Phosphor Arsenic alloy is a semiconductor. We have different types of P-As alloys available containing a different ratio P/As. For low amounts of As the crystal can still be cleaved as a 2D crystal and the unit cell parameters are similar to black phosphorus (click here). The layers are stacked together via van der Waals interactions and can be exfoliated into thin 2D layers.
The P-As crystals produced at HQ Graphene have a typical lateral size of ~0.1 cm and have a metallic appearance.