Mineraloid (Human Made Geological Specimen)

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Painted River Rock (likely Quartzite or Granite)

Quartzite or Granitic Gneiss (painted)

Quartz

Quartz (SiO₂)

Yellow-green jasper or serpentine-rich rock

Likely microcrystalline quartz (SiO₂) with iron-bearing and/or serpentine minerals; exact identification requires testing

Green aventurine (likely)

Quartzite dominated by quartz (SiO₂), colored green by fuchsite mica or chlorite

Smoky Quartz and Feldspar Pegmatite

Granitic Pegmatite (chiefly SiO2 and KAlSi3O8)

Pyrite

Iron Sulfide (FeS2)

Clear Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Weathered sandstone or iron-rich sedimentary fragment

Quartz-rich sandstone, possibly ferruginous sandstone (SiO₂-dominant)

Basalt with Caliche Crust

Aphanitic Mafic Igneous Rock with Calcium Carbonate (CaCO3) coating

Chert Nodule

Chert (SiO2)

Smoky Quartz with Milky Quartz

Silicon Dioxide (SiO2)

Amygdaloidal Basalt

Extrusive mafic igneous rock with amygdules

Glaucophane Schist (Blueschist)

Blueschist facies metamorphic rock

Basalt with Pahoehoe flow texture

Vesicular Basalt (Aphanitic Mafic Igneous Rock)

Fossiliferous Sandstone (with Brachiopod or Bivalve mold)

Clastic Sedimentary Rock with Macrofossil Mold

Moss Agate

Cryptocrystalline Quartz (SiO2 with Manganese or Iron Oxide inclusions)

Diamond

Carbon (C)

Pearl

Organic gemstone (Calcium carbonate - CaCO3)

Chert (Flint)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Chert (Arrowhead/Scraper Preform)

Silicon dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz Crystal (specifically a small Clear Quartz point)

Silicon Dioxide (SiO2)

Fossilized Shark Tooth (Dermal Denticle or worn tooth fragment)

Elasmobranchii (fossil remains)

Bull Quartz (Milky Quartz)

Quartz (Silicon Dioxide - SiO2)

Milky quartz-rich vein rock

Quartz, SiO₂, likely massive or microcrystalline quartz

Quartz (Crystal Cluster)

Silicon Dioxide (SiO2)

Banded Agate (Tumbled)

Silicon Dioxide (SiO2) - variety of Chalcedony

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz (Chatoyant or Milky variety)

Silicon Dioxide (SiO2)

Iron-Stained Quartz

Silicon Dioxide (SiO2) with Iron Oxide/Limonite coating

Chrysocolla

Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·n(H2O)

Labradorite

Labradorite (Ca,Na)(Al,Si)4O8

Banded Sandstone (Liesegang Rings)

Sedimentary sandstone with Iron oxide precipitates

Red Jasper

Microcrystalline Quartz (Chalcedony), SiO2 with iron oxide inclusions

Gravel/Common Siltstone

Siltstone (fine-grained siliciclastic sedimentary rock)