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Heinrichite 
Summary
Heinrichite is a monoclinic-prismatic containing arsenic, barium, hydrogen, oxygen, and uranium. The mineral is named after Eberhardt William Heinrich (1918–1991) who first noted it in 1958 in the U.S. State of Oregon.
| Heinrichite | |
|---|---|
 Green heinrichite crystals and pale yellow abernathyite crystals | |
| General | |
| Category | Phosphate mineral |
| Formula (repeating unit) | Ba(UO2)2(AsO4)2·10H20 |
| IMA symbol | Hrc[1] |
| Strunz classification | 8.EB.05 |
| Dana classification | 40.2a.9.1 |
| Crystal system | Monoclinic |
| Crystal class | Strunz |
| Unit cell | a = 7.155 Å, b = 7.134 Å, c = 21.29 Å β = 104.171 |
| Identification | |
| Color | Pale yellow, pale green |
| Streak | Pale yellow |
| Optical properties | uniaxial (−) |
| Refractive index | nω = 1.605 nε = 1.573 |
| Birefringence | 0.032 |
| Ultraviolet fluorescence | Yellow-green in longwave and shortwave UV[2] |
| Other characteristics |  Radioactive |
| References | [2] |
Description edit
Heinrichite is radioactive pale green, pale yellow mineral. Heinrichite fluoresces light-green in longwave and shortwave ultraviolet.[3] Because of its uranium content, the mineral is radioactive.[3]
References edit