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About HieratiteHide

Colourless, white, grey; Colourless in transmitted light.
Specific Gravity:
Crystal System:
Named by Alfonso Cossa in 1881 after the type locality of Volcano, Italy. The name Vulcano, in ancient Greek, is Hiera.
Dimorph of:
Isostructural with:
This page provides mineralogical data about Hieratite.

Classification of HieratiteHide

Approved, 'Grandfathered' (first described prior to 1959)

C : Complex halides
H : Silicofluorides

5 : AmBX6

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

Physical Properties of HieratiteHide

Colourless, white, grey; Colourless in transmitted light.
2½ on Mohs scale
on {111}
2.665 g/cm3 (Measured)    2.668 g/cm3 (Calculated)

Optical Data of HieratiteHide


Chemical Properties of HieratiteHide

IMA Formula:

Crystallography of HieratiteHide

Crystal System:
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Cell Parameters:
a = 8.13 Å
Unit Cell V:
537.37 ų (Calculated from Unit Cell)
Crystals cubo-octahedral and octahedral. Stalactitic concretions, spongy to dense.

Type Occurrence of HieratiteHide

Other Language Names for HieratiteHide


Common AssociatesHide

Associated Minerals Based on Photo Data:
Demartinite1 photo of Hieratite associated with Demartinite on

Related Minerals - Nickel-Strunz GroupingHide

3.CH.10Bararite(NH4)2[SiF6]Trig. 3m (3 2/m)
3.CH.15Cryptohalite(NH4)2[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[SiF6]Iso. m3m (4/m 3 2/m) : Fm3m m3m (4/m 3 2/m) : Fm3m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

8.12.2Avogadrite(K,Cs)[BF4]Orth. mmm (2/m 2/m 2/m) : Pnma
8.12.5Cryptohalite(NH4)2[SiF6]Iso. m3m (4/m 3 2/m) : Fm3m
8.12.6Bararite(NH4)2[SiF6]Trig. 3m (3 2/m)

Other InformationHide

Soluble in cold water; more so in hot 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.
Industrial Uses:

References for HieratiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Stolba (1865) Journal für praktische Chemie, Leipzig: 96: 26
Stolba (1867) Journal für praktische Chemie, Leipzig: 102: 1.
Cossa, A. (1881-1882) Sulla hieratite, nuova specie mineralogica. Transunti dell'Accademia dei Lincei, Serie 3: 6: 141-142. (in Italian)
Cossa, A. (1882) Sur la hiératite, espèce minérale nouvelle. Bulletin de la Société Minéralogique de France: 5: 61-62. (in French)
Bozarth (1922) Journal of the American Chemical Society: 44: 1066.
Christie (1926) Geological Survey of India, Calcutta, Records: 59: 233.
Zambonini, F., Carobbi, G. (1926) Sulla presenza del fluosilicato sodico e di quello di potassio tra i prodotti dell’attuale attività del Vesuvio. Rendiconti della Accademia Nazionale dei Lincei, Serie VI: 4: 171-175. (in Italian)
Gossner, Kraus (1934) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 88: 223.
Ketelaar, J.A.A. (1935) Die Kristallstruktur von K-, Rb-, Cs-, und Tl- silico-fluoride und von LiMnO4•3H2O. Zeitschrift für Kristallographie: 92: 155-156.
Carobbi, G. (1936) Fluoruro di alluminio, magnesio e calcio, bisolfato sodico, mercallite ed hieratite fra i prodotti dell'attivita fumarolica vesuviana del 1934. Atti della Regia Accademia di Scienze, Lettere ed Arti di Modena, Serie V: 1: 33-48. (in Italian)
Carobbi, G. (1940) Ricerche vesuviane. Bulletin Volcanologique, Série 2: 7: 42 pages.
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: 103-104.
Denaeyer, M.E., Ledent, D. (1952) Sur la présence de la modification hexagonale de la hieratite (camermanite) dans des incrustations de sels potassiques d'une cheminée d'usine. Bulletin de la Société Française de Minéralogie et de Cristallographie: 75: 231-236. (in French)
Sclar, C.B., Fahey, J.J. (1972) The staining mechanism of potassium feldspar and the origin of hieratite. American Mineralogist: 57: 287-291.
Boer, R.H., Beuker, G.J, Meyer, F.M., Smith, C.B. (1993) Fluoride precipitates in silicate wet-chemistry: implications on REE fractionation. Chemical Geology: 104: 93-98.
Göbel, O.F., ten Elshof, J.E., Kaminsky, W., Hannss, M. (2015) Optical anomaly in artificial cubic hieratite, K2[SiF6]. Acta Crystallographica B: 71: 328-333.

Internet Links for HieratiteHide

Localities for HieratiteHide

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.
  • Eastern Antarctica
    • Victoria Land
      • Ross Island
Kammerer, M. M. (2011). Nature and origin of salt deposits around the crater of Erebus volcano, Antarctica (Master dissertation, New Mexico Institute of Mining and Technology).
DR Congo
  • North Kivu
    • Goma
Bailey, J. C: Formation of cryolite and other aluminofluorides: A petrologic review. Bull. geol. Soc. Denmark, vol. 29, pp. 1-45. Copenhagen, June 10th, 1980
  • Réunion
Vlastélic, I., Staudacher, T., Deniel, C., Devidal, J. L., Devouard, B., Finizola, A., & Telouk, P. (2013). Lead isotopes behavior in the fumarolic environment of the Piton de la Fournaise volcano (Reunion Island). Geochimica et Cosmochimica Acta, 100, 297-314.
  • Southern Region
    • Rangárþing ytra
Garavelli, A., Balić-Žunić, T., Mitolo, D., Acquafredda, P., Leonardsen, E., Jakobson, S.P. (2010): Heklaite, KNaSiF6, a new fumarolic mineral from Hekla volcano, Iceland. Mineralogical Magazine, 74, 147-157.
  • 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: 99, 104.
  • Sicily
    • Messina Province
      • Eolie Islands (Aeolian Islands)
        • Lipari
          • Vulcano Island
COSSA, A. (1881-1882): Sulla hieratite, nuova specie mineralogica. Transunti dell'Accademia dei Lincei - Serie 3, 6, 141-142.
Saint Helena
Bailey, J. C: Formation of cryolite and other aluminofluorides: A petrologic review. Bull. geol. Soc. Denmark, vol. 29, pp. 1-45. Copenhagen, June 10th, 1980
  • Pennsylvania
    • Schuylkill Co.
      • Shenandoah
M.E. Ciriotti, 2006, probed
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