Man Made Glass (Not A Natural Rock Or Mineral)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Satin Spar (Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Quartz (in a rock matrix)

Quartz (SiO2)

Raw Diamond

Diamond (C)

Gold Nugget

Native Gold (Au)

Sandstone with Quartz Vein

Arenite with SiO2 intrusion

Sandstone

Arenite (SiO2 based with various mineral cements)

River Quartzite (or Quartz Cobble)

Quartzite (primarily Silicon Dioxide - SiO2)

Quartzite River Stone

Quartzite (primarily SiO2)

Yellow Quartzite Pebble

Quartzite (SiO2)

Agate (Common Chalcedony)

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide with Iron Oxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Scoria

Extrusive Basaltic Scoria

Quartzite (River Cobble)

Metamorphic Quartz-rich Rock

Red Quartzite

Quartzite (primarily SiO2)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Bismuth Crystal

Bismuth (Bi)

Gneiss (specifically Granitic Gneiss)

Gneiss (composed primarily of Quartz, Feldspar, and Biotite/Amphibole)

Quartzite with Iron Staining

Silicon Dioxide (SiO2) with Fe2O3 impurities

Mica Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Druzy Geode

Silicon Dioxide (SiO2) - Crystalline Variety

Diamond

Diamond (a metastable allotrope of carbon, C)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide - SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO₂)

Amphibolite

Amphibolite

Jasper Agate (specifically Brecciated Jasper with Agate inclusions)

Silicon Dioxide (SiO2)

Diamond (Macled/Crystal fragment)

Carbon (C), isometric crystal system

Schist

N/A (a rock type, not a mineral formula)

Limonite

FeO(OH)·nH2O (Hydrated iron oxide)

Sandstone (likely Greywacke or Lithic Sandstone)

Arenite / Wacke

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Orange Quartzite

Quartzite (primarily SiO2 with Hematite impurities)

Bloodstone (also known as Heliotrope)

Silicon Dioxide (SiO2) - variety of Chalcedony

Chert (with Chalky Cortex)

Silicon Dioxide (SiO2)