Gabbro norite

Introduction: Norite is a similar rock to gabbro but contains a different orthopyroxene called hypershene. Some deposits, where the rock is uniform and without blemishes or flaws, are quarried for dimension stone.

Distribution: In the Sinclair Sequence.

Composition: Plagioclase feldspars, clinopyroxene and some olivine, enstatite or augite.

Colouration: Both are dark rocks, usually black with occasional white flecks of plagioclase feldspar.

Uses: Tiles, tabletops, cladding and tombstones.