celadonite

{{Infobox mineral | name = Celadonite | boxbgcolor =#288436 | boxtextcolor = #fff | image = Celadonite-Heulandite-Ca-pkn55b.jpg | alt = | caption = Green crystals of heulandite which owe their green colour to many tiny inclusions of celadonite | category = Phyllosilicate minerals | group = Mica group, dioctahedral mica group, celadonite subgroup | formula = {{chem2|K(MgFe^{3+}◻)(Si4O10)(OH)2}} | IMAsymbol=Cel | system = Monoclinic | class = Spheroidal (2) (same H-M symbol) | symmetry = C2 | color =Blue-green to olive to applegreen | cleavage =perfect on {001} | tenacity =Fragile | mohs =2 | luster =Waxy, dull, earthy | diaphaneity =Translucent | gravity =2.95 - 3.05 | density =2.95 - 3.05 | opticalprop =Biaxial (-) | pleochroism =Visible | 2V =5°- 8° | impurities =Mn, Na, Ca | other =25px Radioactive 9.11% (K) | references = }}

Celadonite is a mica group mineral, a phyllosilicate of potassium, iron in both oxidation states, aluminium and hydroxide with formula {{chem2|K(MgFe^{3+}◻)(Si4O10)(OH)2}}.