Not A Rock (Man Made Polymer)

Fossilized Favosites (Honeycomb Coral)

Favosites (extinct genus of tabulate coral)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Granite

Phaneritic Felsic Igneous Rock

Quartz-veined Siltstone/Greywacke

Clastic Sedimentary Rock with Quartz Infill (SiO2 vein)

Quartz (Milky/Granular)

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with trace Titanium or Manganese

Quartz

Silicon Dioxide (SiO2)

Quartz Geode (with possible Manganese or Goethite coating)

Silicon Dioxide (SiO2)

Agate (Crazy Lace or Eye Agate)

Silicon Dioxide (SiO2)

Fossilized Coral

Cnidaria (Anthozoa), often replaced by Calcium Carbonate (CaCO3) or Silica (SiO2)

Ironstone Concretion

Siderite or Ferruginous Concretion (FeCO3 or Iron Oxides)

Fossil Shell in Sedimentary Matrix

Bivalvia (fossil) in Calcium Carbonate Matrix

Red Sandstone

Arenite (Ferruginous Sandstone)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Quartz Vein in Host Rock (Gabbro or Basalt)

Silicon Dioxide (SiO2) with Mafic Silicates

Basalt

Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)

Sandstone (likely Arkose or Quartz Sandstone)

Arenite (SiO2 + varied clasts)

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Granite (with Quartz and Mica)

Phaneritic Felsic Igneous Rock

Sandstone

Arenite (primarily SiO2)

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Amygdaloidal Basalt

Basalt with Secondary Mineral Infillings

Basalt

Basalt (Mafic Extrusive Rock)

Limestone with Calcite Veins

Calcium Carbonate (CaCO3)

Sandstone (Greywacke/Lithic Sandstone)

Arenite / Lithic Sandstone

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Scoria (Lava Rock)

Scoria

Sandstone (River Cobble)

Clastic sedimentary rock (primarily SiO2 with various lithic fragments)

Quartz-Veined Mudstone

Argillaceous Mudstone with Quartz Veining

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Rose Quartz

Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Tiger's Eye (Brown/Dark variety)

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)

Kambaba Jasper

Stromatolite / Fossilized Algae (Rhyolitic structure)

Ironstone Concretion (Nutstone)

Ironstone (with High Limonite/Hematite Content)

Conglomerate

Conglomeratic Sandstone / Sedimentary Breccia

Dyed Agate Geode (Pink/Magenta)

Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Dendritic Jasper

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

Yellow Quartzite or Yellow Jasper

Quartzite (primarily SiO2 with Iron oxide staining)