Nachiguro stone is a natural stone produced in the Kumano Region and is used for producing Ink stone and Goishi. In the production of Ink stone and Goishi, a large amount of powder appears as a byproduct. To date, the Nachiguro stone powder is only used in the production of resin products. In the present study, Nachiguro powder sintering process method can manufacture black sintered compact. But, the formed bodies sometimes crack by the dry process before the sintering. In this paper, we report about the relation between crack and powder particle size,shape of formed bodies.