Antropogenic Rock (Man Made)

Conglomerate

Conglomerate (clastic sedimentary rock)

Sandstone (likely Arkose or Quartz Sandstone)

Clastic sedimentary rock (primarily SiO2)

Chert (Gravel Bit)

Microcrystalline silica (SiO2)

Banded Agate

Chalcedony / Silicon Dioxide (SiO2)

Sandstone (with minor quartz and possible clay components)

Clastic Sedimentary Rock (SiO2 dominated)

Granite

Granite (Mainly Quartz, Feldspar, and Mica)

Gossan with Copper Carbonate (Chrysocolla/Malachite)

Ferruginous Oxide (Gossan) with Cu2CO3(OH)2 (Malachite) or (Cu,Al)2H2Si2O5(OH)4 (Chrysocolla)

Granite River Pebble

Phaneritic Felsic Igneous Rock (Granite)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Epidote

Epidote Group (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Blue Howlite (Dyed)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Jasper Breccia

Silicon Dioxide (SiO2) with impurities

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Quartz (Milky or Cloudy variety)

Silicon Dioxide (SiO2)

Picture Jasper

Silicon Dioxide (SiO2)

River Pebbles (Stream-rounded rocks)

Fluvial Detritus (varied mineralogy)

Chert (Chert Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Coquina Jasper

Fossiliferous Chalcedony (SiO2)

Labradorite (Larvikite variety)

Plagioclase Feldspar (Na,Ca)(Al,Si)4O8 with Monzonite/Syenite matrix

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Ironstone Concretion

Limonitic/Hematitic Concretion

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Dyed Agate

Chalcedony (Silicon Dioxide, SiO2)

Bumblebee Jasper

Volcanic Tuff (mixture of Quartz, Sulfur, Hematite, and Orpiment)

Sand Dollar Fossil

Echinoidea (Clypeasteroida)

Coral Fossil (Favosites type)

Phylum Cnidaria, Class Anthozoa (often CaCO3 - Calcium Carbonate)

Quartz with Limonite Staining

Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)

Garnet in Matrix (Eclogite)

Eclogite, featuring Almandine or Pyrope Garnet [X3Y2(SiO4)3]

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock including secondary mineral infills)

Amethyst (Agate/Chalcedony variety)

Silicon Dioxide (SiO2) with iron impurities

Sandstone Concretion

Clastic Sedimentary Concretion (primarily SiO2 with Fe2O3 cement)

Unakite

Epidotized Granite

Chert (specifically Jasper)

Silicon dioxide (SiO2) with iron oxide inclusions

Green Banded Agate

Agate (Variety of Chalcedony/Quartz), SiO2

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Green Chalcedony (likely Green Agate or Chrysoprase)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Gneiss (High-grade Metamorphic Rock)

Gneiss (Metamorphic silicate rock)

Pumice (likely)

Pumice (extrusive igneous rock)