Home > Laskowski Ⅳ – July 13 > MS1879 Franciscanite
Franciscanite
- Pennsylvania mine
- Santa Clara County
- California
- U.S.A.
- 4.2 × 3.6 × 2.4 cm – Miniature specimen (fits into a 5 cm cube)
Franciscanite is a hydrous manganese vanadium silicate. Dunn et al. (1986) named the mineral for the Franciscan Complex, a heterogeneous geologic unit outcropping at the type locality, also the source of this sample.
Franciscanite forms a dull black bleb in matrix, marked by a green arrow. The matrix consists of massive sonolite and hausmannite; a red arrow indicates a particularly large sonolite mass. From the collection of E.R. Laskowski (1949-2020), a mining engineer who retired to Tucson, Arizona.
Price: $75
Item code: MS1879
For ordering, please use the order form.
