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Molysite

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Formula:
FeCl3
Colour:
Yellow, brown-red, purple-red
Specific Gravity:
2.9
Crystal System:
Hexagonal
Name:
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.


Hide all sections | Show all sections

Classification of MolysiteHide

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

3 : HALIDES
A : Simple halides, without H2O
C : M:X = 1:3
9.3.1.1

9 : NORMAL HALIDES
3 : AX3
8.11.1

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
11 : Halides of Fe and Ni

Physical Properties of MolysiteHide

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

Optical Data of MolysiteHide

Type:
Uniaxial (-)

Chemical Properties of MolysiteHide

Formula:
FeCl3
IMA Formula:
Fe3+Cl3

Crystallography of MolysiteHide

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

Type Occurrence of MolysiteHide

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

Synonyms of MolysiteHide

Other Language Names for MolysiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Hydrokenoralstonite1 photo of Molysite associated with Hydrokenoralstonite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

3.AC.05ZharchikhiteAlF(OH)2Mon.
3.AC.15Fluocerite-(Ce)(Ce,La)F3Trig. 3m (3 2/m) : P3c1
3.AC.15Fluocerite-(La)(La,Ce)F3Trig. 3m (3 2/m) : P3c1
3.AC.20GananiteBiF3

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

8.11.2HydromolysiteFeCl3 · 6H2O
8.11.3RokühniteFeCl2 · 2H2OMon.
8.11.4DouglasiteK2[Fe2+Cl4(OH2)2]Mon.
8.11.5ErythrosideriteK2[Fe3+Cl5(H2O)]Orth. mmm (2/m 2/m 2/m) : Pnma
8.11.6RinneiteK3Na[FeCl6]Trig. 3m (3 2/m) : R3c
8.11.7Kremersite(NH4,K)2[Fe3+Cl5(H2O)]Orth. mmm (2/m 2/m 2/m)
8.11.8IowaiteMg6Fe3+2(OH)16Cl2 · 4H2OTrig. 3m (3 2/m) : R3m
8.11.9NickelbischofiteNiCl2 · 6H2OMon.
8.11.10Lawrencite(Fe2+,Ni)Cl2Trig. 3m (3 2/m) : R3m

Other InformationHide

Thermal Behaviour:
Melting point = 282°.
Notes:
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 MolysiteHide

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

Localities for MolysiteHide

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.
Antarctica
 
  • 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).
Iceland
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
http://www.mindat.org/photo-166443.html
Morocco
 
  • Béni Mellal-Khénifra Region
    • Khénifra Province
      • M'Rirt
Bull. Minéral. , 1984, 107, pp. 255-272.
Russia
 
  • Far-Eastern Region
    • Kamchatka Oblast'
http://www.kscnet.ru/ivs/conferences/kasp/JKASP04_circular2.pdf
  • 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).
Spain
 
  • Catalonia
    • Tarragona
      • Conca de Barberà
        • Vimbodí
          • Poblet Monastery
Bull. Minéral. , 1987, 110, pp. 603-611.
USA
 
  • Oklahoma
    • Okmulgee Co.
Rocks & Minerals: 72(4): 252-264.
Mineral and/or Locality  
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