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Bararite

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About BarariteHide

Formula:
(NH4)2[SiF6]
Colour:
White; colourless in thin section
Lustre:
Vitreous
Hardness:
Specific Gravity:
2.152
Crystal System:
Trigonal
Name:
For the locality at the Bararee colliery, Barari, Jharia coal field, India.
Dimorph of:
This page provides mineralogical data about Bararite.


Classification of BarariteHide

Approved, 'Grandfathered' (first described prior to 1959)
3.CH.10

3 : HALIDES
C : Complex halides
H : Silicofluorides
11.5.2.2

11 : HALIDE COMPLEXES
5 : AmBX6
8.12.6

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

Physical Properties of BarariteHide

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

Optical Data of BarariteHide

Type:
Uniaxial (-)
RI values:
nω = 1.406 nε = 1.391
Max Birefringence:
δ = 0.015
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of BarariteHide

Formula:
(NH4)2[SiF6]
IMA Formula:
(NH4)2SiF6

Crystallography of BarariteHide

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Cell Parameters:
a = 5.77 Å, c = 4.78 Å
Ratio:
a:c = 1 : 0.828
Unit Cell 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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.84 Å(100)
2.42 Å(45)
2.09 Å(40)
2.22 Å(35)
3.45 Å(30)
5.00 Å(20)
4.20 Å(20)
Comments:
Recorded on material from Kehley's Run Mine, Pennsylvania, USA

Geological EnvironmentHide

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

Type Occurrence of BarariteHide

Geological Setting of Type Material:
Above a burning coal seam
Associated Minerals at Type Locality:

Other Language Names for BarariteHide

German:Bararit
Spanish:Bararita

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Bararite associated with SulphurS8

Related Minerals - Nickel-Strunz GroupingHide

3.CH.05MalladriteNa2[SiF6]Trig.
3.CH.15Cryptohalite(NH4)2[SiF6]Iso. m3m (4/m 3 2/m) : Fm3m
3.CH.15HieratiteK2[SiF6]Iso. m3m (4/m 3 2/m) : Fm3m
3.CH.20DemartiniteK2[SiF6]Hex. 6mm : P63mc
3.CH.25KnasibfiteK3Na4[SiF6]3[BF4]Orth. mm2 : Imm2

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

11.5.2.1MalladriteNa2[SiF6]Trig.
11.5.2.3DemartiniteK2[SiF6]Hex. 6mm : P63mc

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

8.12.1FerrucciteNa[BF4]Orth.
8.12.2Avogadrite(K,Cs)[BF4]Orth. mmm (2/m 2/m 2/m) : Pnma
8.12.3MalladriteNa2[SiF6]Trig.
8.12.4HieratiteK2[SiF6]Iso. m3m (4/m 3 2/m) : Fm3m
8.12.5Cryptohalite(NH4)2[SiF6]Iso. m3m (4/m 3 2/m) : Fm3m

Other InformationHide

Notes:
Easily soluble in water.
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 BarariteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.

Internet Links for BarariteHide

Localities for BarariteHide

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.
Czech Republic
 
  • Hradec Králové Region
    • Trutnov District
      • 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
    • Freiburg
      • Ortenaukreis
        • Oberwolfach
Walenta, K. (1992): Die Mineralien des Schwarzwaldes. Chr. Weise Verlag, München, 336 pp. (in German)
India (TL)
 
  • Jharkhand
    • Dhanbad District
      • 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
      • 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
      • Eolie Islands (Aeolian Islands)
        • Lipari
AA. VV., 1996. Collezionare minerali. Hobby & Work.
MONTRASIO A., SCIESA E., VIGNOLA P. (1996) – Collezionare minerali – Hobby & Work, Ed., Milano, 800 pp.
Poland
 
  • Silesian Voivodeship
    • Wodzisław Co.
      • Radlin
Łukasz Kruszewski (2012) Unique chloride assemblage of exhalative origin from burning coal-mining dump in Radlin (Rybnik Coal Area, S Poland). Mineralogical Society of Poland Special Papers 40
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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