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Yellow, brown-red, ...
From the Greek μόλυσις, a stain, in allusion to its staining the lavas of the volcanoes where it was found.
This page provides mineralogical data about Molysite.

Classification of Molysite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"

A : Simple halides, without H2O
C : M:X = 1:3

3 : AX3

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
11 : Halides of Fe and Ni URL:
Please feel free to link to this page.

Type Occurrence of Molysite

General Appearance of Type Material:
Coatings on lava.
Year of Discovery:
Geological Setting of Type Material:
Active volcanic fumaroles.

Physical Properties of Molysite

Yellow, brown-red, purple-red
On {0001}.
2.9 g/cm3 (Measured)    3.04 g/cm3 (Calculated)

Crystallography of Molysite

Crystal System:
Cell Parameters:
a = 6.69Å
Unit Cell Volume:
V 0.00 ų (Calculated from Unit Cell)
Crystals tabular {0001} with a hexagonal outline (artificial material). Massive, coatings.

Optical Data of Molysite

Uniaxial (-)

Chemical Properties of Molysite

All elements listed in formula:

Relationship of Molysite to other Species

8.11.2HydromolysiteFeCl3 · 6H2O
8.11.3RokühniteFeCl2 · 2H2O
8.11.8IowaiteMg6Fe23+(OH)16Cl2 · 4H2O
8.11.9NickelbischofiteNiCl2 · 6H2O

Other Names for Molysite

Name in Other Languages:

Other Information

Thermal Behaviour:
Melting point = 282°.
Other Information:
Very deliquescent. Readily hydrolyzed by water to hydrous iron oxide.
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 Molysite

Reference List:
Hausmann (1819) (as Eisenchlorid).

Hausmann, J.F.L. (1847) Handbuch der Mineralogie 3 volumes, Göttingen. Second edition: vol. 2, in two parts: 1463.

Dana, J.D. (1868) System of Mineralogy, 5th. Edition, New York: 118.

Daubrée (1877) Comptes rendu de l’Académie des sciences de Paris: 84: 69 (as stagmatite).

Biltz and Birk (1924) Zeitschrift für anorganische und allgemeine Chemie, Hamburg, Leipzig: 134: 125.

Wooster (1932) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 83: 35.

Palache, Charles, Harry Berman & Clifford Frondel (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: 47-48.

Journal of Applied Crystallography (1989): 22: 173.

Internet Links for Molysite

Localities for Molysite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
  • Western Antarctica
    • Antarctic Peninsula
      • South Shetland Islands
Viramonte, J.G., Sureda, R.J., Bossi, G.E., Fourcade, N.H., Omarini, R.H., Geochemical and mineralogical study of the high temperature fumaroles from Decepcion Island, South Shetland, Antarctica. Inst. Assoc. of Volc. and chemistry of the erath interior. Symposium Andean and Antarctic Volcanology Problems. Chile (1974).
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: 48.
Italy (TL)
  • 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: 48.
  • Sicily
    • Catania Province
      • Etna Volcanic 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: 48; AA. VV., 1996. Collezionare minerali. Hobby & Work.
    • Messina Province
      • Eolie Islands (Aeolian Islands)
        • Lipari
          • Vulcano Island
FOUQUÉ F.A. (1865) - Sur les phénomènes éruptifs de l'Italie Méridionale. - Comptes Rendus de Séances de l'Académie des Sciences de Paris - 41, 564-567
  • Tuscany
    • Pisa Province
      • Castelnuovo Val di Cecina
  • Meknès-Tafilalet Region
    • Khénifra Province
      • M'Rirt
Bull. Minéral. , 1984, 107, pp. 255-272.
  • Far-Eastern Region
    • Kamchatka Oblast'
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast'
Cesnokov, B., Kotrly, M. and Nisanbajev, T. (1998): Brennende Abraumhalden und Aufschlüsse im Tscheljabinsker Kohlenbecken - eine reiche Mineralienküche. Mineralien-Welt, 9 (3), 54-63 (in German).
  • Catalonia
    • Tarragona
      • Conca de Barberà
        • Vimbodí
          • Poblet Monastery
Bull. Minéral. , 1987, 110, pp. 603-611.
  • Oklahoma
    • Okmulgee Co.
Rocks & Minerals: 72(4): 252-264.
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