minerals (or metallic ores):
Minerals that contain metallic element in their composition
(i.e. pyrite, FeS2).
minerals (or non-metallic minerals): Any rock, mineral or
other naturally occurring substance of economic value, exclusive
of metallic ores, mineral fuels, and gemstones.
A brownish-black to iron-black mineral of the spinel group (Fe,Mg)(Cr,Al)2O4.
A mineral compound characterised by the linkage of sulphur with
a metal (i.e. pyrite, FeS2).
A commercial term applied to a group of silicate minerals that
readily separate into thin fibres that are flexible, heat
resistant and chemically inert.
An earthy red, yellow or brown iron oxide that is used as a
A soft, plastic, light-coloured rock composed essentially of
clay minerals of the montorillonite group plus colloidal silica,
and produced by chemical alteration of glassy igneous material.
Any of several hard, inert materials, such as sand, gravel or
crushed stone, used for mixing with a cementing or bituminous
material to form concrete, mortar or plaster.
rocks: A rock
formed at considerable depth by crystallisation (solidification)
of magma and/or by chemical alteration.
Crystallisation of naturally occurring mobile molten rock
material generated within the Earth, from which igneous rocks
are thought to have been derived through solidification and
crust: The type
of Earth’s crust (outer layer), which underlies the ocean
basins. It is about 5-10 km thick and has a density of about 3
hypothesis that the oceanic crust is increasing by convective
upwelling of magma along the mid-oceanic ridges (a continuous
median mountain range extending through the North and South
Atlantic Oceans, the Indian Ocean and the South Pacific Ocean,
producing new crustal material), and the moving-away of the new
material at a rate of 1 - 10 cm per year.
white, grey or greenish mineral which is highly fibrous and a
silky variety of serpentine.
It constitutes the most important type of asbestos.
Serpentinisation is the product of hydration of the harzburgite
(rock type), which produces a group of minerals of the
serpentinite that have the same chemical composition with the
parent rock (harzburgite), but occupy a larger volume and have a
much lower specific gravity.
Serpentinisation occurs from hydrothermal fluids that
circulate in the parent rock along fractures.
A limestone consisting of predominantly (more than 50%) calcite
particles of sand size (consolidated calcareous sand).
A group of clay minerals.
verde: In Cyprus
it is the mineral celadonite, which is a soft green or grey-green
earthy mineral, consisting of a hydrous silicate of iron,
magnesium, and potassium, and generally occurring in cavities in
basaltic rocks; a synonym for green earth. Generally, any of
various naturally occurring silicates used mainly as bases for
green basic dyes and pigments.
The group of mafic and ultramafic igneous rocks. (Mafic: This is
the composition of an igneous rock, which contains
ferromagnesian and dark-coloured minerals. Ultramafic: This is
the composition of an igneous rock, which has been composed
chiefly by mafic minerals).