Vertumnite

vertumnite

tobermorite

ettringite

Images

Formula: Ca₄Al₄Si₄O₆(OH)₂₄.3H₂O
Hydrated phyllosilicate (sheet silicate)
Crystal System: Monoclinic
Specific gravity: 2.15 measured, 2.15 calculated
Hardness: 5
Streak: White
Colour: Colourless, green
Solubility: Soluble in cold hydrochloric acid
Common impurities: Sr,Ba,Na,K,P
Environments

Volcanic igneous environments
Metamorphic environments

Localities

At the type locality, the Campomorto Quarry, Pietra Massa Locality, Montalto di Castro, Viterbo Province, Lazio, Italy, vertumnite has been found as transparent, flattened, hexagonal prisms, up to 4 mm thick, resting on tobermorite in a cavity in phonolite, and also associated with ettringite (Mindat).
Vertumnite from Campomorto - Image

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