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Laphamite

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Burnside, Northumberland Co., Pennsylvania, USA
© Christian Rewitzer

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Formula:
As
 
2
(Se,S)
 
3
System:MonoclinicColour:dark red
Hardness:1 - 2
Name:For US mineralogist Davis M. Lapham (1931-1974), former Chief Mineralogist of the Pennsylvania Geological Survey.
This page provides mineralogical data about Laphamite.

Classification of Laphamite

IMA status:Approved 1985
Strunz 8th edition ID:2/F.02-80
Nickel-Strunz 10th (pending) edition ID:2.FA.30

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:2.11.6.1

2 : SULFIDES
11 : AmBnXp, with (m+n):p = 2:3
Hey's CIM Ref.:3.7.10

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 Laphamite

Type Locality:Burnside, Northumberland Co., Pennsylvania, USA
Year of Discovery:1985

Physical Properties of Laphamite

Colour:dark red
Streak:red-orange
Hardness (Mohs):1 - 2
Cleavage:Perfect

Crystallography of Laphamite

Crystal System:Monoclinic
Cell Parameters:a = 11.86Å, b = 9.75Å, c = 4.26Å
β = 90.17°
Ratio:a:b:c = 1.216 : 1 : 0.437
Unit Cell Volume:V 492.60 ų (Calculated from Unit Cell)

Chemical Properties of Laphamite

Formula:
As
 
2
(Se,S)
 
3
Essential elements:As, Se
All elements listed in formula:As, S, Se

Relationship of Laphamite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
2.FA.05Duranusite
As
 
4
S
2.FA.10Dimorphite
As
 
4
S
 
3
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.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
3.7.3Dimorphite
As
 
4
S
 
3
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
3.7.11Getchellite
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 Laphamite

Synonyms:
IMA1985-021
Other Languages:
German:Laphamit
Russian:Лафамит
Spanish:Laphamita

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 Laphamite

Reference List:

- +
Dunn, P. J., Peacor, D. R., Criddle, A. J. and Finkelman, R. B. (1986): Laphamite, an arsenic selenide analogue of orpiment, from burning anthracite deposits in Pennsylvania. Mineralogical Magazine, 50, 279-282. [Abs. in: American Mineralogist (1987): 72: 1024-1025.]

Stergiou, A.C. and P.J. Rentzeperis (1986) The crystal structue of arsenic selenide, As2Se3. Zeits. Kristallogr., 173, 185–191.



Internet Links for Laphamite

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    • Localities for Laphamite

    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.
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    USA
     
    • Pennsylvania
      • Northumberland Co.
    		Min.Mag.: 50:279 (1986), Dunn, et al.
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