Story: Rock, limestone and clay

This kiln at Sandymount on the Otago Peninsula was built in 1865 by a Scotsman named McDonald. During the 19th century lime was burnt in small kilns such as this, near the limestone deposits. Limestone, which is mainly calcium carbonate (CaCO₃), was burnt to drive off carbon dioxide (CO₂), leaving calcium oxide (CaO) – otherwise known as burnt lime. Crushed limestone was used to improve pastures, and burnt lime was used to make a rather inferior mortar.

Castle Hill, Canterbury

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Taylor's lime works, Dunback

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