Removal of CuI from Cu2P1.8As1.2I2 results in a novel P-As allotrope. Although the product is X-ray amorphous, lattice fringes are observed in the transmission electron micrographs with spacings reflecting the diameter of the linear pnicogen polymer in Cu2P1.8As1.2I2, suggesting the pnicogen chains remain intact upon loss of CuI. The straight needles present in Cu2P1.8As1.2I2 appear to be kinked in the P-As phase due to lattice mismatch between the liberated polymers, ultrasonic treatment, or a combination of these effects. This new P-As modification is semiconducting with a band gap of 1.05 eV.