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Orpiment, also known as yellow arsenic blende, is a deep-colored, orange-yellow arsenic sulfide mineral with formula As2S3. It is found in volcanic fumaroles, low-temperature hydrothermal veins, and hot springs and may be formed through sublimation.
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| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Orpiment | 2V angle | Measured: 30° to 76°, Calculated: 62° | 1.00 | infobox |
| Orpiment | Birefringence | δ = 0.620 | 1.00 | infobox |
| Orpiment | Category | Sulfide mineral | 1.00 | infobox |
| Orpiment | Cleavage | Perfect on {010}, imperfect on {100}; | 1.00 | infobox |
| Orpiment | Color | Lemon-yellow to golden or brownish yellow | 1.00 | infobox |
| Orpiment | Crystal class | Prismatic (2/m) (same H-M symbol) | 1.00 | infobox |
| Orpiment | Crystal habit | Commonly in foliated columnar or fibrous aggregates; may be reniform or botryoidal; also granular or powdery; rarely as prismatic crystals | 1.00 | infobox |
| Orpiment | Crystal system | Monoclinic | 1.00 | infobox |
| Orpiment | Diaphaneity | Transparent | 1.00 | infobox |
| Orpiment | Dispersion | r > v, strong | 1.00 | infobox |
| Orpiment | Formula | As2S3 | 1.00 | infobox |
| Orpiment | IMA symbol | Orp | 1.00 | infobox |
| Orpiment | Luster | Resinous, pearly on cleavage surface | 1.00 | infobox |
| Orpiment | Mohs scale hardness | 1.5–2 | 1.00 | infobox |
| Orpiment | Optical properties | Biaxial (−) | 1.00 | infobox |
| Orpiment | Pleochroism | In reflected light, strong, white to pale gray with reddish tint; in transmitted light, Y = yellow, Z = greenish yellow | 1.00 | infobox |
| Orpiment | Refractive index | nα = 2.400 nβ = 2.810 nγ = 3.020 | 1.00 | infobox |
| Orpiment | Space group | P21/n | 1.00 | infobox |
| Orpiment | Specific gravity | 3.49 | 1.00 | infobox |
| Orpiment | Streak | Pale lemon-yellow | 1.00 | infobox |
| Orpiment | Strunz classification | 2.FA.30 | 1.00 | infobox |
| Orpiment | Tenacity | Sectile | 1.00 | infobox |
| Orpiment | Twinning | On {100} | 1.00 | infobox |
| Orpiment | Unit cell | a = 11.475(5), b = 9.577(4) c = 4.256(2) [Å], β = 90.45(5)°; Z = 4 | 1.00 | infobox |
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