Trisha Shetty (Editor)

Celadonite

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Category
  
MicasPhyllosilicate

Space group
  
C2

Crystal system
  
Monoclinic

Celadonite

Formula(repeating unit)
  
K(Mg,Fe)(Fe,Al)[Si4O10](OH)2

Crystal class
  
Spheroidal (2)(same H-M symbol)

Celadonite is a mica group mineral, a phyllosilicate of potassium, iron in both oxidation states, aluminium and hydroxide with formula: K(Mg,Fe2+)(Fe3+,Al)[Si4O10](OH)2.

It crystallizes in the monoclinic system and usually forms massive aggregates of prismatic crystallites or in dull clay masses. It is soft with a Mohs hardness of 2 and a specific gravity of 3. Typically occurs as dull gray-green to bluish green masses. It forms vesicle fillings and linings in altered basaltic lavas.

It was first described in 1847 on Monte Baldo, near Verona, Italy. The name is from the French celadon, for sea-green. It is one of two minerals, along with glauconite, used in making the pigment known as green earth.

References

Celadonite Wikipedia


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