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About MalladriteHide

Pale rose.
Specific Gravity:
Crystal System:
After Alessandro Malladra (born in Turin, 1865; died in Rome, 1945), professor at the College Mellerio Rosmini-Domodossola; director (1927–1935) of the Vesuvius Observatory.
This page provides mineralogical data about Malladrite.

Classification of MalladriteHide

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 MalladriteHide

Pale rose.
2.714 g/cm3 (Measured)    

Optical Data of MalladriteHide

Uniaxial (-)
RI values:
nω = 1.313 nε = 1.309
Max Birefringence:
δ = 0.004
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of MalladriteHide

IMA Formula:

Crystallography of MalladriteHide

Crystal System:
Cell Parameters:
a = 8.86 Å, c = 5.04 Å
a:c = 1 : 0.569
Unit Cell V:
342.63 ų (Calculated from Unit Cell)
Crystals prismatic [0001] with basal plane and pyramid.

Type Occurrence of MalladriteHide

Geological Setting of Type Material:
Lava deposits on an active volcano.
Associated Minerals at Type Locality:

Other Language Names for MalladriteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Avogadrite2 photos of Malladrite associated with Avogadrite on mindat.org.

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.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[SiF6]Trig. 3m (3 2/m)[SiF6]Hex. 6mm : P63mc

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

8.12.2Avogadrite(K,Cs)[BF4]Orth. mmm (2/m 2/m 2/m) : Pnma
8.12.4HieratiteK2[SiF6]Iso. m3m (4/m 3 2/m) : Fm3m
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

Slightly soluble in cold water; slightly 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.

References for MalladriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Stolba (1872) Zeitschrift für anorganische und allgemeine Chemie, Hamburg, Leipzig: 11: 199.
Bertrand (1880) Bulletin de la Société française de Minéralogie: 3: 57.
Raiteri (1922) Reale accademia nazionale dei Lincei, Rendus, Rome: 31: 115.
Zambonini and Carobbi (1926) Reale accademia nazionale dei Lincei, Rendus, Rome: 4: 173.
American Mineralogist (1927): 12: 379.
Collins (1929) Chemical News and Journal of Industrial Science, London: 318: 184.
Carobbi (1933) Periodico de Mineralogia-Roma: 4: 410.
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: 105-106.
Acta Crystallographica (1964): 17: 1408-1412.

Internet Links for MalladriteHide

Localities for MalladriteHide

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.
  • 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.
Italy (TL)
  • Campania
    • Naples
      • Somma-Vesuvius Complex
Accad.Lincei.Rend.Cl.Sci.fis.mat.nat., Roma (1926) ser.6, 4, 171-175; 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, 106; Lapis (1994): 5: 13-23, 58.
Russo, M., Punzo, I. (2004): I minerali del Somma-Vesuvio, AMI
  • Sicily
    • Messina Province
      • Eolie Islands (Aeolian Islands)
        • Lipari
          • Vulcano Island
GARAVELLI A., LAVIANO R., VURRO F. (1997): Sublimate deposition from hydrothermal fluids at the Fossa Crater - Vulcano, Italy. - European Journal of Mineralogy - 9, 2, 423-432. [Found in sample tubes only]
  • 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
  • Kamchatka Krai
American Mineralogist, Volume 82, pages 1038–1041, 1997
Mineral and/or Locality  
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