Genus Quercus. Oak is known for its distinctive grain pattern, which can be straight or have pronounced waves or curly figures. The color of the wood can range from light brown to a reddish brown hue with occasional mineral streaks. Oak is a hardwood with a high density of 769 kg/m3, and durability, making it a popular choice for furniture. Invest in the beauty and durability of natural wood with our exquisite slab supply.