大凡可以制砚的石材,如端石、歙石、洮河石、红丝石、松花石、贺兰石等等,都有自然的花纹,也称石品。这些石品花纹,是某些矿物质成分,在亿万年的地层变动中,局部聚集而成,呈现出赤橙黄绿青蓝紫等多种颜色,丝、线、带、斑、点、块等多种形状,千姿百态,绚丽多彩;天工灵秀,自然之美,“迥非笔墨能尽其名状”。如端石上的蕉叶白、胭脂晕、火捺、青 Stone can be made of stone, such as Duan Shi, Shi Shi, Shihe stone, red silk stone, Songhua Shi, Helan stone, etc., have a natural pattern, also known as stone products. These stone pattern, is a certain mineral composition, in hundreds of millions of years of formation changes, gathered together, showing a variety of red, yellow, green, blue and purple, silk, thread, tape, spot, spot, And so on a variety of shapes, mix and match, colorful; 天工 灵秀, the beauty of nature, “Jiong non-pen can do its best name ”. Such as Duan Shi banana leaf white, rouge halo, Na Na, blue