ID	Sample name	producing area	Density (g/cm³)	specific surface area (m²/g)	Hole Diameter &distribution μm)
ID	Sample name	producing area	Density (g/cm³)	specific surface area (m²/g)	large	Middle	small
1	craignurite	USA	0.91	8.47	234~110	37~10.5	3.05~1.10
2	rhyoandesite	Thera Qarry	0.81	0.79	173~60	28.1~7.8	4.9~3.02
3	trachyte	Italy	0.62	8.04	202~64	27.9~6.6	4.17~1.45
4	rhyolite	Nicaragua	1.03	0.54	202~71	28.8~6.3	3.98~1.80
5	rhyolite	Japan	0.69	5.57	245~119	34.7~10.2	2.91~1.17
6^*	rhyolite	China (Changbai Mountain)	0.78	0.245		9.25~17.2