River Stone (Basalt)
Basalt
igneous
Category
Man Made Rock (Technosol)
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Basalt
Aphanitic Mafic Igneous Rock
igneous
Crushed Stone / Gravel
Aggregate (mixed lithology)
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Shale or Siltstone
Sedimentary Rock (Siliciclastic)
sedimentary
Unakite
Epidotized Granite (Composed of Orthoclase Feldspar, Epidote, and Quartz)
metamorphic
Sandstone
Arenite
sedimentary
Sandstone (Common Quartz Pebble/Rock)
Sedimentary rock / Quartz arenite
sedimentary
Gneiss
Gneissic Metamorphic Rock
metamorphic
Granite
Granite
Igneous
Sandstone
Sandstone (SiO2 dominant)
sedimentary
Limestone Cobble
Sedimentary Limestone (Calcium Carbonate, CaCO3)
sedimentary
Vesicular Basalt
Basalt with a vesicular texture
igneous
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary
Basalt with Quartz/Calcite matrix
Basalt (SiO2 with Ca/Mg/Fe silicates) on a Mineral Matrix
igneous
Basalt River Stone with Quartz Vein
Basalt (Mafic volcanic rock)
igneous
Porphyritic Andesite/Basalt or Diorite River Rock
Porphyritic Igneous Rock
Igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
River Rock (likely Siltstone or fine-grained Sandstone)
Clastic Sedimentary Rock
sedimentary
Sandstone with Secondary Mineral Encrustation
Arenite with Silica/Calcite deposits (SiO2 or CaCO3)
sedimentary
Spessartine Garnet in Quartz/Feldspar Pegmatite
Spessartine (Mn3Al2(SiO4)3) in Quartz (SiO2) and Feldspar
Mineral in Igneous Rock
Dyed Agate Slice
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Limestone (Calcium Carbonate: CaCO3)
sedimentary
Sandstone (likely Arkosic)
Arenite (SiO2 with KAlSi3O8)
sedimentary
Limestone (Weathered)
Calcium Carbonate (CaCO3)
sedimentary
Granitic Pegmatite (with Smoky Quartz and Mica)
Granitic Pegmatite (composed of SiO2, KAl2(AlSi3O10)(OH)2, and (K,Na)(AlSi3O8))
igneous
Limonite (Ironstone Concretion)
Limonite: FeO(OH)·nH2O
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Sandstone (Lithic Wacke)
Clastic sedimentary rock (primarily SiO2 with rock fragments)
sedimentary
River Pebble (likely Quartzite or Diorite)
Metamorphosed Quartz-rich Rock / Intermediate Igneous Rock
metamorphic
River Rocks (Basalt and Sedimentary Stones)
Mafic Igneous Rock (Basalt) and Clastic Sedimentary Rock
igneous and sedimentary
Quartz Geode Segment
Crystalline Silicon Dioxide (SiO2)
mineral
Agate Geode Slice (with Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Intrusive Igneous Rock (Quartz, Feldspar, Mica)
igneous
Quartz Vein in Host Rock
Silicon dioxide (SiO2) veining in silicate matrix
sedimentary
Olivine Weathered Rock (Dunite)
Dunite ((Mg, Fe)2SiO4)
igneous
Basalt
Extrusive Igneous Rock
igneous
Mixed Quartz and River Pebbles (Stone Collection)
Mixed assortment containing mainly Silicon Dioxide (SiO2)
igneous, sedimentary, metamorphic, and mineral