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Lustre (British English) or luster (American English; see spelling differences) is the way light interacts with the surface of a crystal, rock, or mineral. The word traces its origins back to the Latin lux , meaning "light", and generally implies radiance, gloss, or brilliance.
Christite has an adamantine luster and leaves behind an orange streak. [3] Its crystal system is monoclinic with possible crystal classes of twofold symmetry, mirror plane symmetry, and twofold with a mirror plane. This means it can have radial symmetry, mirror plane symmetry, or mirror plane symmetry perpendicular to the two-fold axis. [5]
Adamantine may refer to: Adamant or adamantine, a generic name for a very hard material; Adamantine (veneer), a patented celluloid veneer; Adamantine lustre, a ...
Transparent zircon is a well-known form of semi-precious gemstone, favored for its high specific gravity (between 4.2 and 4.86) and adamantine luster. Because of its high refractive index (1.92) it has sometimes been used as a substitute for diamond, though it does not display quite the same play of color as a diamond.
In some instances, knowledge about the anatomy of animals' digestive tracts can be helpful in assigning a coprolite to the animal that produced it, one example being the finding that the Triassic dinosauriform Silesaurus may have been an insectivore, a suggestion which was based on the beak-like jaws of the animal and the high density of beetle ...
Iridescence is also found in plants, animals and many other items. The range of colours of natural iridescent objects can be narrow, for example shifting between two or three colours as the viewing angle changes, [5] [6] An iridescent biofilm on the surface of a fish tank diffracts the reflected light, displaying the entire spectrum of colours ...
Cuprite is an oxide mineral composed of copper(I) oxide Cu 2 O, and is a minor ore of copper. [5]Cuprite from Tsumeb Mine (size:2.3 x 2.1 x 1.2 cm. Its dark crystals with red internal reflections are in the isometric system hexoctahedral class, appearing as cubic, octahedral, or dodecahedral forms, or in combinations.
A beetle leg. An appendage (or outgrowth) is an external body part or natural prolongation that protrudes from an organism's body such as an arm or a leg. Protrusions from single-celled bacteria and archaea are known as cell-surface appendages or surface appendages.