Yellow Sapphire
Corundum (Al2O3)
gemstone
Community gallery
All rocks & minerals
Every specimen the Rock Identifier community has discovered, from desert agates to deep-sea basalts.
Explore the rock & mineral encyclopedia
View all →
Bauxite
Aluminum ore / Hydrated aluminum oxides
sedimentary
Quartz (Rose Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Beach Pebble (Basalt / Volcanic Rock)
Aphanitic Igneous Rock / Basalt
igneous
Jasper Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Flint with Iron Oxide Inclusions
SiO2 (Microcrystalline Quartz) with Goethite/Limonite inclusions
sedimentary
Quartzite Pebble
Metamorphic Quartzite
metamorphic
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Red Sandstone Pebble
Sedimentary Quartz Arenite / Arkose
sedimentary
Quartz-veined Granite or Gneiss Pebble
Silicate-rich metamorphic rock fragment
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Jasper
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Basalt Pebble
Extrusive Igneous Rock
igneous
Greenstone Pebble
Metabasalt / Greenstone
metamorphic
Quartzite Pebble
Quartzite (Metamorphosed Sandstone)
metamorphic
Flint
SiO2 (Cryptocrystalline Quartz)
sedimentary
Flint / Chert Pebble
Cryptocrystalline quartz (SiO2)
sedimentary
Jasper / Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Basalt Pebble
Extrusive Igneous Rock
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Jasper and Quartz Pebble
Silicon Dioxide (SiO2) microcrystalline quartz variety
sedimentary
Agate
Silicon dioxide (Chalcedony), SiO2
gemstone
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Jasper Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Basalt Pebble
Extrusive Igneous Rock
igneous
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Limestone
Sedimentary rock composed mainly of calcite (CaCO3)
sedimentary
Limestone
Limestone (primarily composed of Calcium Carbonate, CaCO3)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite/Arkose)
sedimentary
Fossiliferous Flint / Chert
Microcrystalline quartz (SiO2) with embedded invertebrate fossils
sedimentary
Pink Quartz / Sea Glass
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Limestone
Calcium carbonate rock (CaCO3)
sedimentary
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Fossilized Oyster Shell
Gryphaea or Exogyra (Family Ostreidae)
fossil
Purpurite
Manganese Iron Phosphate, Mn3+(PO4)
mineral
Purple Conglomerate
Polymictic Conglomerate
sedimentary
Agate
Silicon Dioxide (SiO2) - Chalcedony variety
sedimentary