Phyllosilicate (sheet silicate), tobermorite group
Specific gravity: 2.018
Colour: White to pink to red-brown
Plombièrite occurs in skarns and as deposits from thermal waters
At the type locality, Plombières-les-Bains Thermal Springs, Plombières-les-Bains, Épinal, Vosges, Grand Est, France, plombièrite occurs as a gelatinous substance which hardens in air, formed from thermal waters and associated with zeolites (HOM).
At Ballycraigy, Larne, County Antrim, Northern Ireland, UK, plombièrite occurs as a natural gel formed from hydration of bredigite and larnite at a dolerite-chalk contact (HOM).
At the Crestmore quarries, Crestmore, Riverside county, California, USA, plombièrite occurs in vesuvianite (Webmin).
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