Mineral Based Composite

Sandstone

Arenite (SiO2 based)

Sandstone (Quartzose Sandstone)

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone (likely Red/Brown Sandstone)

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Tiger Iron

Composite rock (Quartz, Tiger's Eye, Hematite, and Jasper)

N/A (Non-Geological Object)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone (Quartz-rich)

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Polished banded calcite sphere (often sold as onyx marble)

Calcite, CaCO₃; likely banded calcite marketed as “onyx”

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone (Quartzose)

Arenite (SiO2 based)

Sandstone

Sandstone (clastic sedimentary rock composite)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Likely slate fragment

Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz

Schist

Schist

Feldspar-Quartz Rock (likely Pegmatite or Granite)

Feldspar-Quartz composite rock (KAlSi3O8 - SiO2)

Jasper and Chalcedony Composite

Silicon Dioxide (SiO2) microcrystalline quartz

Sandstone River Pebble

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone with Quarzite clasts

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone (Quartzose)

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Quartz / Common Opal Transition

Silicon Dioxide (SiO2)

Not a geological specimen

N/A (man-made object)