General terms applied to altered, basaltic igneous rock coloured Dark green by chlorite, actinolite or epidote
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Category: <span>G</span>
An instrument used to measure the density of underlying rock based on the level of gravitational variance
A dark grey, coarse grained sedimentary sandstone rock frequently occurring as thick strata interbedded with marine shale, thought to derive from submarine compaction of lava flows
A term used to describe a placer mine where free gold is collected from loose gravel, sand and soil.
A hexagonal and trigonal form of native carbon
Term used to describe a rock whose texture is influenced by the abundance of mineral grains between 2mm to 1cm.
A common coarse-grained igneous rock mainly comprised of quartz, feldspar and mica
A sample of outcropped mineral collected for analysis and determination of its primary and trace constituents
Rust coloured staining caused by oxidation of iron suphides
A brassy, yellow coloured metal, being very dense, ductile and malleable, transported to the earths surface by the movement of often siliceous volcanic fluids and frequently found freed from its crustal origin by erosion. Used as currency and considered precious since the recording of human civilization