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Bararite

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Big Photo

Burnside, Northumberland Co., Pennsylvania, USA
© 2007, JGW




Formula:
(NH
 
4
)
 
2
[SiF
 
6
]
System:TrigonalColour:White; colourless in ...
Lustre:VitreousHardness:2½
Name:For the locality at the Bararee colliery, Barari, Jharia coal field, India.
Dimorph of:Cryptohalite
This page provides mineralogical data about Bararite.

Classification of Bararite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:3/B.02-40
Nickel-Strunz 10th (pending) edition ID:3.CH.10

3 : HALIDES
C : Complex halides
H : Silicofluorides
Dana 8th edition ID:11.5.2.2

11 : HALIDE COMPLEXES
5 : AmBX6
Hey's CIM Ref.:8.12.6

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
12 : Fluorborates (BF'4) and fluosilicates (SiF''6)
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Type Occurrence of Bararite

Type Locality:Barari Colliery, Jharia Coalfield, Bihar, India
Year of Discovery:1951
Geological Setting of type material:Above a burning coal seam
Associated Minerals at type locality:
SulphurSalammoniacCryptohalite

Occurrences of Bararite

Geological Setting:Above burning coal seams; sublimation product at fumaroles and in burning anthracite piles.

Physical Properties of Bararite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:White; colourless in thin section
Hardness (Mohs):2½
Cleavage:Perfect
on {0001}
Density (measured):2.152 g/cm3
Density (calculated):2.144 g/cm3

Crystallography of Bararite

Crystal System:Trigonal
Class (H-M):3m (3 2/m) - Hexagonal Scalenohedral
Cell Parameters:a = 5.77Å, c = 4.78Å
Ratio:a:c = 1 : 0.828
Unit Cell Volume:V 137.82 ų (Calculated from Unit Cell)
Z:1
Morphology:Minute crystals, flattened on {0001}, may be elongated perpendicular to [0001]; also arborescent and mammillary. Commonly included within cryptohalite.
Twinning:Dartlike or paddlewheel twins, with twin plane inclined to {0001}
X-Ray Powder Diffraction:
d-spacingIntensity
4.84 (100)
2.42 (45)
2.09 (40)
2.22 (35)
3.45 (30)
5.00 (20)
4.20 (20)
Comments:Recorded on material from Kehley's Run Mine, Pennsylvania, USA

Optical Data of Bararite

Type:Uniaxial (-)
RI values: nω = 1.406 nε = 1.391
Maximum Birefringence:δ = 0.015

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate

Chemical Properties of Bararite

Formula:
(NH
 
4
)
 
2
[SiF
 
6
]
Essential elements:F, H, N, Si
All elements listed in formula:F, H, N, Si
Analytical Data:Analyses of natural material have not been made.
Relationship of Bararite to other Species
Related Minerals - Nickel-Strunz Grouping):

- + 
3.CH.05Malladrite
Na
 
2
[SiF
 
6
]
3.CH.15Cryptohalite
(NH
 
4
)
 
2
[SiF
 
6
]
3.CH.15Hieratite
K
 
2
[SiF
 
6
]
3.CH.20Demartinite
K
 
2
[SiF
 
6
]
3.CH.25Knasibfite
K
 
3
Na
 
4
[SiF
 
6
]
 
3
[BF
 
4
]
Related Minerals - Hey's Index Grouping:

- + 
8.12.1Ferruccite
Na[BF
 
4
]
8.12.2Avogadrite
(K,Cs)[BF
 
4
]
8.12.3Malladrite
Na
 
2
[SiF
 
6
]
8.12.4Hieratite
K
 
2
[SiF
 
6
]
8.12.5Cryptohalite
(NH
 
4
)
 
2
[SiF
 
6
]
Other Names for Bararite
Other Languages:
German:Bararit
Russian:Барарит
Spanish:Bararita
Other Information
Other Information:Easily soluble in water.
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 Bararite
Reference List:

- + 
Scacchi (1873) Reale accademia delle scienze fisische e matematiche, Naples, Att.: 6, no. 9.



Gossner (1903) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 38: 147.



Christie (1926) Records of the Geological Survey of India, Calcutta: 59: 233. 



Gossner and Kraus (1934) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 88: 223.



Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 106-107.



American Mineralogist (1952) 37, 361.



Journal of Chemical Physics 45, 408-409.



Lapham, D. M., Barnes, J. H., Downey, W. F., Jr. and Finkelman, R. B. (1980): Mineralogy associated with burning anthracite deposits of eastern Pennsylvania. Pennsylvania Geol. Surv. Min. Res. Report, 4th ser., 78, 45-47.



Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 37.
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    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the  symbol to view information about a locality. 
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    (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.

    Czech Republic
     
    

    • Bohemia (Böhmen; Boehmen)
    

      • Hradec Králové Region
    

        • Trutnov (Trautenau)
    

          • Radvanice
    
    		Žáček, V., Ondruš, P.: Mineralogy of recently formed sublimates from Kateřina colliery in Radvanice, Eastern Bohemia, Czech Republic. Bulletin of the Czech geological survey, 1998, vol. 73, no. 2, s. 289-302.
    Germany
     
    

    • Baden-Württemberg
    

      • Black Forest
    

        • Wolfach
    

          • Oberwolfach
    

            • Rankach valley
    
    		Walenta, K. (1992): Die Mineralien des Schwarzwaldes. Chr. Weise Verlag, München, 336 pp. (in German)
    India
     
    

    • Bihar
    

      • Jharia Coalfield
    
    		Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 107; American Mineralogist (1952): 37: 361.
    Italy
     
    

    • Campania
    

      • Naples Province
    

        • Somma-Vesuvius Complex
    
    		Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 105; Lapis (1994): 5: 13-23, 58.
    

    • Sardinia
    

      • Nuoro Province
    

        • Macomer
    
    		AA. VV., 1996. Collezionare minerali. Hobby & Work. 
    

    • Sicily
    

      • Messina Province
    

        • Lipari
    

          • Eolie Islands (Aeolian Islands)
    
    		AA. VV., 1996. Collezionare minerali. Hobby & Work. 
    





MONTRASIO A., SCIESA E., VIGNOLA P. (1996) – Collezionare minerali – Hobby & Work, Ed., Milano, 800 pp.
    USA
     
    

    • Pennsylvania
    

      • Northumberland Co.
    

    


      • Schuylkill Co.
    

        • Shenandoah
    
    		Reed, Juliet C. (1976), Annotated Biblio. of Minerals New to the Pennsylvania List 1965-1974, The Mineralogical Society of PA, Inc.: 18-19; Montgomery, A. (Sep 1972) PA Minerals (PM) (117), Keystone Newsletter; Grant, R.W. (Feb & Mar 73), PM (122 & 123);
    

    


    

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