At the 2017 ESCONI Juniors booth, there were several types of rock collections that young collectors could make for free. (Only a few collections were available at any time.)
Collectors could take the rocks and a card home in a plastic bag. Scroll down this page for photos of completed cars and more information about the rocks
ROCKS FROM VOLCANOES: Pumice and Scoria are lava rocks that have lots of bubble holes. Apache Tears are solid lumps of Obsidian (volcanic glass).
ROCKS BY COLOR: This collection card has rocks can be identified, in part, by their color:
THREE TYPES OF ROCKS This collection card includes two examples for each of the three major classes of rock, igneous, sedimentary, and metamorphic: