Chert (often called Flint or Jasper if reddish)
Microcrystalline Quartz (SiO2)
sedimentary
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Amethyst Geode
Silicon Dioxide with impurities (SiO2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Gold Nugget
Native Gold (Au)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Conglomerate
Conglomerate
sedimentary
Copper Nugget
Native Copper (Cu)
mineral
Native Gold (in Jewelry)
Gold (Au)
mineral
Gold
Gold (Au)
mineral
Dinosaur Skull Fossil (Velociraptor Replica)
Velociraptor mongoliensis fossil specimen in sedimentary matrix
sedimentary
Dyed Agate
Agate (Silicon Dioxide, SiO2)
Mineral
Black Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Quartzite River Rock
Metamorphic Rock (Quartzite)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Black Obsidian
Obsidian / Amorphous volcanic glass (SiO2)
igneous
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Quartzite with inclusions
Metamorphic Rock (Mainly SiO2)
metamorphic
Obsidian
Obsidian (Volcanic Glass)
igneous
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Quartzite River Pebble
Quartzite (mostly SiO2)
metamorphic
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert (Pebble)
Microcrystalline to Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite River Rock
Metamorphic Quartzite (SiO2)
metamorphic
Obsidian (Gold Sheen)
Obsidian (SiO2 + impurities)
igneous
Shale or Mudstone River Pebble
Argillaceous sedimentary rock
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Green Glass Slag
Amorphous Silicon Dioxide (SiO2) with metal oxide impurities
mineraloid (man-made)
Chert (River Cobble)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite Cobble
Metamorphosed Sandstone (SiO2)
metamorphic
Quartzite (Ferruginous)
Metamorphosed Quartz Sandstone (SiO2 with Fe2O3 inclusions)
metamorphic
Black Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Pink Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineral
Obsidian
Obsidian (Amorphous volcanic glass, predominantly SiO2)
igneous