Laubmannite (of Moore) : (Fe3+,Fe2+,M)8+x(OH,H2O)9(H2O)2(PO4)5, M = Fe3+, Cu2+ or other metal cation, x ~ 0.1.
Rockbridgeite : Fe2+Fe3+4(PO4)3(OH)5
Dufrénite : Ca0.5Fe2+Fe3+5(PO4)4(OH)6·2H2O
Mindat locality:
Photo added to mindat.org
“Bands of black/brown rockbridgeite with green/brown laubmannite and darker green/brown dufrenite, with limonite and quartz.
Obtained from Art Smith in the 1980's”
Jeff Weissman - 4th February 2011
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