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Laphamite Mineral Data
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General Laphamite Information
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 Chemical Formula: |
As2(Se,S)3 |
| Composition: |
Molecular Weight = 351.55 gm |
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Arsenic 42.62 % As |
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Selenium 50.54 % Se |
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Sulfur 6.84 % S |
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______ |
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100.00 % |
| Empirical Formula: |
As2Se2.25S0.75 |
| Environment: |
Secondary mineral formed as a sublimation product of a burning anthracite coal mine waste dump fire. |
| IMA Status: |
Approved IMA 1986 |
| Locality: |
Burnside, Northumberland County, Pennsylvania, USA. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Davis M. Lapham (1931-1974), former Chief Mineralogist of the Pennsylvania Geological Survey. |
| Name Pronunciation: |
Laphamite + Pronunciation  |
| Synonym: |
ICSD 29535 |
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PDF 26-123 |
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