Home > Laskowski Ⅳ – July 13 > MS1879 Franciscanite


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

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