Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Category
Anthropogenic (Man Made Material)
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Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary
Botryoidal Chalcedony (Geode fragment)
Silicon Dioxide (SiO2)
mineral
Sandstone (Beach Pebble)
Clastic sedimentary rock (primarily Quartz and Feldspar)
sedimentary
Quartz Chip
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon dioxide (SiO2)
Mineral / Sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Clastic Sedimentary Rock (composed mostly of quartz, SiO2)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Sandstone
Arenite (SiO2 principal)
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz with Limonite/Goethite staining)
sedimentary
Sandstone (likely Quartzose)
Arenite (SiO2 principal mineral)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Moonstone
Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8
mineral
River Pebble (Gravel)
Clastic sedimentary rock (likely Siltstone or Mudstone pebble; SiO2 with various impurities)
sedimentary
Silver (Morgan Dollar)
Native Silver (Ag) - 90% Silver, 10% Copper alloy
mineral
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 cement)
sedimentary
Amazonite
K(AlSi3O8), Microcline (potassium feldspar)
mineral
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Iron Slag
Iron Slag (Industrial Vitreous Material)
Mineral/By-product
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Gravelly, weathered sediment (likely glacial till)
Unconsolidated diamicton; mixed lithologies, commonly including quartz, feldspar, and weathered silicate rock fragments
sedimentary
Tumbled orange chalcedony (likely carnelian)
Microcrystalline quartz, SiO₂; iron-bearing variety commonly termed carnelian
mineral
Weathered quartz-rich stone, possibly fossiliferous limestone
Indeterminate; likely calcite-rich limestone (CaCO₃) or weathered quartz-bearing rock
sedimentary
Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint Nodules)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Chert (SiO2)
sedimentary
Chert
Microcrystalline silica (SiO2)
sedimentary
Weathered gray metamorphic rock, likely phyllite or slate
Micaceous quartz–phyllosilicate rock; commonly quartz + muscovite/illite ± chlorite
metamorphic
Likely weathered quartz-rich rock fragment
Uncertain; possibly granitic pegmatite or quartz-bearing metamorphic rock
igneous
Milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Wood Paneling
Engineered Wood / Plywood Paneling
not a rock
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Polished blue sodalite cabochons
Sodalite, Na₈Al₆Si₆O₂₄Cl₂
mineral
Polished dendritic agate or jasper
Microcrystalline quartz (SiO₂), likely chalcedony with manganese-oxide dendrites
mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Sandstone
Sedimentary Clastic Rock
sedimentary
Jasper with Quartz Veining
Microcrystalline quartz (SiO2) with iron oxide impurities
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary