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Formula: Ca4Si6O16(OH)2(H2O)2.(Ca.5H2O)
Phyllosilicate (sheet silicate), tobermorite supergroup
Crystal System: Orthorhombic
Specific gravity: 2.02 to 2.20 measured, 2.27 calculated
Hardness: 4
Streak: White
Colour: White to pink to red-brown
Environments
Metamorphic environments
Hydrothermal environments
Plombièrite occurs in skarns and as deposits from thermal waters
(Dana).
Localities
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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