Some nitridoborates are salt-like such as Li 3 BN 2, LiCa 4 [ BN 2 ] 3 others have a metallic lustre, such as LiEu 4 [ BN 2 ] 3.
22.
The metallic lustre of the feathers of many birds, such as the humming birds, is due to the presence of excessively fine striae upon the surface of the feathers . ""
23.
They also have a distinct metallic lustre, which is the reason behind their genus name, which derives from Greek, " chalko-", and is the combining form of " chalk�s ", meaning copper.
24.
There is a fine oblique dark brown line beyond this from the costa to the termen on the upper third and a small blackish spot, mixed with bronzy-metallic lustre, the on termen at the base of the tornal prominence.
25.
The forewings are purple fuscous, with a violet metallic lustre and a whitish blotch on the inner margin from one-fifth to three-fifths, not quite reaching the costa, as well as a narrow whitish fascia from the costa at two-thirds, two before the anal angle, constricted in the disc.
