Sedimentary (Secondary Mineral Formation)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Basalt with Vesicular Surface

Basalt (Mafic Extrusive)

Quartzite River Rock

Quartzite (primarily SiO2)

Pink Dyed Agate

Silicon Dioxide (SiO2) - Variety Agate

Blue Sapphire

Corundum (Al2O3 with trace amounts of iron and titanium)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Chert (Red Jasper variety)

Silicon Dioxide (SiO2)

Calcite (likely a tumbled specimen)

Calcite (CaCO 3 )

Quartz Geode (likely within Limestone or Dolomite matrix)

Quartz (SiO₂)

Cinnabar

Cinnabar (HgS)

Quartz (Rock Crystal)

Quartz (SiO₂ - Silicon Dioxide)

Pink Granite

Granite (Phaneritic intrusive igneous rock)

Quartz Druzy on Matrix (with Copper Mineralization)

Silicon Dioxide (SiO2) with Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O)

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

Quartz Pebble

Silicon Dioxide (SiO2)

Gold Nugget

Native Gold (Au)

Quartz with Iron Staining

Silicon Dioxide (SiO2)

Ruby

Corundum (Al2O3 with Chromium traces)

Sandstone Beach Pebble

Clastic Sandstone (SiO2 - Quartz-dominant)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Sandstone Pebble (Quartzite-rich)

Clastic Terrigenous Sedimentary Rock (SiO2 dominant)

Chrysocolla in Quartz (Gem Silica)

Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) / SiO2 (Quartz)

Milky Quartz

Silicon Dioxide (SiO2)

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Vesicular Basalt (Scoria)

Basalt (Extrusive Igneous Rock)

Sandstone

Arenite (primarily SiO2)

Prase Quartz on Feldspar

Quartz (Silicon Dioxide, SiO2) with Hedenbergite inclusions on Potassium Feldspar (KAlSi3O8)

Geode (Unopened)

Silica Concretion / Geode (Formula: SiO2 for quartz internal contents)

Green Aventurine

Silicon Dioxide with Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Carnelian

Chalcedony (SiO2) with Iron Oxide impurities

Banded Iron Formation (BIF)

Banded Iron Formation (composed primarily of Hematite [Fe2O3], Magnetite [Fe3O4], and Chert [SiO2])

Basalt

Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)

Basalt with Epidote Veins

Mafic Igneous Rock (Basalt)

Fluorite (often referred to casually as 'Fluorspar' in industrial contexts)

Fluorite (CaF2)

Amygdaloidal Basalt with Quartz/Calcite Inclusions

Amygdaloidal Basalt (SiO2 / CaCO3 inclusions)

Granite

Phaneritic plutonic rock (Felsic)

Banded Chert (River Pebble)

Microcrystalline Quartz (SiO2)

Pearl

Aragonite (CaCO3 with conchiolin)

Fuchsite

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Banded Agate

Chalcedony (SiO2) with microcrystalline quartz

Chert (Agatized/Chalcedony variety)

Microcrystalline Quartz (SiO2)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Extrusive)