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It is term for the crystal habit which describes a flat, tough and
usually four sided crystal.
It is the property in some minerals which causes them discolor if
placed in certain environments. Silver is a good example that develops a
yellowish-black coating on its surface after being exposed to hydrogen
S). In the atmosphere, H2
S is present
in small quantity.
It is a group of silicate minerals having all the four oxygen atoms
from each tetrahedron sharing itself with an adjacent tetrahedron.
It is a mineral which is formed by the combination of tellurium with
another chemical like calaverite (AuTe2
It is the reaction of a mineral to certain stress.
It is the end of a crystal face, generally referring to its base.
Any mineral which has three axes, two of them equal in length and one
unequal and all the three axis are at 90° to each other.
It is four sided polyhedron. All the sides are equidimensional and
triangular shaped. Members belonging to it belongs to the isometric
system. Also known as Tetrahedra or Tetrahedrons in plural form.
It is the feel and appearance of a mineral, like color, crystal form,
It is term used to describe an object which has the ability to transmit
light through it. If any other object is placed in front of it, that
object can be seen, as if there is nothing interfering.
It is a term used to describe an object which transmits light, but
partly. Objects placed in front of it will be seen, but not in clear
It is a period of geological time which extends from 250 to 205.1
million years ago. It marks the begining of the Mesozoic Era.
It is the group of minerals which are compounds of one or more metallic
elements and the tungstate radical (WO4
). They are very
heavy, soft, and brittle. Tungstates are generally categorized with the
chemically related molybdates, where they can be partially replaced by.
They are also known as the wolframates.
It is the tendency of some crystal to intergrow in a distinct specific
form and repeated patterns.