In lenses and bands of barium silicate metasediments developed under hornblende-pyroxene hornfels facies near the contact with granite or granodiorite.
IMA Status:
Approved IMA 1981
Locality:
From Big Creek and Rush Creek, Fresno Co., and on Trumbull Peak, near Incline, Marisopa Co., California, USA. Link to MinDat.org Location Data.
Name Origin:
To honor Dr. John T. Alfors (1930- ), geologist, California Division of Mines, for his work on the type locality.
Chemical Formula: 