Pink-and-white quartz-rich pebble
Quartz (SiO₂), likely massive quartz with iron-oxide staining and possible feldspar inclusions
mineral
Category
Rock
Browse rock specimens identified by the Rock Identifier community.
Tumbled orange-and-white chalcedony/agate
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony or carnelian-bearing agate
mineral
Amethyst
Silicon Dioxide (SiO2) with Iron impurities
mineral
Banded Sandstone
Arenite with Liesegang banding (primarily SiO2 with FeO(OH) impurities)
sedimentary
Chert (Arrowhead)
Chert (primarily Microcrystalline Silica, SiO2)
sedimentary
Quartz geode
Microcrystalline and crystalline quartz, SiO₂, likely with chalcedony and iron-oxide staining
mineral
Milky Quartz with Country Rock contact
Silicon Dioxide (SiO2) in contact with Metamorphic/Igneous rock
mineral
Rounded gray river pebble
Likely quartz-rich metamorphic or igneous pebble; exact identification requires testing
sedimentary
Shale
Argillaceous sedimentary rock
sedimentary
Turquoise cabochon pendant
Turquoise, hydrated copper aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in Geodic habit
mineral
Gabbro or Diorite with Quartz/Epidote Vein
Intrusive Igneous Rock (Plutonic)
igneous
Flint or chert
Microcrystalline quartz (SiO₂), commonly chalcedony with possible impurities
sedimentary
Quartz Geode with Calcite
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)
mineral
Yellow Quartzite
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Basalt
Extrusive mafic igneous rock
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Peridotite (Pyroxenite/Serpentinized Dunite)
Ultramafic Rock (consisting primarily of Olivine and Pyroxene)
igneous
Puddingstone (Gowganda Tillite/Jasper Conglomerate)
Jasper Conglomerate (SiO2 primary composition)
sedimentary
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Basalt with Quartz/Calcite Veining
Basalt (principally Plagioclase and Pyroxene)
igneous
Greenstone / Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4
metamorphic
Assorted Beach Rocks and Pebbles
Various (Granite, Basalt, Quartz, Conglomerate, etc.)
igneous, sedimentary, metamorphic
Unidentifiable Rock Fragment
Uncertain
Shale (sub-type: Carbonaceous Shale)
Lutaceous Sedimentary Rock
sedimentary
Unknown Rock
Unknown
rock
Chert (Iron-Stained)
Microcrystalline Silica (SiO2)
sedimentary
Schist
Mica Schist (Medium-grade Metamorphic Rock)
Metamorphic
Quartz Druzy
Crystalline Silicon Dioxide (SiO2)
mineral
Weathered granite or granitic gneiss fragment
Granite; predominantly quartz, feldspar, and mica (exact identification requires testing)
igneous
Milky quartz vein rock
Quartz (SiO₂), likely in a quartz-rich host rock with minor iron-stained minerals
mineral
Vesicular Basalt (Scoria)
Basalt (Vesicular texture)
igneous
Quartz vein fragment
Quartz (SiO₂), likely milky quartz with iron-oxide staining
mineral
Conglomerate (with Jasper pebble)
Conglomerate / Microcrystalline Quartz (Jasper)
sedimentary
Basalt
Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)
igneous
Agate
Silicon dioxide (Chalcedony), SiO2
gemstone
Asphalt Pavement (with aggregate)
Asphalt concrete
man-made composite
Basalt
Aphanitic Mafic Igneous Rock
igneous
Basalt
Basalt
igneous
Vesicular Basalt River Rock
Vesicular Basalt
igneous
Shale
Sedimentary pelitic rock
sedimentary