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Additional
biotite
English Wikipedia - The Free Encyclopedia
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Biotite
Biotite
is a common
phyllosilicate
mineral
within the
mica
group, with the approximate
chemical formula
. More generally, it refers to the dark mica series, primarily a
solid-solution
series between the
iron
-endmember
annite
, and the
magnesium
-endmember
phlogopite
; more
aluminous
end-members include
siderophyllite
. Biotite was named by
J.F.L. Hausmann
in 1847 in honor of the French
physicist
Jean-Baptiste Biot
, who, in 1816, researched the
optical properties
of
mica
, discovering many properties.
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