Milky Quartz
Silicon Dioxide (SiO2)
mineral
Category
Mineral, Often A Rock Given Its Aggregate Nature
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Polychrome Jasper
Silicon Dioxide (SiO2) - Impure Variety of Chalcedony
sedimentary
Agate (Dyed High-Grade Polished Slice)
Silicon dioxide (SiO2), Chalcedony crystal variety
mineral
Fossiliferous Limestone
Limestone (composed primarily of calcite with included fossils CaCO3)
Sedimentary
Vesicular Basalt / Scoria (Stream-rounded Cobble)
Mafic extrusive igneous rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Black Tourmaline
Schorl (NaFe3Al6(Si6O18)(BO3)3(OH,F)4)
mineral
Quartz with Schorl inclusions
Silicon Dioxide (SiO2) with Sodium Iron Aluminum Borosilicate Hydroxide (Black Tourmaline)
mineral
Blue Agate (Dyed)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Tufa
Calcareous Tufa (CaCO3)
sedimentary
Shale or Argillite
Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)
Sedimentary or Metamorphic (low grade)
Chalcedony
Chalcedony (a microcrystalline variety of Quartz, SiO2)
Mineral
Banded river pebble, likely gneiss
Foliated quartz–feldspar rock, possibly banded gneiss
metamorphic
Diamond
Diamond (C)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Peridot
Olivine (Mg,Fe)2SiO4
Mineral
Cullet Glass / Slag Glass
Amorphous silica glass
man-made glass / industrial byproduct
Quartzite with Pyrite Inclusions
Metamorphic Quartz-rich Rock
metamorphic
Limestone (Chalk / Calcite Rock)
Calcium Carbonate (CaCO3)
sedimentary
Man-made Slag (Industrial Byproduct)
Anthropogenic Glassy Residue
not a natural rock
Vesicular Basalt
Vesicular Basalt
igneous
Sandstone (Graywacke)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Goldstone (Red)
Aventurine Glass (Cupriferous glass)
Synthetic Glass (Man-made)
Banded Greywacke
Greywacke (Lithic wacke)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Milky Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Quartz (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Black Onyx (Tumbled)
Chalcedony (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Jasper with Hematite (Red Jasper)
Silicon Dioxide with Iron Oxide (SiO2 and Fe2O3)
sedimentary (physico-chemical precipitate)
Dyed Agate
Silicon Dioxide (SiO2) - Chalcedony variety
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Likely banded gneiss fragment
Gneiss, a foliated metamorphic rock (exact mineral identification is uncertain from the image)
metamorphic
Sandstone Pebbles
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Quartz Sandstone
Quartz Arenite
sedimentary
Ferruginous Sandstone (Ironstone)
Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) - Limestone
sedimentary
Jasper with Quartz Vein
Silicon Dioxide (SiO2) with impurities
sedimentary