Not A Rock Or Mineral

Quartz / Common Agate

Silicon Dioxide (SiO2)

Basalt

Basalt (extrusive igneous rock)

Vesicular Basalt with Amygdaloidal Infill

Basalt (Mafic Extrusive Igneous Rock)

Geode (Unopened)

Silicon Dioxide (SiO2) in sedimentary vugs

Pyrite on Quartz matrix

Iron Disulfide (FeS2) on Silicon Dioxide (SiO2)

Chert / Flint

Cryptocrystalline quartz (SiO2)

Milky Quartz Pebble (Iron-Stained)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2 with various cementing agents)

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (SiO2 + Fe2O3)

Basalt with Quartz/Feldspar Inclusions

Amygdaloidal or Porphyritic Mafic Volcanic Rock with Siliceous Veining

Amygdaloidal Basalt with Agate/Chalcedony Infills

Amygdaloidal Basalt (Composition: SiO2 and (Mg,Fe)2SiO4 in matrix; SiO2 in amygdule)

Limestone Breccia

Sedimentary Breccia (Calcareous)

Granite

Granite (composed mainly of Quartz, Feldspar, and Mica)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Sandstone (likely Ferruginous)

Sandstone (SiO2 with iron oxides)

Turquoise

Turquoise (CuAl6(PO4)4(OH)8·4H2O)

Dalmatian Stone

Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)

Sandstone (Ferruginous)

Arenite with Iron Oxides

Milky Quartz with Mineral Inclusions

Quartz (Silicon Dioxide, SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Sandstone

Arenite (Siliclastic sedimentary rock), SiO2 + various minerals

Diorite (River Cobble)

Intermediate plutonic igneous rock

Quartz Pebble (Water-worn Quartzite)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Agatized Petrified Wood

Silicon Dioxide (SiO2) - Chalcedony pseudomorph after Wood

Garnetiferous Pegmatite

Pegmatite with Almandine Garnet and Muscovite

Quartz Vein in Host Rock (Gabbro or Basalt)

Silicon Dioxide (SiO2) with Mafic Silicates

Shale

Shale (Sedimentary rock composed of mud/clay minerals)

Copper Ore (with Malachite and Azurite)

Hydroxide copper carbonate (Cu2CO3(OH)2 / Cu3(CO3)2(OH)2)

Sandstone (Quartzite Pebble)

Arenite (primarily SiO2)

Dalmatian Stone

Peralkaline Feldsphathic Igneous Rock

Turquoise in Matrix

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

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Dalmatian Stone

Peralkaline rhyolite

Blue Dyed Agate Geode

Chalcedony (cryptocrystalline Quartz), SiO2

Granite Glacial Erratic

Intrusive Phaneritic Felsic Rock (Granite)

Sandstone

Arenite (primarily SiO2)

Ironstone Concretion (Nutstone)

Ironstone (with High Limonite/Hematite Content)