Sandstone (River Cobble)
Sandstone (principally composed of Quartz, SiO2)
sedimentary
Category
Sedimentary Rock (Possibly Composed Of Various Minerals)
Browse sedimentary rock (possibly composed of various minerals) specimens identified by the Rock Identifier community.
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Carnelian and White Quartz Bracelet
Silicon Dioxide (SiO2) - specifically Carnelian (Chalcedony) and Rock Crystal/Snow Quartz
mineral
Granite Gneiss
Gneiss (derived from granitic protolith)
metamorphic
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartz-rich)
Arenite (Quartz Arenite)
sedimentary
Lapis Lazuli
Na8(Al6Si6O24)S2 (Lazurite is the primary constituent mineral)
metamorphic
Mixed Tumbled Gemstones and River Rocks
Mixed Decorative Stones (predominantly Silicon Dioxide - SiO2 variants)
Mixed (Igneous, Sedimentary, Metamorphic, and Minerals)
Sandstone (Fossiliferous)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Weathered quartz-rich granitoid (likely granite or granodiorite)
Granite–granodiorite; chiefly quartz (SiO₂), feldspar, and minor mica/amphibole
igneous
Sandstone (Garden Boulder)
Sandstone (SiO2 dominated)
sedimentary
Sandstone (Heart-shaped pebble)
Sedimentary Quartz Sandstone
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 cementation)
sedimentary
Sandstone (Quartzose)
Arenite (composed mainly of SiO2)
sedimentary
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Mixed rock and mineral collection
Mixed lithologies; likely quartz, feldspar, basalt, granite, chert, sandstone, and metamorphic rocks
igneous, sedimentary, metamorphic, mineral
Sandstone (Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Polished brecciated jasper
Silicified breccia, chiefly microcrystalline quartz (SiO₂) with iron-oxide staining
mineral
Fossil Shark Tooth
Selachii fossil
fossil
Diorite (Salt and Pepper Rock)
Phaneritic Plutonic Diorite; chemical composition roughly 52-63% silica (SiO2)
igneous
Granite Pebble
Granite
igneous
Quartz Crystal Point
Silicon Dioxide (SiO2)
mineral
Sandstone with Bedding Planes
Arenite (Sedimentary rock composed primarily of sand-sized minerals)
sedimentary
Chalky Limestone
Carbonate sedimentary rock (CaCO3)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Granite (Pebble)
Intrusive Felsic Igneous Rock
igneous
Milky quartz (rough quartz specimen)
Quartz, silicon dioxide (SiO₂)
mineral
Greisen
Greisen
Metamorphic
Iron-stained quartz-rich rock, possibly jasper/quartzite
Quartz (SiO₂) with iron-oxide staining; likely ferruginous quartzite or jasper
metamorphic
Lapis Lazuli (Low Grade)
Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2)
metamorphic
Chalcedony
Silicon Dioxide (SiO2)
mineral
Dark igneous rock, likely basalt
Basalt; chiefly plagioclase feldspar, pyroxene, and possibly olivine
igneous
Turquoise in Matrix
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
mineral
Red Sandstone
Arenite
sedimentary
Weathered granitic rock (tentative)
Granite, composed mainly of quartz, feldspar, and mica
igneous
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Banded)
Arenite
sedimentary
Sandstone
Quartzose Sandstone (Sedimentary Rock)
sedimentary
Pyrite with Iron Oxides (Fool's Gold in Matrix)
Iron Sulfide (FeS2)
mineral