Glossary Category: Rock Types

Collector-focused definitions used on labels, listings, and educational pages—kept practical and easy to scan.

A rock made of rounded gravel clasts cemented together; conglomerates record high-energy transport and mixed sources.
Evaporite minerals form when salty water evaporates and leaves minerals behind, commonly producing collectible crystals like halite (rock salt) and gypsum.
Rock formed from cooled magma or lava; texture and minerals help collectors identify source and related mineralization.
Rock altered by heat and pressure; metamorphic textures like foliation can host collectible minerals and control breakage.
Rock made from deposited sediment; sedimentary rocks preserve bedding, environments, and most fossils.