Sorosilicate (Si2O7 groups)
Specific gravity: 3.28
Hardness: 2½ to 3
Common impurities: Mg,H2O
Samfowlerite is a very rare silicate reported only from its type locality to date (June 2020).
The type locality is the Franklin mine, Franklin, Sussex County, New Jersey, USA.
Here samfowlerite occurs in andradite-lined vugs in granular willemite-franklinite-andradite ore from a metamorphosed stratiform zinc-manganese deposit (HOM, Webmin, Dana). It occurs as colourless crystal clusters up to 500 microns with individual crystals about 50 microns, in cavities on or next to cahnite crystals (Mindat). Associated minerals include andradite - grossular, cahnite, clinochlore, leucophoenicite, johnbaumite, baryte, franklinite and willemite (HOM, Mindat).
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