The Tree
The trees vary in height from 15m in Zaire, to 30m or more elsewhere, with a diameter 1.0m or slightly more above the large buttresses. G. cedrata is usually the larger tree.

The Timber
G. thompsonii - Pinkish-brown, like a pale mahogany, darkening to a better colour than G. cediata. Straight grain and a silky appearance. Weight about 640 kg/m3 when dried. G. cediata - Pinkish-brown, with a fine texture, and cedar-like scent. Weight about 590 kg/m3 when dried.

Drying
There is little difficulty in air drying; G. cedrata is generally less liable to split and warp. Kiln drying requires care in order to avoid exudation of a clear resin from the wood.

Working Qualities
Medium - G. thompsonii - Works fairly easily with both hand and machine tools with only a slight dulling effect on cutting edges. Less woolly than G. cedrata, it compares favourably with the denser grades of American mahogany. When interlocked grain is present there is a tendency to pick up in planing and moulding operations and a reduced cutting angle of 200 is recommended. It finishes cleanly and takes a high polish, and also takes nails, screws and glue without trouble. G. cedrata - Works fairly easily but is inclined to be a little more woolly than G. thompsonii and tends to dull cutting edges more readily. Cutting angles should be reduced for planing and moulding. Care is required in polishing as resin may be exuded especially in warm atmospheres.