Rock

Green Quartz (Prasiolite / Chlorite-Included Quartz Pebble)

Silicon Dioxide (SiO2) with micro-inclusions

Granite Pebble

Granite

Diorite (or Gabbro/Gneiss stream pebble)

Diorite

Quartz (Milky / Clear Quartz Fragment)

Silicon Dioxide (SiO2)

Red Sandstone (River Cobble)

Quartz Arenite / Ferruginous Sandstone

Banded Chert Pebble

Silicon Dioxide (SiO2)

Beach Pebble / Agate-bearing Chert Pebble

Microcrystalline Quartz (SiO2) with Inclusion Minerals

River Pebble (Quartzite / Sandstone)

SiO2 (Quartz-rich sedimentary/metamorphic rock)

Beach Pebble Quartzite / Chalcedony Pebble

Silicon Dioxide (SiO2)

Porphyritic Basalt (or Porfido / Porphyry Beach Pebble)

Porphyritic Basalt / Andesite

Greenstone / Greywacke

Metagraywacke (contains Chlorite and Epidote)

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

Gneiss

Gneiss

Scoria

Scoria (vesicular basalt-andesite)

Amygdaloidal Basalt with Quartz

Basalt with Secondary Mineral Infilling

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite Pebble

Quartzite (mostly SiO2)

Sandstone (lithic wake or graywacke)

Clastic sedimentary rock (primarily quartz and lithic fragments)

Jasper River Stone

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Snowflake Obsidian

Volcanic Glass with Spherulite Inclusions (primarily SiO2)

Greenstone with Magnetite Veins

Metabasalt (Greenstone)

Gray River Pebble (likely Limestone or Siltstone)

Sedimentary Rock (Calcium Carbonate or Siliciclastic)

Blue Quartzite (Dyed)

Metamorphosed Quartz-rich Sandstone (SiO2 with organic dye)

Basalt Scoria

Aphanitic basaltic scoria

Jasper

Silicon dioxide (SiO2) with impurities

Conglomerate

Conglomeratic Sandstone / Sedimentary Breccia

Tiger's Eye (Brown/Dark variety)

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)

Rose Quartz

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

Milky Quartz with inclusions

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite with Iron Oxide staining (Fe2O3)

Kambaba Jasper

Stromatolite / Fossilized Algae (Rhyolitic structure)

Ironstone Concretion (Nutstone)

Ironstone (with High Limonite/Hematite Content)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Yellow Quartzite or Yellow Jasper

Quartzite (primarily SiO2 with Iron oxide staining)

Sandstone (likely Quartzose)

Sandstone (Principally SiO2)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Dyed Agate Geode (Pink/Magenta)

Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz

Milky Quartz with Chlorite/Mica inclusions

Silicon Dioxide (SiO2) with inclusions

Sandstone (Ferruginous)

Arenite (Fe2O3 stained)

Tree Agate

Dendritic Agate (Silicon Dioxide, SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)