Massive Basalt Low viscosity degassed basaltic flow Size: 12 cm Aa-Lava Low viscosity lava flow with rough and fragmented surfaces Size: 12 cm Aa-Lava - is more viscous than Pahoehoe lava Hawaii, USA Size: 10 cm Pahoehoe Lava Low-viscosity lava flow with smooth and ropy surfaces Size: 13 cm Pahoehoe Lava – is less viscous than Aa lava Zhejiang, China Size: 20 cm Rhyolite Highly viscous degassed lava with flow banding Size: 15 cm Volcanic Breccia - formed by autobrecciation Sai Kung, Hong Kong Size: 16 cm Volcanic Breccia - Usually found in thick nearly solidified lava flows Sarawak, Malaysia Size: 12 cm