Granite
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Category
Synthetic (Not A Natural Rock)
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Amethyst
Silicon Dioxide with iron impurities (SiO2)
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Intrusive Felsic Igneous Rock
igneous
Pink Granite
Phaneritic Felsic Igneous Rock
igneous
Tumbled quartz-rich stone, possibly blue quartz or granite
Quartz (SiO₂), with probable feldspar and dark accessory minerals
mineral
Pebble (likely Sandstone or Granitic Pebble)
Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)
Rock (likely Sedimentary)
Serpentine
Antigorite/Chrysotile group (Mg3Si2O5(OH)4)
metamorphic
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Sandstone (Quartzose)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Pink Granite Boulder
Granite (Felsic Intrusive Igneous Rock)
igneous
Vesicular Basalt or Hag Stone
Basalt (with vesicles) or bored Sedimentary Rock
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Red Sandstone
Arenite (Iron-rich Sandstone)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Green Aventurine
Silicon Dioxide (Quartz) with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Weathered river pebble, likely quartz-rich sandstone or iron-stained quartzite
Provisional identification: quartz-rich sandstone/quartzite; exact composition cannot be confirmed from the image
sedimentary
Dyed Blue Agate Slice
Silicon Dioxide (SiO2) - Variety Agate
mineral
Milky Quartz Pebble (Beach Agate / Quartz)
Silicon Dioxide (SiO2)
mineral
Shale (or Slate / Coal / Jet)
Laminated fine-grained sedimentary rock (predominantly clay minerals)
sedimentary
Small dark mineral/rock fragment
Indeterminate; possibly magnetite-bearing basalt or iron-rich slag
mineral
Dyed Agate
Silicon Dioxide (SiO2) with artificial colorants
mineral
Emerald in Matrix
Beryllium Aluminum Silicate (Be3Al2(SiO3)6) with Chromium/Vanadium
gemstone
Tumbled granite or granitic gneiss
Granite, typically quartz + feldspar + mica; possibly foliated granitic gneiss
igneous
White quartz pebble (likely milky quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Amethyst in Matrix
Amethyst (Silicon Dioxide), Formula: SiO2
mineral
Emerald crystal in host rock
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
gemstone
Granite
Granite (composed of Quartz, Felspar, and Mica)
igneous
Granite
Felsic intrusive igneous rock (Granite)
igneous
Granite
Granite (Felsic Intrusive Igneous Rock)
igneous
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Granite
Phaneritic plutonic rock (SiO2 > 69%)
igneous
Man-made Carved Stone (Scream Mask/Skull motif)
Carved Soapstone or Serpentine-rich rock
Anthropogenic (Man-made artifact)
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Coral Rock (Coquina)
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Hag Stone
Calcareous sedimentary rock (often Chert, Flint, or Limestone)
sedimentary
River Rock (Basalt/Greywacke)
Aphanitic Basalt or Lithic Sandstone (Greywacke)
igneous
Banded Chalcedony (Agate)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Likely weathered metallic mineral or slag fragment
Indeterminate; possibly iron-rich sulfide/oxide material or industrial slag
mineral
Amethyst Quartz (Tumbled)
Amethyst (Silicon Dioxide with iron impurities, SiO2)
mineral
Blue Agate (Tumbled and Dyed)
Silicon Dioxide (SiO2) with likely organic dyes
mineral
Jasper
Silicon dioxide / Chalcedony (SiO2)
Sedimentary