe32+(B7O13)Cl
Trembathite(Mg,Fe)3(B7O13)Cl
6.GA.05BoraciteMg3(B7O13)Cl
6.GA.05EricaiteFe32+(B7O13)Cl
6.GA.10Congolite(Fe2+,Mg)3(B7O13)Cl
6.GA.10Trembathite(Mg,Fe)3(B7O13)Cl
6.GA.30KorzhinskiteCa(B2O4) · H2O
10.1.1TeepleiteNa2[B(OH)4]Cl
10.1.2BandyliteCu[B(OH)4]Cl
10.1.3BerboriteBe2(BO3)(OH,F) · H2O
10.1.4FluoboriteMg3(BO3)(F,OH)3
10.1.5BoraciteMg3(B7O13)Cl
10.1.6KarliteMg7(BO3)3(OH,Cl)5
10.1.7ShabyniteMg5(BO3)(OH)5(Cl,OH)2 · 4H2O
10.1.8/9/10HilgarditeCa2B5O9Cl · H2O
10.1.11SolongoiteCa2(H3B3O7)(OH)Cl
10.1.12HydrochlorboriteCa4B8O15Cl2 · 21H2O
10.1.13EkateriniteCa2(B4O7)(Cl,OH)2 · 2H2O
10.1.14VolkovskiteKCa4[B5O8OH]4[B(OH)3]2Cl · 4H2O
10.1.15ChelkariteCaMgB2O4(Cl,OH)2 · 5H2O Or near, with Cl:OH = 3:1
10.1.16JohachidoliteCaAlB3O7
10.1.17SatimoliteKNa2Al4[Cl|B2O5]3 · 13H2O
10.1.19Congolite(Fe2+,Mg)3(B7O13)Cl
10.1.20EricaiteFe32+(B7O13)Cl

Other Names for Chambersite

Name in Other Languages:
German:Chambersit
Simplified Chinese:锰方硼石
Spanish:Chambersita

Other Information

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 Chambersite

Reference List:
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 Chambersite

Localities for Chambersite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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
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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