Shale
Lutaceous sedimentary rock
sedimentary
Category
Not A Rock (Man Made Polymer)
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Mica schist, likely biotite–muscovite schist
Mica schist; predominantly quartz, feldspar, biotite and/or muscovite mica. Exact mineral composition cannot be confirmed from the photograph alone.
metamorphic
Sandstone (Ferruginous)
Sandstone (SiO2 with iron oxide impurities)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Basalt with Quartz Vein
Basalt with silicon dioxide (SiO2) inclusion
igneous
Tumbled Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone Pebble
Sedimentary quartz arenite
sedimentary
Sandstone Concretion
Sedimentary Concretion (Quartz sand bound by mineral cement)
sedimentary
Mixed Mineral Assortment (Pyrite, Kyanite, Agate, Jasper)
FeS2 (Pyrite), Al2SiO5 (Kyanite), SiO2 (Agate/Jasper)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Granite
Igneous
Dyed Agate
SiO2
Mineral
Sandstone (Quartzose)
Arenite (SiO2 principal composition)
sedimentary
Red Painted Rock
Artificial Coated Lithic Fragment
sedimentary
Sandstone (Iron-stained)
Sandstone (rich in Quartz and Hematite/Limonite coatings)
sedimentary
General river rock or weathered cobble
Mixed rock composition
igneous/metamorphic
Gold
Aurum (Au)
Mineral (Metal)
Shale fragment
Shale (clay mineral rich sedimentary rock)
sedimentary
Shale / Mudstone
Sedimentary rock (Claystone / Mudstone / Shale)
sedimentary
Granite
Intrusive igneous rock
igneous
Fire Opal
Hydrated Silica (SiO2·nH2O)
mineral
Limonite Concretion
FeO(OH)·nH2O (Hydrated Iron Oxide)
sedimentary
Basalt
Extrusive Igneous Rock
igneous
Shale
Argillaceous Sedimentary Rock
sedimentary
Shale or Mudstone River Pebble
Argillaceous sedimentary rock
sedimentary
Granite
Intrusive Igneous Rock
igneous
Brown Chalcedony
Silicon Dioxide (SiO2)
mineral
Granite with Pyrite or Mica
Phaneritic intrusive igneous rock
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Basalt Pebble
Basalt
igneous
Granite
Intrusive igneous rock (Felsic)
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Intrusive Igneous Rock (Felsic)
igneous
Granite Pebble
Phaneritic intrusive igneous rock
igneous
Granite Pebble
Intrusive Igneous Rock (Quartz, Feldspar, Mica)
igneous
Rhinestone
Artificial Glass/Crystal
gemstone
Granite
Felsic Intrusive Igneous Rock
igneous
Granite
Phaneritic plutonic felsic rock
igneous
Quartz Geode in Sedimentary Host Rock
Silicon Dioxide (SiO2) in Carbonate Matrix
sedimentary