An amethystine chalcedony, Damsonite occurs in a variety of patterns and colors. Found only at a single undisclosed locality in central Arizona, Damsonite occurs in veins and massive blocks up to 1 meter thick and is enclosed in weathered sedimentary host rock.

The purple Damsonite is a tough microcrystalline aggregate with a wax-like appearance that takes on a glass-like luster when polished. About half the material within the deposit is a darker purple, with the rest occurring in lighter shades. Some of the Damsonite is veined by thin seams of reddish-brown, which may be either an iron oxidation product such as hematite or goethite, or an iron-stained type of chalcedony such as jasper. The chalcedony does not tend to fracture along these veins or along other color boundaries.

Damsonite is easily identified by standard gemological testing procedures. Its gemological properties are generally found to correspond closely to those of both chalcedony and amethyst.