Larnite is a calcium with formula: Ca2SiO4. It is the calcium member of the olivine group of minerals.
It was first described from an occurrence at Scawt Hill , Larne in 1929 by Cecil Edgar Tilley it occurs with wollastonite , perovskite and gehlenite limestones intrusives.
Dicalcium silicate is chemically, β–Ca2SiO4, sometimes represented by the formula 2CaO·SiO2. When used in the cement industry, the mineral is usually referred to as belite.