Celadonite

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.

Additional recommended knowledge

Guide to balance cleaning: 8 simple steps

What is the Correct Way to Check Repeatability in Balances?

Correct Test Weight Handling Guide: 12 Practical Tips

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 Mt. Baldo, near Verona, Italy. The name is from the French celadon, for sea-green.