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It is the area where a particular mineral is found.
It is an amorphous, yellow to red substance that is composed of iron
compounds, like hematite and limonite.
It is a name given to a three dimensional polyhedron which is a
combination of a cube and 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.
It is the synonym of sulfuric acid.
It is the synonym of greasy luster.
It is a period of geological time which is from 28.5 to 23.8 million
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
One which is not able to transmit light, hence disabling it to let an
object be seen through it.
It is the physical properties of a mineral or gem having to do with
optics, like dispersion, absorption spectra, regfractive index,
asterims, and dichroism.
It is a period of geological time which extends from 495 to 440 million
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.