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Occurrence
It is the area where a particular mineral is found.
Ochre
It is an amorphous, yellow to red substance that is composed of iron
compounds, like hematite and limonite.
Octacube
It is a name given to a three dimensional polyhedron which is a
combination of a cube and octahedron.
Octahedron
It is a term given to the eight sided polyhedron. All the sides of it
are equidimensional and bisect at the same angle. Minerals of such shape
belong to the isometric system. It is also known as Octahedra or
Octahedrals in plural forms.
Oil
of Vitriol
It is the synonym of sulfuric acid.
Oily
(luster)
It is the synonym of greasy luster.
Oligocene
It is a period of geological time which is from 28.5 to 23.8 million
years ago.
Opalescence
It is the effect which is seen in few minerals, like opal, causing it
to exhibit a glimmer of different colors if rotated or seen in different
angles.
Opaque
One which is not able to transmit light, hence disabling it to let an
object be seen through it.
Optical
properties
It is the physical properties of a mineral or gem having to do with
optics, like dispersion, absorption spectra, regfractive index,
asterims, and dichroism.
Ordovician
It is a period of geological time which extends from 495 to 440 million
years ago.
Ore
It is for those material that has a valuable constituent, commonly a
precious metal, giving it a value and making it a profitable for
extraction. Example: Calaverite, extracted for the gold it contains.
