Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Category
Synthetic (Not A Rock Or Mineral)
Browse synthetic (not a rock or mineral) specimens identified by the Rock Identifier community.
Learn about Synthetic (Not A Rock Or Mineral) in the encyclopedia
View all →
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Tiger's Eye
Silicon Dioxide with Crocidolite (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Grey Agate (Tumbled)
Silicon Dioxide (SiO2)
mineral
Polished Black Obsidian
Volcanic Glass (70-75% SiO2)
igneous
Quartz with Iron Oxide Inclusions
Silicon Dioxide (SiO2)
mineral
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Red Sandstone Pebble
Arenite (Iron-oxide stained)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Iron-Stained Quartz (Riverside Cobble)
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
mineral
Lapis Lazuli
Complex mixture of minerals (lazurite, calcite, pyrite, and sodalite); (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Granitic Pegmatite with Muscovite Mica
Pegmatite (containing KAl2(AlSi3O10)(OH)2)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Agate
Chalcedony (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Blue Agate (Dyed Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (White/Milky)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite pebble
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Diorite (Salt and Pepper Rock)
Diorite
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt (Iron-Stained)
Mafic Volcanic Rock (Basalt)
igneous
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
mineral
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium) CuAl6(PO4)4(OH)8·4H2O
mineral
Conglomerate
Conglomerate rock
sedimentary
Obsidian
Volcanic Glass
igneous
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Calcite (or Travertine / Limestone)
Calcium Carbonate (CaCO3)
sedimentary
Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Ore)
FeO(OH)·nH2O
mineral
Dendritic Agate
Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)
Mineral
Quartz Vein in Schist
Quartz (SiO2) in Pelitic Schist
metamorphic