Hydrocalumite

hydrocalumite

ettringite

afwillite

portlandite

Images

Formula:Ca4Al2(OH)12(Cl,CO3,OH)2.4H2O
Hydroxide, hydrocalumite group
Specific gravity: 2.15
Hardness: 3
Streak: White
Colour: Colourless to light green
Environments

Metamorphic environments
Hydrothermal environments

Hydrocalumite is a late-stage hydrothermal mineral in skarn formed from contact metamorphism of limestone (Webmin). Associated minerals include afwillite, portlandite, ettringite, larnite, plombièrite, grossular variety hydrogrossular and calcite (HOM).

Localities

At Boisséjour, Beaumont, Puy-de-Dôme, Auvergne-Rhône-Alpes, France, hydrocalumite occurs with ettringite (Dana).

At the type locality, Scawt Hill, Larne, County Antrim, Ulster, Northern Ireland, UK, hydrocalumite occurs in vugs in larnite rock with afwillite, portlandite and ettringite (Dana, AM 20.316).

Back to Minerals