Figure 2
From: Natural arsenic with a unique order structure: potential for new quantum materials
SEM image of crystal aggregate of Pnm21-aresenic and the relationship between crystal morphology and lattice axis. Comparison of crystal morphology with unit lattice and atomic arrangement. Pnm21-arsenic crystals form as bladed crystals, which show parallel growth along the b-axis. Poor growth in the direction perpendicular to the c-axis results in a thin plate shape. Because periodicity is short in the b-axis direction, Pnm21-arsenic crystals tends to elongate in this direction, and the crystals assume a bladed shape.
