Sandstone
Arenite (primarily SiO2)
sedimentary
Category
Synthetic Material (Not A Rock Or Mineral)
Browse synthetic material (not a rock or mineral) specimens identified by the Rock Identifier community.
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Tumbled jasper (likely ocean or orbicular jasper)
Microcrystalline quartz (chalcedony), SiO₂, with iron oxides and dark accessory minerals
mineral
Green Slag Glass
Cullet (Amorphous Silicon Dioxide with impurities)
Man-made rock-like material
Granite
Granite (Plutonic Igneous Rock)
igneous
Granite (with alteration)
Granite (Felsic intrusive igneous rock)
igneous
Weathered quartz-rich pebble, possibly milky quartz or chalcedony
Quartz, SiO₂; exact variety uncertain from the image
mineral
Peridot (Olivine)
Olivine (Magnesium Iron Silicate), (Mg,Fe)2SiO4
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone Pebble
Arenite (SiO2 primarily)
sedimentary
Sandstone (likely Graywacke or Arkose)
Clastic Sedimentary Rock (primarily SiO2 with various lithic fragments)
sedimentary
Amethyst
Amethyst (SiO2 - Silicon Dioxide with iron impurities)
Mineral
Quartz (Grain)
Silicon Dioxide (SiO2)
mineral
Tumbled citrine or iron-stained quartz
Quartz (SiO₂), likely iron-oxide-stained or natural citrine
mineral
Sandstone (Ferruginous)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Milky Quartz (Water-worn Pebble)
Silicon Dioxide (SiO2)
mineral
Green aventurine beads
Quartz (SiO₂), typically green quartzite/aventurine with fuchsite mica inclusions
mineral
Chert (Septarian or Nodular variety)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Conglomerate
Quartz Conglomerate (clastic sedimentary rock)
sedimentary
Granite / Diorite (Granodiorite)
Granodiorite / Quartz Diorite
igneous
Magnetite (Lodestone)
Iron(II,III) oxide (Fe3O4)
mineral
Pink Granite
Granite (Felsic intrusive igneous rock)
igneous
Raw gold nugget or gold-bearing quartz
Native gold (Au), possibly with quartz (SiO₂) and iron-oxide staining
mineral
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Dendritic Agate (Tree Agate)
Chalcedony (Silicon Dioxide, SiO2) with Manganese or Iron Oxide inclusions
mineral
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Sandstone with Iron Oxide Staining
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Tumbled sodalite beads
Sodalite, Na8(Al6Si6O24)Cl2, commonly with minor white calcite or nepheline
mineral
Ruby in Kyanite
Al2O3 (Corundum) in Al2SiO5 (Kyanite-Fuchsite-Quartz)
metamorphic
Asphalt Chunk (with aggregate)
Bituminous concrete / Anthropogenic conglomerate
sedimentary (anthropogenic/man-made conglomerate)
Chert Breccia
Brecciated Chert (Microcrystalline Silica, SiO2)
sedimentary
Chrysocolla (with Malachite / Secondary Copper Minerals)
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O
mineral
Red Sandstone
Arenite (with Iron Oxide / Hematite cementation)
sedimentary
Sandstone (likely Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Banded sandstone pebble
Lithic or quartz-rich sandstone; exact composition requires testing
sedimentary
Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Polished dendritic jasper or agate slab
Microcrystalline quartz (SiO₂), likely jasper with chalcedony and iron/manganese dendrites
mineral
Red Sandstone Pebble
Arenite (Iron-oxide stained)
sedimentary
Cubic Zirconia (CZ)
Cubic Zirconium Dioxide (ZrO2)
mineral (synthetic)
Diorite
Phaneritic Intermediate Plutonic Rock
igneous
Quartz Vein Outcrop
Silicon Dioxide (SiO2)
mineral
Sandstone with Iron Oxide Staining
Arenite with Limonite/Hematite alteration
sedimentary
Gabbroic rock, possibly hornblende gabbro
Gabbro; coarse-grained mafic silicate rock dominated by plagioclase and pyroxene, with possible hornblende and magnetite
igneous