A general term applied to the replaceable wearing parts of machines which come into contact with excavated material, notably bucket teeth edges and ripping blades.
Sandstone with angular, usually coarse grains.
General term for basic and intermediate igneous rocks in which metamorphism has produced abundant chlorite and epidote.
- Sand or sandstone coloured with glauconite.
- Lower and upper subdivision of Cretaceous rocks often containing glauconite.
Metamorphic rock of even-sized granular minerals.
Igneous rock of medium grain size; contains abundant quartz and plagioclase over orthoclase; also dark coloured minerals (eg hornblende, biotite); an igneous rock with mineralogy intermediate between granite and diorite.
- Degree of fineness or coarseness of texture.
- Quarrying term, cleavage.
- Direction along which igneous rocks can be split.
Hydrous silicate of iron and potassium with magnesium and aluminium, occurring in many sandstones, giving them a green colour.
Usually red gemstone, metamorphic mineral.
Coarse-grained, plutonic rock, consisting essentially of calcic plagioclase and pyroxene, sometimes with olivine.