Formula :
Ca7[CO3/Si6O18] * 2 H2O
System: monoclinic Hardness:4½-5 Rarity:rare
Strunz id:VIII/F.21-20 -
SILICATES
Name origin: Named by Cecil Edgar Tilley (Professor of Petrology and Geology at Cambridge University) in 1930 after its discovery locality, Scawt Hill, Larne, Co. Antrim, Northern Ireland, UK.
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