Mineraloid (Human Made Geological Specimen)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Milky and Smoky variety)

Silicon Dioxide (SiO2)

Quartz (Milky Quartz pebble)

Silicon Dioxide (SiO2)

Phantom Quartz with Chlorite and Hematite inclusions

Silicon Dioxide (SiO2) with inclusions of Chlorite group minerals and Hematite (Fe2O3)

Granite

Granite (a phaneritic intrusive igneous rock)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Epidote

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

Ferruginous Sandstone (Ironstone)

Sandstone with Hematite/Goethite cement (SiO2 + FeO(OH))

Pyrite

Iron Sulfide (FeS2)

Citrine Quartz

Silicon Dioxide (SiO2)

Galena

Galena (Lead Sulfide), PbS

Petrified Wood

Silicified Wood (SiO2)

Garnet Schist or Garnet-bearing Quartzite

Metamorphic rock containing Almandine Garnet (Fe3Al2(SiO4)3) and Quartz (SiO2)

Sandstone with Secondary Mineral Encrustation

Arenite with Silica/Calcite deposits (SiO2 or CaCO3)

Chert (specifically Flint or Jasper variant)

Microcrystalline Quartz (SiO2)

Basalt with Pahoehoe flow texture

Vesicular Basalt (Aphanitic Mafic Igneous Rock)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various additives

Geode (unopened)

SiO2 - Chert-shelled concretion (mostly Quartz)

Milky Quartz (Ferruginous variety)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 based typically)

Basalt

Basalt (composition of plagioclase, pyroxene, and olivine)

Quartz (Clear/White)

Silicon Dioxide (SiO2)

Jasper (specifically Yellow/Red Jasper)

Silicon Dioxide (SiO2) with iron oxide inclusions

River Pebble (Quartzite/Chert)

Quartzite with inclusions (SiO2)

Fairy Stone (Staurolite Twin)

Staurolite (Fe,Mg,Zn)2Al9Si4O22(OH)2

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Dendritic Agate or Spotted Quartzite

Silicon Dioxide (SiO2) with inclusions

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Rough Diamond

Diamond (pure Carbon, C)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Fossilized Shark Tooth (Dermal Denticle or worn tooth fragment)

Elasmobranchii (fossil remains)

Bull Quartz (Milky Quartz)

Quartz (Silicon Dioxide - SiO2)

Rose Quartz

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

Schist (Garnet-Mica Schist)

Garnetiferous Mica Schist (primarily Muscovite/Biotite and Almandine Garnet)

Limestone Pebble

Calcium Carbonate (CaCO3)

Yellow Chert (Gold-toned Jasper)

Silicon Dioxide (SiO2)

Granite Cobble

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

Ferruginous Quartz

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)