Physical properties are the property of a rock after being tasted without damaging the rock. This research aims to describe the physical properties of rocks in Blawan-Ijen, including rock texture, rock density and rock porosity. The method of collecting data is carried out directly, namely conducting direct research in the field and indirect research by conducting library research. The physical properties of the rocks in Blawan-Ijen have a smooth and rough texture, holocrystalline, light and dark colors, and compact. The density value is relatively high, so it has a fairly high density and resistance. In contrast, the porosity value of the rocks in Blawan-Ijen has three categories: poor porosity, very poor porosity, and high porosity. The texture of the rocks in Blawan-Ijen is smooth, holocrystalline, has small cavities and dark in color.

Ijen Complex is the area that became part of Mount Ijen. In morphology, Ijen complex has Kendeng caldera the diameter of 14-16 km in the North whereas in the southern part of forming a row of mountains. The northern part of Mount Ijen as Blawan–Ijen is the area has the potential of geothermal. Blawan-Ijen becomes the gathering place for the volcanic materials since this region is a region which has low topography. Volcanic materials collected form a rock after experiencing cooling and in a long time. This research was conducted to identify the rocks in the area of Blawan–Ijen. The process starts with a sampling of rocks. Then the rocks are identified based on the structure of the manifest and differentiated according to the origin. Based on the identification process can be known that at Blawan-Ijen, found some sort of rock like a rock breksi, lava stones, silt stones, basalt stones, pumice stone and limestone. So it can be inferred that in Blawan-Ijen there are two types of rocks that is igneous and sedimentary rocks.