Khondalite
Garnet-Sillimanite-Graphite Gneiss
metamorphic
Category
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Red Sandstone
Arenite (with Iron Oxide)
sedimentary
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Granite Water-Worn Pebble
Intermediate to Felsic Phaneritic Igneous Rock
igneous
Porphyritic Basalt
Aphanitic-Porphyritic Basalt
igneous
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Granodiorite
Granodiorite (containing Quartz, Plagioclase Feldspar, Biotite, and Hornblende)
igneous
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Basalt Pebble
Basalt
igneous
Amygdaloidal Basalt
Basalt with Secondary Mineral Infillings
igneous
Granodiorite (foreground) and Rose Quartz (background)
Granodiorite / Quartz (SiO2)
igneous
Pink Granite
Granite (Alkali Feldspar Granite)
igneous
Basalt (Vesicular)
Basalt (Mafic volcanic rock)
igneous
Quartzite River Rock
Quartzite (SiO2 based metamorphic rock)
metamorphic
Epidote with Quartz/Feldspar
Epidote (Ca2(Al, Fe)3(SiO4)3(OH)) with associated minerals in a host rock
Mineral/Metamorphic rock
Limestone with Calcite Veins
Calcium Carbonate (CaCO3)
sedimentary
Scoria (Lava Rock)
Scoria
igneous
Quartz (River Siltstone Quartzite Pebble)
Silicon Dioxide (SiO2)
metamorphic
River Cobble with Algae Patina
Weathered Chert or Quartzite pebble (SiO2 dominated)
sedimentary
Basalt (Vesicular or Weathered)
Aphanitic Mafic Igneous Rock (Basalt)
igneous
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Vesicular Basalt with Siltstone
Mafic Volcanic Rock (Basaltic Composition)
igneous
Basalt (River Cobble)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Orca Agate (Blue Chalcedony)
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Quartz with Mica
Silicon Dioxide (SiO2) with Phyllosilicates (Mica)
mineral
Sedimentary rock with quartz veining
Laminated siltstone or mudstone with hydrothermal quartz veins
sedimentary
Banded Calcite (often sold as 'Travertine' or 'Mexican Onyx')
Calcium Carbonate (CaCO3)
sedimentary
Banded Agate
Cryptocrystalline Quartz (SiO2) with iron oxide inclusions
mineral
Banded Siltstone
Siltstone with planar bedding
sedimentary
Lake Superior Agate
Silicon Dioxide (SiO2)
mineral
Unakite
Epidotized Granite
metamorphic
Serpentinite
Serpentinite (composed largely of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile: Mg3Si2O5(OH)4)
metamorphic
Unakite
Unakite (Epidotized Granite)
metamorphic
Sandstone
Arenite
sedimentary
Green Chert
Microcrystalline Quartz (SiO2)
sedimentary
Glauconitic Sandstone
Glauconitic Sandstone with high Glauconite concentration ((K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Basalt
Basalt (Mafic Extrusive)
igneous