Images
Formula: Pb(Mn,Y,U)(Fe,Zn)2(Ti,Fe,Cr,V)18(O,OH)38
Multiple oxide, crichtonite group, forms a series with
gramaccioliite-(Y),
manganese-, yttrium-,
titanium-, chromium- and
vanadium-bearing mineral
Crystal System: Trigonal
Specific gravity: 5.204 to 5.301 measured, 5.23 calculated
Hardness: 6 to 6½
Streak: Brownish black
Colour: Black; oil-green to greenish black in transmitted light
May be RADIOACTIVE
Environments
Pegmatites
Hydrothermal environments
Senaite occurs in granite or
syenite
pegmatites, in a hydrothermal deposit and as a detrital
mineral. Associated minerals include ilmenite,
rutile, magnetite and
hematite
(HOM).
Localities
The type locality is Datas, Minas Gerais, Brazil.
Back to Minerals