Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Category
Not A Rock (Synthetic Material)
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Sandstone
Arenite (predominantly SiO2)
sedimentary
Sandstone (with minor quartz and possible clay components)
Clastic Sedimentary Rock (SiO2 dominated)
sedimentary
Bivalve Fossil in Sedimentary Matrix
Fossiliferous Mudstone (Class: Bivalvia)
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Crazy Lace Agate
Microcrystalline Quartz (SiO2)
sedimentary
Unakite
Epidotized Granite
metamorphic
Sandstone (Ferruginous)
Arenite (Fe2O3 enriched)
sedimentary
Jasper
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Olivine Weathered Rock (Dunite)
Dunite ((Mg, Fe)2SiO4)
igneous
Gray chalcedony (microcrystalline quartz)
Chalcedony, SiO₂; likely common gray/blue-gray variety
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Shale
Fissile mudrock (composed of clay-sized particles and detrital grains)
sedimentary
Serpentinite
Serpentinite (a rock composed predominantly of serpentine group minerals)
metamorphic
Sandstone
Sedimentary Rock (Quartz Arenite)
sedimentary
Sandstone nugget
Arenite (primarily Quartz SiO2)
sedimentary
Sandstone (Quartz-rich)
Arenite
sedimentary
Sandstone
Arenite (SiO2 based with cement)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Likely weathered quartz-rich stone
Indeterminate; possibly quartz-bearing granite or milky quartz
mineral
Quartz (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
sedimentary
Limonite (Iron Ore)
FeO(OH)·nH2O
mineral
Fossilized Shark Tooth
Chondrichthyes (Class) fossilized tooth
fossil
Quartz-rich breccia or quartzite with iron-oxide veining
Microcrystalline to granular SiO₂ (quartz), with hematite/goethite and minor feldspar or mica
metamorphic
Obsidian Arrowhead
Volcanic Glass (SiO2)
igneous
White chalcedony or quartz-rich pebble
Microcrystalline quartz (SiO₂), possibly with minor calcite or feldspar
mineral
Banded Gneiss (with Quartz Vein)
Gneiss (Metamorphic rock of varying mineralogy)
metamorphic
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2 with minor Fe2O3)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Basalt
Basalt (Mafic volcanic rock)
igneous
Sandstone Pebble
Quartzose Sandstone (Sedimentary Rock)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Raw Calcite
Calcium Carbonate (CaCO3)
mineral
Greenstone (Epidosite or Serpentinite)
Metabasalt / Epidote-Chlorite Schist
metamorphic
Sandstone (Ferruginous)
Arenite (variable SiO2 with Fe2O3 staining)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 based with various cements)
sedimentary
Chert (with Quartz Vein)
Chert (Siliceous sedimentary rock, predominantly Microcrystalline Quartz SiO2)
sedimentary
Sandstone (Calcareous or Ferruginous)
Clastic sedimentary rock (SiO2 with CaCO3 or Fe2O3 cement)
sedimentary