K-Feldspar (Potassium Feldspar)
Potassium Feldspar (Microcline or Orthoclase), KAlSi3O8
mineral
Category
Anthropogenic (Man Made Material Processed By Nature)
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Rhodonite
Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3
mineral
Tumbled blue chalcedony (likely dyed)
Cryptocrystalline quartz, SiO₂; chalcedony variety
gemstone
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Sandstone
Arenite (SiO2 based with quartz, feldspar, or lithic fragments)
sedimentary
Shale or Argillite
Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)
Sedimentary or Metamorphic (low grade)
Red Jasper (with Chert/Quartz)
Silicon Dioxide (SiO2)
sedimentary
Riverstone (Siltstone/Mudstone)
Siltstone
sedimentary
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Red Sandstone (Siltstone pebble)
Arenite / Siltstone (Silicon dioxide based with hematite impurities)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Granite (Polished Countertop Surface)
Plutonic Igneous Rock (Felsic)
igneous
Arfvedsonite with Garnet
Na3(Fe2+,Mg)4Fe3+Si8O22(OH)2
igneous
Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
fossil
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone (River Cobble)
Arenite
sedimentary
Quartzite (River Pebble)
Quartzite (primarily SiO2)
metamorphic
Petrified Wood
Silicified wood (primarily SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Coprolite
Fossilized Feces
fossil
Fluorite
Calcium Fluoride (CaF2)
mineral
Sandstone
Arenite (SiO2 dominant)
sedimentary
Quartz / Common Gravel
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Serpentinite
Serpentinite (composed primarily of minerals in the serpentine group: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Muscovite Mica
KAl2(AlSi3O10)(OH)2
mineral
Banded Serpentinite (Beach Pebble)
Serpentine-group silicate rock ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Fe,Al)2O5(OH)4)
metamorphic
Coarse-grained Granite
Granitoid (Felsic Plutonic Rock)
igneous
Honey-colored chalcedony (possibly yellow/orange agate or carnelian)
Chalcedony, a microcrystalline variety of quartz; SiO₂. The color may result from iron-oxide inclusions. Exact identification is uncertain from a photograph alone.
gemstone
Slag Glass
Glassy Silicate Residue
industrial byproduct
Petrified Wood
Silicified Wood (SiO2)
fossil
Cubic Zirconia
Zirconium Dioxide (ZrO2)
mineral
Petrified Wood
Silicified Wood (SiO2 - Quartz/Chalcedony replacement)
Mineral / Fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
mineral
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of cellulose)
sedimentary