Rock

Gneiss

Gneiss (Metamorphic Rock)

Basalt (Weathered)

Mafic Igneous Rock

Gneiss (specifically Granitic Gneiss)

Gneissic Metamorphic Rock

Basalt

Mafic Igneous Rock

Conglomerate

Conglomerate (Sedimentary rock)

River Pebble (Siltstone/Mudstone)

Clastic sedimentary rock

Gneiss

Gneiss (Metamorphic rock)

Sandstone (likely Graywacke or Lithic Sandstone)

Clastic Sedimentary Rock

Conglomeratic Sandstone

Clastic Sedimentary Rock

Pumice or Vesicular Basalt/Scoria (water-worn)

Vesicular volcanic rock

Conglomerate (or Breccia)

Clastic Sedimentary Rock

Basalt

Mafic Igneous Rock

Pebble (likely Siltstone or fine-grained Sandstone)

Sedimentary Clastic Rock

Gneiss

Gneissic Metamorphic Rock

Hematite-rich Ironstone

Ferruginous Rock (Fe2O3)

Limestone

Carbonate rock (CaCO3)

Gneiss (with Quartzite layers)

Gneissic Metamorphic Rock

Pyritic Mudstone

Argillaceous rock (FeS2)

Basalt

Mafic Igneous Rock

Slate

Foliated Metamorphic Rock

Sandstone (with Siltstone/Greywacke variations)

Sedimentary Rock (Clastic)

Greenstone Porphyry

Porphyritic Metavolcanic Rock

Vesicular Basalt

Mafic Igneous Rock

Basalt

Mafic Igneous Rock

Basalt

Mafic Volcanic Rock

Pumice or Scoria

Vesicular volcanic rock

Basalt (River Stone)

Mafic volcanic rock

Slate

Foliated Metamorphic Rock

Banded Gneiss

Gneiss (Metamorphic Rock)

Banded Gneiss

Gneiss (Metamorphic Rock)

Shale (possibly Carbonaceous or Oil Shale)

Argillaceous Sedimentary Rock

Granite

Phaneritic Felsic Igneous Rock

Basalt pebble

Basalt (mafic extrusive rock)

Basalt with Quartz Veining

Basalt (Mafic Volcanic Rock)

Basalt (Road Aggregate Specimen)

Aphanitic mafic volcanic rock

Basalt

Extrusive mafic igneous rock

Basalt

Basalt (Mafic volcanic rock)

Basalt

Basalt (Mafic volcanic rock)

Basalt

Mafic Extrusive Igneous Rock

Basalt

Extrusive mafic igneous rock

Granodiorite

Granodiorite (Intermediate plutonic rock)

Conglomerate

Conglomerate (clastic sedimentary rock)