| Reference Type | Journal (article/letter/editorial) |
|---|
| Title | Laphamite, an arsenic selenide analogue of orpiment, from burning anthracite deposits in Pennsylvania |
|---|
| Journal | Mineralogical Magazine | ISSN | 0026-461X |
|---|
| Authors | Dunn, Pete J. | Author |
|---|
| Peacor, Donald R. | Author |
| Criddle, Alan J. | Author |
| Finkelman, Robert B. | Author |
| Year | 1986 (June) | Volume | 50 |
|---|
| Issue | 356 |
|---|
| Publisher | Mineralogical Society |
|---|
| Download URL | https://rruff.info/doclib/MinMag/Volume_50/50-356-279.pdf+ |
|---|
| DOI | doi:10.1180/minmag.1986.050.356.11Search in ResearchGate |
|---|
| Generate Citation Formats |
|---|
| Mindat Ref. ID | 3848 | Long-form Identifier | mindat:1:5:3848:9 |
|---|
|
| GUID | 0 |
|---|
| Full Reference | Dunn, Pete J., Peacor, Donald R., Criddle, Alan J., Finkelman, Robert B. (1986) Laphamite, an arsenic selenide analogue of orpiment, from burning anthracite deposits in Pennsylvania. Mineralogical Magazine, 50 (356) 279-282 doi:10.1180/minmag.1986.050.356.11 |
|---|
| Plain Text | Dunn, Pete J., Peacor, Donald R., Criddle, Alan J., Finkelman, Robert B. (1986) Laphamite, an arsenic selenide analogue of orpiment, from burning anthracite deposits in Pennsylvania. Mineralogical Magazine, 50 (356) 279-282 doi:10.1180/minmag.1986.050.356.11 |
|---|
| In | (1986, June) Mineralogical Magazine Vol. 50 (356) Mineralogical Society |
|---|
| Abstract/Notes | AbstractLaphamite, ideally As2(Se,S)3, is monoclinic, P21/n, with a = 11.86(1), b = 9.756(9), c = 4.265(9) Å, β = 90.17°, V = 493.5 Å3, Z = 4, D (calc.) = 4.60, D (meas.) = 4.5(1) g/cm3. Microprobe analysis yielded: As 47.0, Se 43.7, S 8.7, sum = 99.4 wt. %. In plane polarized light in polished section at about 3200 K laphamite is moderately bireflectant from white to grey. Reflection pleochroism is absent but fiery red internal reflections are characteristic as are golden yellow reflections along scratches. Anisotropy is moderate with grey rotation tints, masked in some sections by internal reflections. Reflectance spectra in air and oil between 400 and 700 nm are given. Colour values for the CIE illiminant C in air are, for R1 followed by R2: Y% 29.0, 33.5, λd 480, 478; Pe% 9.1, 8.7. Laphamite forms dark red crystals, up to 5.0 mm, associated with orpiment, arsenolite, and an unnamed phase, NH4AlF4, in a burning coal waste-dump at Burnside, Northumberland County, Pennsylvania. |
|---|
These are possibly similar items as determined by title/reference text matching only.
