Rock

Basalt

Basalt

Vesicular Basalt

Basalt

River Basalt (Cobble)

Mafic Igneous Rock (Fine-grained Basalt)

Vesicular Basalt

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Basalt River Cobble

Extrusive Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Clear Quartz

Silicon Dioxide (SiO2)

Lunar Meteorite (Feldspathic Breccia)

Lunar Feldspathic Breccia

Epidote and Quartz in Basalt Porpohyry

Epidote bearing Porphyritic Basalt with Quartz Veins

Garnet-bearing Schist

Almandine Garnet [Fe3Al2(SiO4)3] in Micaceous Schist

Sandstone

Arenite (SiO2 based with primary clasts 0.0625 to 2 mm)

Chert (Common Opal/Jasper variety)

Microcrystalline Quartz (SiO2)

Scoria

Scoria (Vesicular Basalt)

Sandstone (Greywacke/Siltstone variant)

Arenite / Wacke (SiO2 with diverse mineral inclusions)

Sandstone

Quartz Arenite / Clastic Sedimentary Rock

Sandstone

Arenite (SiO2 based clastic rock)

Pumice

Pumice (a highly vesicular volcanic rock)

Sandstone (with potential fossil inclusions)

Clastic sedimentary rock (primarily SiO2)

Granite

Granite (Phaneritic Quartz-Feldspar rock)

Sandstone (Fossiliferous)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Amygdaloidal Basalt

Amygdaloidal Mafic Volcanic Rock

Pink Granite

Granite (Felsic Plutonic Rock)

Quartz with Mica and Feldspar

Granitic Pegmatite Fragment (SiO2 + KAlSi3O8 + KAl2(AlSi3O10)(OH)2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Sandstone

Sedimentary Rock (Quartz Arenite)

Shale

Shale (clastic sedimentary rock)

River Pebble (Basalt or Graywacke)

Mafic Igneous Rock (Basalt)

Conglomerate

Clastic sedimentary rock (Conglomerate)

Pink Granite

Phaneritic Plutonic Felsic Igneous Rock (Granite)

Sandstone

Arenite (composed mainly of SiO2)

Fossil Coral (Honeycomb Coral)

Favosites (extinct genus of Tabulate coral)

Red Sandstone (Iron-rich)

Arenite (with Hematite cement)

Quartz Geode (partially formed/chalcedony with iron staining)

Quartz (SiO2) with Chalcedony (cryptocrystalline quartz) and likely Iron Oxides/Hydroxides

Shale or Mudstone (Based on appearance)

Shale (fine-grained, laminated fissile sedimentary rock) / Mudstone (fine-grained, non-fissile sedimentary rock)

Mica Schist

Mica Schist (predominantly Muscovite or Biotite series)

Basalt with Granite Inclusions (Xenolith)

Mafic Igneous Rock (Basalt) with Felsic Igneous Inclusion (Granite)

Petoskey Stone (Fossilized Coral)

Hexagonaria percarinata

Dragon Blood Jasper

Epidote with Pietersite or Red Jasper (Ca2Al2Fe3+[Si2O7][SiO4]O(OH))

Sandstone

Arenite (composed primarily of SiO2)

Obsidian

Volcanic Glass

Unakite

Altered Granite

Chert (Yellow Jasper / Flint)

Microcrystalline Quartz (SiO2)