Senaite

senaite

ilmenite

rutile

magnetite

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.

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