Global InformationWaylandite information
| Waylandite | |
|---|---|
 | |
| General | |
| Category | Mineral |
| Formula (repeating unit) | BiAl3(PO4)2(OH)6 |
| IMA symbol | Way |
| Strunz classification | 08.BL.13 |
| Dana classification | 41.05.12.01 |
| Crystal system | Trigonal |
| Crystal class | Hexagonal scalenohedral H-M Symbol: 3m (3 2/m) |
| Space group | R3m |
| Unit cell | 681.38 |
| Identification | |
| Formula mass | 581.91 |
| Color | Colorless, white, pale blue, pale brown |
| Twinning | Cyclic |
| Fracture | Irregular Uneven (when massive) |
| Mohs scale hardness | 4 - 5 |
| Luster | Vitreous, dull |
| Streak | White |
| Diaphaneity | Translucent |
| Specific gravity | 4.08 |
| Density | 4.08 |
| Optical properties | Uniaxial(+) |
| Refractive index | nω = 1.748 nε = 1.774 |
| Birefringence | 0.026 |
Waylandite is the phosphate analogue of arsenowaylandite and the aluminum analogue of zaïrite. The mineral was approved by the IMA in 1962, and was published the same year. Waylandite was named in honor of Edgar James Wayland. It is a member of the alunite supergroup, and a member of the plumbogummite – also known as crandallite – group.[1] So far, only two bismuth-bearing members of the alunite supergroup are known, one of which is waylandite, alongside its ferric iron analogue zaïrite.[2]
- ^ "Waylandite". www.mindat.org. Retrieved 2023-02-21.
- ^ J. Mills, Stuart; R. Kampf, Anthony; Raudsepp, Mati; D. Birch, William. "The crystal structure of waylandite from Wheal Remfry, Cornwall, United Kingdom". Miner Petrol.