submetallic


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Related to submetallic: quartz

submetallic

[¦səb·mə′tal·ik]
(optics)
Referring to a luster intermediate between metallic and nonmetallic, such as exhibited by the mineral chromite.
References in periodicals archive ?
It occurs as velvety black, submetallic plates, up to 1 mm in diameter; as black hexagonal plates and rosettes; as dull black, granular patches; and as a dull black, thin coating on small rosettes of brookite.
Pseudorutile was reported to occur as black, submetallic, granular patches associated with "K-feldspar," brookite and dawsonite (Sabina, 1979).
Rutile has been identified in at least one specimen (from a sill cavity) as black, submetallic plates associated with dawsonite, calcite and quartz (GSC APS 709).
Some pyrite grains in silicified serpentinite matrix were observed to be rimmed or replaced by a black submetallic mineral.
In the oxidation zone it is found in cavities in the spongy siderite ore, as opaque, black, hexagonal, tabular or short prismatic crystals 1-3 mm across, with bluish iridescence and a submetallic luster; as a crust consisting of masses of thin, bluish lamellae, 0.
In some of these sulfide crusts, where tetrahedrite predominates, famatinite is found very rarely as dull black, submetallic layers and veinlets up to 0.
Broken surfaces exhibit a marked radial structure, steel-gray color and submetallic luster.
A very rare species in a siderite zone of the Vilmos section, polybasite was found as submetallic, black, hexagonal tabular crystals up to 0.
Anglesite is typically found as a massive silvery-black submetallic massive material in small seams and pockets throughout the vein.
The lustre is resinous to submetallic, and masses are opaque whereas thin edges of grains are translucent.
The hematite crystals are mostly loose, horizontally striated hexagonal prisms with wavy faces (think corundum), black, with a medium-bright submetallic luster, all from 1.