Rock

Sandstone (specifically Arkose or Quartz Arenite)

Arenite (primarily SiO2 with possible Feldspar)

Limestone

Calcium Carbonate (CaCO3)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite

Blue Sapphire

Corundum (Al2O3)

Sandstone

Arenite (primarily SiO2)

Chert (Jasper/Quartzite variety)

Microcrystalline Silica (SiO2)

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Yellow Agate

Silicon Dioxide (SiO2)

Lapis Lazuli

Lazurite-rich metamorphic rock (approx. Na6Ca2(Al6Si6O24)(S,SO4,Cl)1,2)

Smoky Quartz Cluster

Smoky Quartz (Silicon Dioxide - SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Quartz Geode (Cracked Open Fragment)

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Pink Chalcedony (Agate/Jasper blend)

Silicon Dioxide (SiO₂)

Agate (specifically Chalcedony nodule)

Silicon Dioxide (SiO2)

Obsidian

Volcanic glass (high silica volcanic rock)

Sandstone (Quartzose Pebble)

Clastic Sedimentary Rock (Litharenite/Quartz arenite)

Sandstone (likely Quartzose Sandstone)

Arenite (composed primarily of SiO2)

Red Scoria (Lava Rock)

Scoria (Vesicular Basalt)

Conglomerate (River Rock Aggregate)

Conglomerate (Lithic-clast conglomerate)

Diorite (River Rock/Cobble)

Intermediate Plutonic Igneous Rock (Diorite)

Larimar

Pectolite (Sodium Calcium Silicate Hydroxide) - (NaCa2(Si3O8)(OH))

Porphyritic Rhyolite (Red)

Rhyolite (Porphyry)

Granite Cobble

Granite (Felsic Intrusive)

Sandstone

Arenite (SiO2-rich)

Geode Nodules / Chalcedony Geode

Silicon Dioxide (SiO2) - Amorphous to Cryptocrystalline Quartz

Porphyritic Basalt (Chinese Writing Stone)

Porphyritic Basalt with Feldspar Phenocrysts

Granite Pebble

Granite (Phaneritic intrusive igneous rock)

Pink Granite

Granite (Phaneritic Quartz-Feldspar rock)

Granite

Phaneritic Felsic Igneous Rock (Granite)

Basalt

Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Granite (specifically Rapakivi Granite)

Phaneritic Felsic Igneous Rock (Granite)

Riverstone Quartzite

Quartzite (primarily SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Druze on Matrix (Geode Fragment)

Quartz (Silicon Dioxide, SiO2)

Serpentine

Serpentine group, including Antigorite, Lizardite, and Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Granite with Mafic Inclusions

Granite (Phaneritic igneous rock composed of Quartz, Feldspar, and Mica)

Mica Schist

Mica Schist (primarily Muscovite or Biotite KAl2(AlSi3O10)(OH)2)

Granite

Phaneritic Intrusive Igneous Rock (composed of Quartz, Feldspar, and Mica)