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Cleusonite
A valid IMA mineral species
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![(Pb,Sr)(U4+,U6+)(Fe2+,Zn)2(Ti,Fe2+,Fe3+)18(O,OH)38](#"/photo-253454.html"><img src="/image.pl?url=https%3a%2f%2fwww.mindat.org%2fimagecache%2f70%2fb0%2f01892460017272470866559.jpg&f=jpg&w=240" alt="01892460017272470866559.jpg" /></a><div><b>Cleuson Lake, with mineral outcrop on the left</b><br /><br /><a href="/mt/?noimg=&dark=on&url=https%3a%2f%2fwww.mindat.org%2floc-68485.html">Cleuson lake, Nendaz, Conthey, Valais, Switzerland</a></div></div></div><div><div><span>Formula:</span><div class=){kind=link}
Name:
For the type locality.
Type Locality:
Pb analogue ofmapiquiroite. U analogue ofsenaite. Fe2+-◻-analogue ofmianningite. UFe-analogue ofalmeidaite. UFe2+-analogue ofgramaccioliite-(Y).
Cleusonite is partly metamict. The radiation damage results in macroscopic swelling (i.e., variable density and unit cell dimensions) and also makes the mineral appear optically isotropic. The calculated density and the crystallographical data given here are those of a crystal treated at 1000 °C (Wülser et al., 2005).
A large number of U-bearing "senaites" from Alpine localities later turned out to be cleusonite instead.
Cleusonite is partly metamict. The radiation damage results in macroscopic swelling (i.e., variable density and unit cell dimensions) and also makes the mineral appear optically isotropic. The calculated density and the crystallographical data given here are those of a crystal treated at 1000 °C (Wülser et al., 2005).
A large number of U-bearing "senaites" from Alpine localities later turned out to be cleusonite instead.