| Atelestite | |
|---|---|
 Atelestite crystals | |
| General | |
| Category | Mineral |
| Formula (repeating unit) | Bi2(AsO4)O(OH) |
| IMA symbol | Ale |
| Identification | |
| Color | Sulphur-yellow to yellowish-green, wax-yellow, yellow-brown |
| Cleavage | {001}, indistinct |
| Mohs scale hardness | 4.5-5 |
| Luster | Adamantine, Resinous |
| Specific gravity | 7.14 |
Atelestite is an arsenate mineral with the chemical formula Bi2(AsO4)O(OH). Its type locality is Erzgebirgskreis, Saxony, Germany. [1]
Mixite is a rare copper bismuth arsenate mineral with formula: BiCu6(AsO4)3(OH)6·3(H2O). It crystallizes in the hexagonal crystal system typically occurring as radiating acicular prisms and massive encrustations. The color varies from white to various shades of green and blue. It has a Mohs hardness of 3.5 to 4 and a specific gravity of 3.8. It has an uneven fracture and a brilliant to adamantine luster.
Atelestidae is a family of flies in the superfamily Empidoidea. The four genera were placed in a separate family in 1983; they were formerly either in Platypezidae or considered incertae sedis. While they are doubtless the most basal of the living Empidoidea, the monophyly of the family is not fully proven. The genus Nemedina seems to represent a most ancient lineage among the entire superfamily, while Meghyperus is probably not monophyletic in its present delimitation, and it is liable to be split up eventually, with some species being placed elsewhere. In 2010, the genus Alavesia, previously only known from Cretaceous fossils, was found alive in Namibia, subsequent species were also described from Brazil.
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