Greenstone / Serpentinite Pebble
Serpentinite (Hydrated Magnesium Silicate, Mg3Si2O5(OH)4)
metamorphic
Category
Biogenic Material
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Tumbled green jasper (probable serpentine-rich stone)
Jasper, microcrystalline quartz (SiO₂), possibly mixed with serpentine or chlorite
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Red Sandstone or Brick Fragment
Arenite (if sandstone)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Sandstone Pebble
Sandstone (primarily Quartz, SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Tree Agate
Silicon dioxide (SiO2)
Mineral
Asphalt (Road Aggregate)
Bituminous conglomerate
sedimentary
Petrified Wood
Petrified Wood (Silicified Wood)
fossil
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Amber
Succiniferous organic material (Succinite)
fossil
Quartz Sand
Silicon Dioxide (SiO2)
sedimentary
Crushed Limestone
Calcium Carbonate (CaCO3)
sedimentary
Red Sandstone
Arenite (Iron-rich)
sedimentary
Serpentinite (or Green Quartz Pebble)
Mg3Si2O5(OH)4 (Serpentine group) / SiO2 (Quartz mix)
metamorphic
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Granite
Granite
Igneous
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Concrete / Conglomerate (Man-made)
Artificial Conglomerate (Cementitious Composite)
sedimentary
Asphalt / Road Aggregate
Bituminous Conglomerate (synthetic)
sedimentary
Flint
SiO2 (Microcrystalline Quartz / Chert)
sedimentary
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Sandstone / Fossil Fragment
Fossiliferous Sedimentary Matrix with Indeterminate Fossil Material
fossil
Glacial Erratic (Graywacke/Sandstone)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Concrete
Anthropogenic Conglomerate
sedimentary
Crushed Granite and Quartz Gravel
Composite Igneous and Silicate Rock Aggregate
igneous
Crushed Stone Ballast
Crushed Limestone or Granite Aggregate
sedimentary
Coal
Combustible sedimentary rock
sedimentary
Sand
Siliciclastic sediment / Quartz sand (SiO2)
sedimentary
Gravel and Sand Aggregate
Unconsolidated Clastic Sediment
sedimentary
Dragon Vein Agate (Dyed/Treated)
Agate (SiO2)
mineral
Fossilized Nut / Coprolite / Concretion
Trace Fossil / Permineralized Plant Material
fossil
Sea Glass
Man-made vitreous material
mineral
Slag (Industrial Byproduct)
Anthropogenic Vitreous Silicate material
igneous
Clay Brick
Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)
metamorphic (man-made/anthropogenic)
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Tumbled green gemstone, likely dyed howlite or serpentine
Most consistent with dyed howlite (Ca2B5SiO9(OH)5); exact identification requires testing
mineral
Iron Meteorite / Chondrite (Possible)
Extraterrestrial stony-iron or chondritic meteorite
meteorite
Chert Pebble
Cryptocrystalline Quartz (SiO2)
sedimentary