Bauxite
Bauxite (Al2O3·2H2O)
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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Bauxite (Iron-stained Chert / Ironstone Aggregate)
Hydrous aluminum oxide mixture (mainly Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Goethite α-Fe3+O(OH))
sedimentary
Bauxite (Pisolitic Bauxite)
Bauxite (mixture of Hydrous Aluminum Oxides)
sedimentary
Sandstone with Manganese Oxide Patina
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Chert (Nodule)
Chert (composition: SiO2)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Tumbled gabbro or basalt
Dark mafic igneous rock, likely gabbro (plutonic) or basalt (volcanic), composed mainly of plagioclase and pyroxene
igneous
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Clastic sedimentary rock
sedimentary
Educational Geologic Collection
Mixed Mineral and Rock Collection (Various compositions)
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Red Sandstone
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Siltstone
Siltstone (primarily composed of quartz and clay minerals)
sedimentary
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Conglomerate
Clastic sedimentary rock
sedimentary
Gneiss
Gneissic Metamorphic Rock
metamorphic
Sandstone
Sedimentary Clastic Rock
sedimentary
Sandstone
Clastic sedimentary rock
sedimentary
Weathered quartz-bearing rock, possibly calcite vein fragment
Indeterminate; likely quartz (SiO₂) with carbonate minerals such as calcite (CaCO₃)
mineral
Sandstone
Quartz arenite / Lithic sandstone
sedimentary
Sandstone (Quartz Sandstone / Iron-stained Sandstone)
Sandstone (SiO2 with iron oxide impurities)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Likely quartz pebble
Quartz (SiO₂), possibly milky or iron-stained quartz
mineral
Geode with Quartz and possibly Jasper/Hematite
Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides
Mineral/Sedimentary Geode
Sandstone
Quartz arenite / Lithic sandstone
sedimentary
Quartz Boulder
Silicon Dioxide (SiO2)
mineral
Dalmatian Jasper
Peralkaline Quartz-feldspathic Rock (Arfvedsonite-bearing)
igneous
Conglomerate
Sedimentary Conglomerate
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Sedimentary rock composed mainly of sand-sized minerals or rock grains
sedimentary
Fossilized bone fragment
Fossil bone, composed chiefly of carbonate-fluorapatite (bioapatite)
fossil
Green Jasper Pebble
Microcrystalline Quartz (SiO2) with impurities
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Graphite-rich metamorphic rock (probable graphite schist)
Graphite schist; predominantly graphite (C) with quartz and mica
metamorphic
Sandstone
Sedimentary Clastic Rock
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Generic Rock Fragment
Rock Fragment
sedimentary
Poppy Jasper
Microcrystalline Quartz (SiO2) with mineral inclusions
sedimentary
Blue Calcite Sphere
Calcium Carbonate (CaCO3)
mineral