Girish Mahajan (Editor)

Siderophyllite

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Category
  
Silicate mineral

Crystal system
  
Monoclinic

Strunz classification
  
9.EC.21

Space group
  
C2/m

Siderophyllite

Formula(repeating unit)
  
KFe2Al(Al2Si2)O10(F,OH)2

Crystal class
  
Prismatic (2/m)(same H-M symbol)

Siderophyllite is a rare member of the mica group of silicate minerals with formula KFe2+2Al(Al2Si2)O10(F,OH)2.

The mineral occurs in nepheline syenite pegmatites and granite and aplite greisens. It is associated with microcline and astrophyllite at Pikes Peak, Colorado. It is also found in the alkali pegmatites of Mont Saint-Hilaire, Quebec.

It was first described in 1880 for an occurrence near Pikes Peak, Colorado. The name derives from the Greek sideros, iron, and phyllon, leaf, in reference to its iron rich composition and perfect basal cleavage.

References

Siderophyllite Wikipedia


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