Wiktionary
tobermorite
n. (context mineralogy English) An orthorhombic-disphenoidal mineral containing aluminum, calcium, hydrogen, oxygen, and silicon.
Wikipedia
Tobermorite
Not to be confused with torbernite, a hydrated copper uranyl phosphate.
Tobermorite is a calcium silicate hydrate mineral with chemical formula: CaSiO(OH)·4HO or CaSi(O,OH)·5HO.
Two structural varieties are distinguished: tobermorite-11 Å and tobermorite-14 Å. Tobermorite occurs in hydrated cement paste and can be found in nature as alteration mineral in metamorphosed limestone and in skarn. It has been reported from the Maqarin Area of north Jordan and in the Crestmore Quarry near Crestmore Heights, Riverside County, California.
Tobermorite was first described in 1880 for an occurrence in Scotland, on the Isle of Mull, around the locality of Tobermory.