Pink faceted gemstone, likely synthetic ruby or pink sapphire
Corundum (Al₂O₃), possibly chromium-colored ruby; synthetic origin likely
gemstone
Category
Synthetic (Not A Rock Or Mineral)
Browse synthetic (not a rock or mineral) specimens identified by the Rock Identifier community.
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Sandstone
Arenite (Sedimentary Rock)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Druzy Quartz Geode
Silicon Dioxide (SiO2)
mineral
Conglomerate (or Breccia / Porphyry)
Clastic Sedimentary Rock (Conglomerate / Sandstone)
sedimentary
Tiger Iron
Tiger Iron (Composition: SiO2, Fe2O3, Fe3O4)
metamorphic
Sandstone
Clastic Sedimentary Rock
sedimentary
Hypersthene
Hypersthene ((Mg,Fe)SiO₃)
Mineral
Pyrite in Quartz Matrix
Iron Sulfide (FeS2) embedded in Silicon Dioxide (SiO2)
mineral
Quartz (Druzy or Chalcedony variant)
Silicon Dioxide (SiO2)
mineral
Quartz Crystal on Matrix
Silicon Dioxide (SiO2)
mineral
Sandstone (with secondary weathering/concretion)
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Shale
Shale (Lutite)
sedimentary
Sandstone (Graywacke)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Sandstone (Iron-stained)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Manganese Oxide Crust on Limestone
Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Limonite Concretion
FeO(OH)·nH2O (Hydrated Iron Oxide)
sedimentary
Rough turquoise-bearing rock (probable turquoise matrix)
Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O, likely in a host-rock matrix
mineral
Gneiss (Pebble)
Gneiss
metamorphic
Quartz Vein in Host Rock
Quartz (SiO2) in Mafic or Sedimentary Matrix
igneous
Limonite Stained Basalt
Hydrated Iron Oxide on Mafic Volcanic Rock (FeO(OH)·nH2O)
igneous
Shale
Sedimentary rock composed of clay minerals and quartz
sedimentary
Fossilized Dinosaur Skull (Tyrannosaurus rex)
Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica
sedimentary
Amygdaloidal Basalt with Quartz Veining
Basalt (Extrusive Igneous Rock) with Quartz (SiO2) veining
igneous
Quartz Geode with Calcite
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (with Concretion)
Arenite / Quartzose Sandstone
sedimentary
Mixed Tumbled Rocks and Minerals Collection
Mixed Minerals and Rocks (Quartz, Feldspar, Jasper, Agate, Lapis Lazuli, Sodalite, Rose Quartz, Fluorite, etc.)
mineral
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Wavellite with Quartz
Al3(PO4)2(OH,F)3 & SiO2
mineral
Small pale rock fragment
Indeterminate; possibly quartz, calcite, or a weathered feldspar-rich fragment
mineral
Sandstone
Clastic sedimentary rock
sedimentary
Rough Apatite in Matrix
Fluorapatite / Chlorapatite / Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Sandstone Pebble / Quartzite Pebble
SiO2 (Silicon Dioxide enriched sedimentary rock)
sedimentary
Sandstone (Quartzose)
Arenite (SiO2 based typically)
sedimentary
Bauxite
Bauxite (Aluminum Ore)
sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminum)
mineral
Amygdaloidal Basalt
Extrusive Igneous Rock with Secondary Mineral Fillings
igneous
Spessartine Garnet in Quartz/Feldspar Pegmatite
Spessartine (Mn3Al2(SiO4)3) in Quartz (SiO2) and Feldspar
Mineral in Igneous Rock