The specimen is roughly 4 x 5 x 3 cm. Found Sept 1996. MOB coll. Ferroceladonite (the green stuff) is not really common at MSH (Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada). But when found it covers everything! Here it is covering smoky quartz xls (to about 1 cm) and microcline. The broken smoky quartz xls along the edges look almost black. — Photo: Modris Baum · CC0
Ferroceladonite
Ferroceladonite is an IMA-recognized mineral species in the silicate class, with the chemical formula KFe²⁺Fe³⁺Si₄O₁₀(OH)₂.
It crystallizes in the monoclinic crystal system (space group C2/m). It is a member of the Mica structural group.
IMA symbol Fcel, IMA status: approved, named in 1995.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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