Crystal structure: Orthorhombic

In the orthorhombic lattice system (ORTH), lattice axes lie in the direction of the 3 perpendicular symmetry axes.

15P
Phosphoruswhite, red and violet are waxy, black is metallic-looking
16S
Sulfuryellow sintered microcrystals
17Cl
Chlorinepale yellow-green gas
31Ga
Galliumsilvery blue
35Br
Brominereddish-brown
53I
Iodinelustrous metallic gray (solid); black/violet (liquid); violet (gas)
92U
Uraniumsilvery gray metallic; corrodes to a spalling black oxide coat in air
93Np
Neptuniumsilvery metallic