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Steacyite
Steacyite
is a
complex
silicate mineral
containing
thorium
and
uranium
;
formula
K
variable
2
Si
8
O
20
. It forms small
brown
or
yellow green
crystals
, often
cruciform
twinned
crystals. It is
radioactive
. It was
discovered
at
Mont-Saint-Hilaire, Quebec
in
1982
and is named after
Harold Robert Steacy
,
mineralogist
.