The fresh surface of neptunium is silvery.
Neptunium has a metallic appearance.
dull
dull luster looks somewhat metallic, but it isn't quite as reflective.
the luster is dull or some metallic.
it is dull
it is dull
Granite has a very dull luster when unpolished.
dull to pearly to subvitreous
Dull Luster, because Xenon is colorless it cannot have shinny luster.
In geology, dull luster means little to no luster is exhibited by a mineral. This is due to coarse granulations which scatter the light in all directions.
The words waxy, pearly, and dull describe a mineral's luster.
the type of luster which is dull