Not A Rock

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Eclogite (retrograded)

Eclogite (Omphacite-Garnet rock)

Chondrite Meteorite

Ordinary Chondrite (L or H Group)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Granite Cobble

Granite (Felsic intrusive igneous rock)

Limestone

Limestone (Calcium Carbonate: CaCO3)

Olivine Peridotite

Peridotite (comprising Olivine (Mg,Fe)2SiO4 and Pyroxene)

Sandstone (likely Arkosic)

Arenite (SiO2 with KAlSi3O8)

Granite

Intrusive igneous felsic rock

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (composed primarily of SiO2)

Limestone (Weathered)

Calcium Carbonate (CaCO3)

Honeycomb Coral Fossil

Favosites (extinct genus of tabulate coral)

Pink Granite

Granite (Felsic Plutonic Rock)

Granite

Phaneritic Igneous Rock (Granite)

Conglomerate

Conglomerate (clastic sedimentary rock)

Scoria (Lava Rock)

Scoria (extrusive volcanic rock)

Granite

Granite (Felsic Plutonic Rock)

Granite

Granite (Felsic Plutonic Rock)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Scoria (Lava Rock)

Scoria (Extrusive Igneous Rock)

Lava Rock (Scoria)

Scoria (Basaltic Scoria)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Basalt Pebble

Basalt

Unakite

Epidotized Granite

Sandstone with Iron Staining

Arenite (SiO2 with Fe-oxide impurities)

Unakite

Unakite (Epidotized Granite)

Unakite

Epidotized Granite

Unakite

Epidotized Granite

Unakite

Unakite (Epidotized Granite)

Unakite

Epidotized Granite

Quartzite Pebble

Quartzite (mostly SiO2)

Basalt

Basalt

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Unakite

Unakite (Epidotized Granite)

Serpentinite

Serpentinite (complex silicate minerals including Mg3Si2O5(OH)4)

Basalt

Basalt (containing Pyroxene, Plagioclase feldspar, and Olivine)

Unakite

Unakite (Epidotized Granite)

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4