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Mineral Development Act (Northern Ireland) 1969

1N.I.Conglomerate; grit (or gritstone), sandstone, greywacke, siltstone, mudstone, shale (excluding alum shale and oil shale), slate, limestone (including chalk), dolomite; schist (all varieties except graphite schist), gneiss; granite and porphyry (all varieties except decomposed granite in the form of clay); rhyolite (except decomposed rhyolite in the form of clay); aplite, syenite (and related rocks), basalt (and related rocks), picrite (and related rocks).