PIRSA Minerals

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Extractive Mineral Commodities

Basalt Dark fine-grained volcanic rock
Calcrete Surface layer of rubbly or sheet limestone up to 2m thick, common throughout South Australia
Clay Natural plastic clay deposits deposited as sediment (minerals for refractory bricks, e.g. sillimanite or fire clay, are industrial minerals)
Includes white plastic clay and red plastic clay
Dolerite Dark, medium-grained igneous rock
Dolomite Sedimentary rock containing greater than 50% of the mineral dolomite (calcium magnesium carbonate)
Gabbro Dark coarse-grained igneous rock; includes norite (Black Granite from Black Hill)
Gneiss Banded or foliated metamorphic rock, usually of the same composition as granite
Granite Coarse-grained light-coloured igneous rock consisting chiefly of quartz, feldspar and mica
Gravel (natural) Creek or river gravel including buried deposits
Ironstone Lateritic soils and ironstone cappings
Limestone Sedimentary rock containing greater than 50% of the mineral calcite (calcium carbonate)
Marble Metamorphic rock formed by alteration of limestone or dolomite
Pegmatite Coarse-grained light-coloured crystalline rock composed chiefly of minerals found in granite
Quartzite Rock formed from the metamorphism of sandstone
Rhyolite Fine-grained volcanic rock similar to granite in composition
Sand Mortar, plaster and bricklaying sand; concrete sand; general filling, garden sand, paving and landscaping sand, loam; specification filling sand for pipeline trenches etc; road and track construction sand
Sandstone Sedimentary rock containing sand-sized particles mainly quartz
Schist Medium-grained to coarse-grained metamorphic rock composed of laminated layers of micas
Shale
Fine-grained sedimentary rock composed mainly of clay-sized particles that is easily split into thin layers
Shale - coloured Red-firing or other darker coloured-firing weathered shale
Shale - white White or cream, pale-firing weathered shale
Shell grit Sand made up on shell fragments
Siltstone Sedimentary rock composed mainly of silt-sized particle) that is not easily split into thin layers; they are intermediate between sandstones and shales
Slate Fine-grained metamorphic rock that splits into thin, smooth-surfaced layers