Quartzite Pebbles
Crystalline silica rock (SiO2)
metamorphic
Category
Man Made Material
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Shale
Fissile Mudrock (Clay-rich Sedimentary Rock)
sedimentary
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Sandstone (Ferruginous)
Sandstone (Clastic sedimentary rock, predominantly SiO2 with Fe2O3 cement)
sedimentary
Quartzite Cobble
Quartzite (predominantly SiO2)
metamorphic
Sandstone (Yellow/Tan)
Clastic sedimentary rock (primarily SiO2 with iron oxide staining)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Red)
Arenite (SiO2 with Fe2O3)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Sandstone
Arenite/Quartz Arenite
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3/FeO(OH) cementing agents)
sedimentary
Ferruginous Sandstone (Ironstone)
Sedimentary rock with Limonite/Goethite cement
sedimentary
Silty Sand / Loam
Unconsolidated Clastic Sediment (Silicon Dioxide / Alumino-silicates mixture)
sedimentary
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Granite
Phaneritic intrusive igneous rock
igneous
Pink Calcite
Calcium Carbonate (CaCO3)
mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Flint nodule
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Vein-bearing sandstone or quartzite cobble
Quartz-rich sandstone with white quartz veins; possibly metamorphosed to quartzite
sedimentary
Copper ore with native copper and quartz/calcite
Malachite–chrysocolla–cuprite-bearing copper ore, likely with quartz or calcite gangue
mineral
Likely foliated metamorphic rock, possibly schist
Mica schist or micaceous quartzite; exact identification is uncertain from the photograph
metamorphic
Weathered quartz-rich rock, likely silicified limestone or quartzite
Microcrystalline quartz (SiO₂), possibly with calcite (CaCO₃) and iron-oxide staining
metamorphic
Likely quartz-bearing mineral aggregate
Quartz (SiO₂), possibly mixed with mica or feldspar
mineral
Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Chert (or Carnelian Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Red Sandstone (Arkose)
Clastic Sedimentary Rock (Lithic Arkose)
sedimentary
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2 (Tremolite-Actinolite series)
metamorphic
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2 with minor Fe2O3)
sedimentary
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Granite
Granite (Phaneritic intrusive igneous rock) - Composition: SiO2, Al2O3, K2O, Na2O
igneous
Sandstone (Banded)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite
Sedimentary
Fossil Coral
Rugosa or Tabulata coral fossil (Calcium Carbonate, CaCO3)
fossil
Quartz-rich mica schist (probable)
Muscovite–quartz schist, possibly with feldspar and biotite
metamorphic