- Muscovite Ps. After Orthoclase
- Cabinet, 9.9 x 5.0 x 4.3 cm
- Llallagua, La Joya district, Cercado Province, Oruro Department, Bolivia
- Ex. Philadelphia Academy of Natural Sciences
A single crystal of orthoclase has been pseudomorphed to muscovite, according to this label from the 4th Vaux expedition in 1929-1930..