Green Glass (often marketed as 'Obsidian' or 'Green Quartz')
Amorphous Silica (SiO2) with copper or chromium additives
Mineraloid (Man-made)
Category
Not A Natural Rock
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Diamond
Diamond (C)
mineral
Flint / Chert (Hag Stone)
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Tumbled and polished quartz crystal points
Quartz (silicon dioxide, SiO₂), chiefly rock crystal with smoky or included varieties
mineral
Yellow Howlite (Dyed Magnesite/Howlite)
Dyed Ca2B5SiO9(OH)5 (Howlite) or MgCO3 (Magnesite)
mineral
River Stone (Limestone)
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Small polished dark mineral or gemstone fragment
Indeterminate; possibly smoky quartz, obsidian, or dark tourmaline
mineral
Sandstone (Pebble/Conglomerate fragment)
Sandstone (clastic sedimentary rock)
Sedimentary Rock
Hag Stone
Perforated Flint / Chert Node
sedimentary
Diamond (or Cubic Zirconia)
Carbon (C) or Zirconium Dioxide (ZrO2)
mineral
Shale or Argillite
Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)
Sedimentary or Metamorphic (low grade)
Green cabochon gemstone pendant, likely turquoise or dyed green turquoise
Probably turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; exact identification requires testing
gemstone
Raw Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Opalite
Synthetic Glass (Hydrated Silica Simulant)
mineral
Crackled Quartz (Dyed)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Quartz (SiO2) with natural radiation
mineral
Black Onyx
Silicon Dioxide (SiO2) with cryptocrystalline structure
mineral
Orange Quartz (Citrine Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst and Citrine (Ametrine Mix)
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral
Cubic Zirconia
Zirconium Dioxide (ZrO2)
mineral
Quartz (Engineered Stone Countertop)
Silicon Dioxide (SiO2) within a resin matrix
igneous
Quartzite
Quartzite
Metamorphic
River Cobble (likely Sandstone or Siltstone type)
Sandstone or Siltstone (common rock types that form river cobbles)
Sedimentary Rock (specifically a clastic sedimentary rock formed into a cobble)
Druzy Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Diamond
Carbon (C)
mineral
Diamond inlaid in Jewelry
Carbon (C)
mineral
Diamond (set in jewelry)
Diamond (Carbon, C)
mineral
Yellow Quartz (Citrine Quartzite)
Silicon Dioxide (SiO2)
metamorphic
Diamond (Colorless/White)
Carbon (C)
mineral
Golem
Megaton Pokémon (Lithos sapiens megalithos)
igneous/sedimentary (Rock/Ground type)
Yellow Quartz (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Black Onyx
Chalcedony (Silicon Dioxide, SiO2)
mineral
Pink Sapphire
Corundum (Al2O3 with trace Chromium and Iron)
mineral
Cubic Zirconia (CZ)
Zirconium dioxide (ZrO2)
mineral
Sandstone with Iron Weathering
Quartz Arenite / Weathered Sandstone
sedimentary
Slate
Foliated Metamorphic Rock (primarily composed of quartz, illite, chlorite, and micas)
metamorphic
Hag Stone
Natural Perforated Flint or Chert (SiO2)
sedimentary
Cherry Quartz
SiO2 (Silicon Dioxide with iron-rich inclusions/dye)
mineral
Ruby in Zoisite (Anyolite) or possibly a dyed stone/agate
Anyolite (Ruby in green zoisite) or artificially altered chalcedony
metamorphic
Opalite
Synthetic Opalized Glass (SiO2 + additives)
mineraloid (man-made)
Yellow Quartz / Citrine Quartz
Silicon Dioxide (SiO2)
mineral