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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

ⓘ - 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.
Democratic Republic of the Congo
  • Nord-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
  • Southern Region
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 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: 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.
Réunion Island
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.
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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