A class set of 12 large rock specimens supplied in a Gratnell's tray, with lid. Includes granite (Cornwall), basalt (Antrim), andesite (Somerset), gabbro (Wales), sandstone (Shropshire), limestone (Gloucestershire), chalk (Hampshire), bubble basalt (Iceland), Oxford Clay (Oxfordshire), marble , schist (Iona), slate (Wales).

Each specimen is approximately 50 x 50 x 50mm. Laminated flow chart and Teaching notes included.