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Barringtonite

Formula:
MgCO
 
3
·2H
 
2
O
System:Triclinic
Name:Named for Barrington Tops, type locality.


Originally reported from Rainbow Falls, Semphill Creek, Barrington Tops, Gloucester Co., New South Wales, Australia.

Classification of Barringtonite

IMA status:Published without Approval 1965
Strunz 8th edition ID:5/D.01-10
Nickel-Strunz 10th (pending) edition ID:5.CA.15

5 : CARBONATES (NITRATES)
C : Carbonates without additional anions, with H2O
A : With medium-sized cations
Dana 8th edition ID:15.1.5.1

15 : HYDRATED NORMAL CARBONATES
1 : A(XO3)·xH2O
Hey's CIM Ref.:11.3.2

11 : Carbonates
3 : Carbonates of Mg
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Crystallography of Barringtonite

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

Optical Data of Barringtonite

Type:Biaxial (+)
RI values: nα = 1.458 nβ = 1.473 nγ = 1.501
2V:Measured: 73° , Calculated: 74°
Maximum Birefringence:δ = 0.043

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:none

Chemical Properties of Barringtonite

Formula:
MgCO
 
3
·2H
 
2
O
Essential elements:C, H, Mg, O
All elements listed in formula:C, H, Mg, O

Relationship of Barringtonite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
5.CA.05Nesquehonite
MgCO
 
3
·3H
 
2
O
5.CA.10Lansfordite
MgCO
 
3
·5H
 
2
O
5.CA.20Hellyerite
NiCO
 
3
·6H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
11.3.1Magnesite
MgCO
 
3
11.3.3Nesquehonite
MgCO
 
3
·3H
 
2
O
11.3.4Lansfordite
MgCO
 
3
·5H
 
2
O
11.3.5Pokrovskite
Mg
 
2
[(OH)
 
2
|CO
 
3
]
11.3.6Artinite
Mg
 
2
[(OH)
 
2
|CO
 
3
] · 3H
 
2
O
11.3.7Hydromagnesite
Mg
 
5
[(CO
 
3
)
 
4
(OH)
 
2
] · 4H
 
2
O
11.3.8Giorgiosite
Mg
 
5
[(CO
 
3
)
 
4
(OH)
 
2
] · 4H
 
2
O
11.3.9Dypingite
Mg
 
5
[OH|(CO
 
3
)
 
2
]
 
2
 · 5H
 
2
O
11.3.10Eitelite
Na
 
2
Mg(CO
 
3
)
 
2
11.3.11Mcguinnessite
(Mg,Cu)
 
2
[(OH)
 
2
|CO
 
3
]

Other Names for Barringtonite

Other Languages:
German:Barringtonit
Spanish:Barringtonita

Other Information

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

References for Barringtonite

Reference List:American Mineralogist: 50: 2103.

Mineralogical Magazine: 34: 370-372.

Internet Links for Barringtonite

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    Localities for Barringtonite

    Hide Locality List
    The 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. ? 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.
    Australia
     
    • New South Wales
      • Gloucester Co.
        • Barrington Tops
          • Semphill Creek
    		Mineralogical Magazine 1965 34 : 370-372
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 7th Nov 2009 11:47:52