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Barringtonite

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Formula:
MgCO3 · 2H2O
Crystal System:
Triclinic
Name:
Named for Barrington Tops, type locality.
Originally reported from Rainbow Falls, Semphill Creek, Barrington Tops, Gloucester Co., New South Wales, Australia.


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Classification of BarringtoniteHide

Notes:
Unnamed (probably valid)
Approval History:
Unnamed, but probably valid.
5.CA.15

5 : CARBONATES (NITRATES)
C : Carbonates without additional anions, with H2O
A : With medium-sized cations
15.1.5.1

15 : HYDRATED NORMAL CARBONATES
1 : A(XO3)·xH2O
11.3.2

11 : Carbonates
3 : Carbonates of Mg

Optical Data of BarringtoniteHide

Type:
Biaxial (+)
RI values:
nα = 1.458 nβ = 1.473 nγ = 1.501
2V:
Measured: 73° , Calculated: 74°
Max Birefringence:
δ = 0.043
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
none

Chemical Properties of BarringtoniteHide

Formula:
MgCO3 · 2H2O

Crystallography of BarringtoniteHide

Crystal System:
Triclinic
Cell Parameters:
a = 9.15 Å, b = 6.2 Å, c = 6.09 Å
α = 94°, β = 95.5°, γ = 108.7°
Ratio:
a:b:c = 1.476 : 1 : 0.982
Unit Cell V:
323.89 ų (Calculated from Unit Cell)

Other Language Names for BarringtoniteHide

Simplified Chinese:二菱镁矿

Related Minerals - Nickel-Strunz GroupingHide

5.CA.05NesquehoniteMgCO3 · 3H2OMon. 2/m : P21/m
5.CA.10LansforditeMgCO3 · 5H2OMon. 2/m : P21/b
5.CA.20HellyeriteNiCO3 · 5.5H2OMon. 2/m : P2/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

11.3.1MagnesiteMgCO3Trig. 3m (3 2/m) : R3c
11.3.3NesquehoniteMgCO3 · 3H2OMon. 2/m : P21/m
11.3.4LansforditeMgCO3 · 5H2OMon. 2/m : P21/b
11.3.5PokrovskiteMg2(CO3)(OH)2Mon.
11.3.6ArtiniteMg2(CO3)(OH)2 · 3H2OMon.
11.3.7HydromagnesiteMg5(CO3)4(OH)2 · 4H2OMon.
11.3.8GiorgiositeMg5(CO3)4(OH)2 · 5-6H2O
11.3.9DypingiteMg5(CO3)4(OH)2 · 5H2OMon.
11.3.10EiteliteNa2Mg(CO3)2Trig.
11.3.11Mcguinnessite(Mg,Cu)2(CO3)(OH)2

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 BarringtoniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist: 50: 2103.
Mineralogical Magazine: 34: 370-372.

Internet Links for BarringtoniteHide

Localities for BarringtoniteHide

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.
Australia
 
  • New South Wales
    • Gloucester Co.
      • Barrington Tops
        • Sempill Creek
Mineralogical Magazine 1965 34 : 370-372
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium; Lavreotiki Municipality)
      • Lavrion District Mines
        • Sounion area
          • Sounion Mines
Kolitsch, U., Rieck, B., Brandstätter, F., Schreiber, F., Fabritz, K. H., Blaß, G. & Gröbner, J. (2014): Neufunde aus dem altem Bergbau und den Schlacken von Lavrion (I). Mineralien-Welt 25 (1), 60-75 (in German).
Mineral and/or Locality  
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