Rock

Red Chert

Microcrystalline Quartz (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (with minor quartz and possible clay components)

Clastic Sedimentary Rock (SiO2 dominated)

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (primarily SiO2)

Limestone

Sedimentary Calcite (CaCO3)

Wishing Stone (Basalt with Quartz Vein)

Basalt containing a microcrystalline quartz (SiO2) or calcite vein

Limestone (specifically Dolomitic/Crystalline Limestone)

Sedimentary Carbonate Rock (CaCO3 / CaMg(CO3)2)

Schist

Mica Schist (Metamorphic Rock)

Granite (with mafic xenolith)

Phaneritic Felsic Plutonic Rock

Granite

Phaneritic plutonic felsic rock

Quartzite Pebble (with Iron Inclusions)

Metamorphic Rock (Mainly SiO2)

Conglomerate

Conglomerate (Clastic Sedimentary Rock)

Rhyolite

Rhyolite (felsic volcanic rock)

Conglomerate

Conglomerate (clastic sedimentary rock)

Granite

Phaneritic Plutonic Rock (Granite)

Diabase (Dolerite)

Mafic Intrusive Igneous Rock

Basalt

Basalt (Igneous Volcanic Rock)

Quartzite

Metamorphic Rock (Mainly SiO2)

Vesicular Basalt or Scoria

Basalt (extrusive volcanic rock)

Pink Quartzite

Silica (SiO2) - Metamorphic rock

Limestone (Weathered Aggregate)

Sedimentary Carbonate Rock (CaCO3)

Granite

Granite (Felsic Plutonic Rock)

Gneiss (specifically a weathered or stream-worn specimen)

Gneiss (Foliated Metamorphic Rock)

Basalt

Basalt (Mafic volcanic rock)

Granite

Granite (Felsic Plutonic Rock)

Granite

Phaneritic Felsic Igneous Rock

Diorite

Phaneritic Intermediate Igneous Rock

Basalt

Basalt (Mafic volcanic rock)

Granite

Phaneritic Felsic Igneous Rock

Basalt

Basalt (Mafic volcanic rock)

Red Granite

Felsic Intrusive Igneous Rock

Travertine

Terrestrial Sedimentary Rock (CaCO3)

Granite (Pegmatitic)

Phaneritic Felsic Igneous Rock

Granite

Granite (Felsic Plutonic Rock)

Granite

Intrusive Felsic Igneous Rock

Andesite Porphyry

Andesite (Intermediate Volcanic Rock)

Granite

Phaneritic Felsic Igneous Rock

Granite

Phaneritic Felsic Igneous Rock

Granite

Granite (Phaneritic Igneous Rock)

Conglomerate

Conglomerate (clastic sedimentary rock)

Quartzite pebble

Metamorphic rock (mainly SiO2)

Granite

Phaneritic Igneous Rock (Granite)