Quick Answer: The Group of Volcanic Rocks is a set of natural extrusive igneous rock specimens, each about 3 cm x 4 cm, held in a partitioned tray with an identification key. A petrological description chart in English comes with the set.
Last updated: October 2026
Key Features
Representative extrusive igneous (volcanic) rock specimens
Natural specimens, average 3 cm x 4 cm hand-sample size
Partitioned specimen tray with identification key
Technical index and petrological description chart in English
Technical Specifications
Specification
Value
Specimens
Extrusive igneous (volcanic) rocks, natural
Average size
3 cm x 4 cm
Storage
Partitioned tray with identification key
Documentation
Technical index and petrological description chart, English
About This Product
Volcanic rocks form when lava cools at or near the surface, and their textures record how fast that happened. With this set students examine fine-grained textures, gas vesicles and pyroclastic fragments, and link each feature to cooling rate and eruption style.
Frequently Asked Questions
What comes with the Group of Volcanic Rocks?
The specimens sit in a partitioned tray with an identification key, and a technical index and petrological description chart in English are included.