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Laphamite

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Formula:
As2(Se,S)3
System:
Monoclinic
Colour:
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

Approved 1985
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
2.11.6.1

2 : SULFIDES
11 : AmBnXp, with (m+n):p = 2:3
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

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:
As2(Se,S)3
Essential elements:
All elements listed in formula:

Relationship of Laphamite to other Species

2.FA.05DuranusiteAs4S
2.FA.10DimorphiteAs4S3
2.FA.15bPararealgarAs4S4
2.FA.15aRealgarAs4S4
2.FA.15cUM1970-19-S:AsAs4S4
2.FA.15dUM1970-18-S:AsAs4S4
2.FA.20AlacrániteAs8S9
2.FA.25UzoniteAs4S5
2.FA.30OrpimentAs2S3
2.FA.35GetchelliteAsSbS3
2.FA.40Wakabayashilite[(As,Sb)6S9][As4S5]
3.7.1PatróniteVS4
3.7.2DuranusiteAs4S
3.7.3DimorphiteAs4S3
3.7.4RealgarAs4S4
3.7.5PararealgarAs4S4
3.7.6AlacrániteAs8S9
3.7.7UzoniteAs4S5
3.7.8OrpimentAs2S3
3.7.9Jeromite
3.7.11GetchelliteAsSbS3
3.7.12Wakabayashilite[(As,Sb)6S9][As4S5]
3.7.13PääkköneniteSb2AsS2
3.7.14StibniteSb2S3
3.7.15MetastibniteSb2S3
3.7.16TellurantimonySb2Te3
3.7.17BismuthiniteBi2S3
3.7.18NevskiteBi(Se,S)
3.7.19GuanajuatiteBi2Se3
3.7.21IkunoliteBi4(S,Se)3
3.7.22LaitakariteBi4Se2S
3.7.23PoubaitePbBi2(Se,Te,S)4
3.7.24TellurobismuthiteBi2Te3
3.7.25SoučekitePbCuBi(S,Se)3
3.7.26TsumoiteBiTe
3.7.27PilseniteBi4Te3
3.7.28HedleyiteBi7Te3
3.7.29TetradymiteBi2Te2S
3.7.30JoséiteBi4TeS2
3.7.31Joséite-BBi4Te2S
3.7.32IngoditeBi2TeS
3.7.33SulphotsumoiteBi3Te2S
3.7.34KawazuliteBi2Te2Se
3.7.36SkippeniteBi2TeSe2
3.7.37KochkaritePbBi4Te7
3.7.38Rucklidgeite(Bi,Pb)3Te4
3.7.39AleksitePbBi2Te2S2
3.7.40JunoiteCu2Pb3Bi8(S,Se)16

Other Names for Laphamite

Name in Other Languages:
German:Laphamit
Spanish:Laphamita

Other Information

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 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

Localities for Laphamite

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.
USA (TL)
 
  • Pennsylvania
    • Northumberland Co.
Min.Mag.: 50:279 (1986), Dunn, et al.
Mineral and/or Locality  
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