Figure – Any distinctive appearance on a longitudinal wood surface resulting from anatomical structure, irregular coloration or defects.
Gum Pocket – An excessive local accumulation of resin or gum in the wood.
Heartwood – The wood from the pith extending to the sapwood, darker in color due to gum, resins and other materials which make it less susceptible to rot.
Mineral Streaking – Mineral deposits formed in the wood as the tree extracts nutrients from the soil. These deposits cause blackish-blue streaks in the grain.
Pitch Pocket – A typically lens-shaped space, containing liquid or solid resin that extends parallel to the annual growth ring in certain coniferous woods.
Pith – The soft core in the center of a log.
Sapwood – The lighter colored wood on the outside of a log, this wood is more susceptible to rot than the heartwood.