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Dimorphite

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Big Photo

Solfatara di Pozzuoli, Pozzuoli, Phlegrean Fields, Naples Province, Phlegrean Volcanic Complex, Campania, Italy
© Thomas Witzke

Show Dimorphite Photos (8)



Formula:
As
 
4
S
 
3
System:OrthorhombicColour:orange-yellow
Hardness:1½
Name:From the Greek for two and form, for the two forms that the mineral supposedly occurs in.
This page provides mineralogical data about Dimorphite.

Classification of Dimorphite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:2/F.02-20
Nickel-Strunz 10th (pending) edition ID:2.FA.10

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
F : Sulfides of arsenic, alkalies; sulfides with halide, oxide, hydroxide, H2O
A : With As, (Sb), S
Dana 8th edition ID:2.6.1.1

2 : SULFIDES
6 : AmBnXp, with (m+n):p = 4:3
Hey's CIM Ref.:3.7.3

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
7 : Sulphides etc. of V, As, Sb and Bi
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Type Occurrence of Dimorphite

Type Locality:Solfatara di Pozzuoli, Pozzuoli, Phlegrean Fields, Naples Province, Phlegrean Volcanic Complex, Campania, Italy
Geological Setting of type material:Fumarolic vent

Occurrences of Dimorphite

Geological Setting:Secondary zone of ore deposit.

Physical Properties of Dimorphite

Lustre:Adamantine
Diaphaneity (Transparency):Transparent
Colour:orange-yellow
Streak:yellow
Hardness (Mohs):1½
Tenacity:Brittle
Cleavage:None Observed
Density (measured):3.58 g/cm3
Density (calculated):3.60 g/cm3

Crystallography of Dimorphite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pnma {P21/n 21/m 21/a}
Space Group Setting:Pnma
Cell Parameters:a = 11.24Å, b = 9.90Å, c = 6.56Å
Ratio:a:b:c = 1.135 : 1 : 0.663
Unit Cell Volume:V 729.97 ų (Calculated from Unit Cell)
Z:4
Morphology:Dipyramidal crystals.

Optical Data of Dimorphite

Type:Biaxial (+)
Dispersion:strong

Chemical Properties of Dimorphite

Formula:
As
 
4
S
 
3
Essential elements:As, S
All elements listed in formula:As, S

Relationship of Dimorphite to other Species

Common Associates:
SulphurRealgarOrpiment
Related Minerals - Nickel-Strunz Grouping):

- +
2.FA.05Duranusite
As
 
4
S
2.FA.15bPararealgar
As
 
4
S
 
4
2.FA.15aRealgar
As
 
4
S
 
4
2.FA.15cUM1970-19-S:As
As
 
4
S
 
4
2.FA.15dUM1970-18-S:As
As
 
4
S
 
4
2.FA.20Alacránite
As
 
8
S
 
9
2.FA.25Uzonite
As
 
4
S
 
5
2.FA.30Laphamite
As
 
2
(Se,S)
 
3
2.FA.30Orpiment
As
 
2
S
 
3
2.FA.35Getchellite
AsSbS
 
3
2.FA.40Wakabayashilite
[(As,Sb)
 
6
S
 
9
][As
 
4
S
 
5
]
Related Minerals - Hey's Index Grouping:

- +
3.7.1Patrónite
VS
 
4
3.7.2Duranusite
As
 
4
S
3.7.4Realgar
As
 
4
S
 
4
3.7.5Pararealgar
As
 
4
S
 
4
3.7.6Alacránite
As
 
8
S
 
9
3.7.7Uzonite
As
 
4
S
 
5
3.7.8Orpiment
As
 
2
S
 
3
3.7.9Jeromite
3.7.10Laphamite
As
 
2
(Se,S)
 
3
3.7.11Getchellite
AsSbS
 
3
3.7.12Wakabayashilite
[(As,Sb)
 
6
S
 
9
][As
 
4
S
 
5
]
3.7.13Pääkkönenite
Sb
 
2
AsS
 
2
3.7.14Stibnite
Sb
 
2
S
 
3
3.7.15Metastibnite
Sb
 
2
S
 
3
3.7.16Tellurantimony
Sb
 
2
Te
 
3
3.7.17Bismuthinite
Bi
 
2
S
 
3
3.7.18Nevskite
Bi(Se,S)
3.7.19Guanajuatite
Bi
 
2
(Se,S)
 
3
3.7.21Ikunolite
Bi
 
4
(S,Se)
 
3
3.7.22Laitakarite
Bi
 
4
Se
 
2
S
3.7.23Poubaite
PbBi
 
2
(Se,Te,S)
 
4
3.7.24Tellurobismuthite
Bi
 
2
Te
 
3
3.7.25Součekite
PbCuBi(S,Se)
 
3
3.7.26Tsumoite
BiTe
3.7.27Pilsenite
Bi
 
4
Te
 
3
3.7.28Hedleyite
Bi
 
7
Te
 
3
3.7.29Tetradymite
Bi
 
2
Te
 
2
S
3.7.30Joséite
Bi
 
4
TeS
 
2
3.7.31Joséite-B
Bi
 
4
Te
 
2
S
3.7.32Ingodite
Bi
 
2
TeS
3.7.33Sulphotsumoite
Bi
 
3
Te
 
2
S
3.7.34Kawazulite
Bi
 
2
Te
 
2
Se
3.7.36Skippenite
Bi
 
2
TeSe
 
2
3.7.37Kochkarite
PbBi
 
4
Te
 
7
3.7.38Rucklidgeite
(Bi,Pb)
 
3
Te
 
4
3.7.39Aleksite
PbBi
 
2
Te
 
2
S
 
2
3.7.40Junoite
Cu
 
2
Pb
 
3
Bi
 
8
(S,Se)
 
16

Other Names for Dimorphite

Synonyms:
Dimorphine
Other Languages:
German:Dimorphin
Dimorphit
Russian:Диморфит
Simplified Chinese:硫砷矿
Spanish:Dimorphita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Dimorphite

Reference List:

- +
Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged, 834pp.: 197-198.

Neues Jahrbuch für Mineralogie, Monatshefte (1981): 416-432.

Zeitschrift für Kristallographie: 138: 161-166.

Internet Links for Dimorphite

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    • Localities for Dimorphite

    The 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.
    Hide Locality List
    (TL) indicates type locality. ? 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.
    Chile
     
    • Atacama Region
      • Copiapó Province
        • Tierra Amarilla
          • Pampa Larga district
            • Alacrán
    		Handbook of Mineralogy
    Greece
     
    • Attikí (Attica; Attika) Prefecture
      • Lavrion (Laurion; Laurium) District
        • Lavrion District Mines
          • Plaka
    		Katerinopoulos, A. (1996): Bisher nicht bekannte Minerale aus den Lavrion-Bergwerken. Lapis, 21 (11), 39; 62.
    No reference listed
    Italy
     
    • Campania
      • Phlegrean Volcanic Complex
        • Naples Province
          • Phlegrean Fields
            • Pozzuoli
    		Scacchi, A., (1852): Über die in den Fumarolen der phlegräischen Gefilde vorkommenden Substanzen, Journal für praktische Chemie, Vol. 55, 54-59
    Peru
     
    • Pasco department
      • Pasco province
        • Cerro de Pasco
    		No reference listed
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