Travertine
Travertine (CaCO3)
sedimentary
Category
Rock
Browse rock specimens identified by the Rock Identifier community.
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Ocean Jasper or Orbicular Jasper
SiO2
mineral
Sandstone
Arenite
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Coral Fossil (Favosites type)
Phylum Cnidaria, Class Anthozoa (often CaCO3 - Calcium Carbonate)
sedimentary
Tiger Diamond / Hematite-infused Quartzite
Silicified Hematite-Rich Quartzite (SiO2 + Fe2O3)
metamorphic
Gold Ore in Quartz/Schist
Auriferous Quartz and Sulfide-bearing Schist
Metamorphic/Igneous (Hydrothermal)
Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, primarily FeO(OH)·nH2O)
mineral
Rhyolite
Rhyolite (felsic extrusive igneous rock)
igneous
Peridotite
Peridotite (composed largely of Olivine and Pyroxene)
igneous
Gneiss
Gneiss
metamorphic
Basalt
Basalt (Vitreous to Aphanitic Mafic Igneous Rock)
igneous
Quartz Druse on Basalt Matrix
Silicon Dioxide (SiO2)
mineral
Druzy Quartz on Matrix (Chert/Limestone)
Silicon Dioxide (SiO2) with Carbonate host rock
sedimentary
Basalt River Pebble (with Quartz Vein)
Basalt (Mafic Volcanic Rock)
igneous
River Cobble (likely Basalt or Mafic Igneous Rock)
Extrusive Mafic Igneous Rock (e.g., Basalt)
igneous
Basalt Pebble
Basalt (Mafic volcanic rock)
igneous
Basalt River Cobble
Basalt (Composition primarily Plagioclase Feldspar and Pyroxene)
igneous
Pumice
Pumice (Vesicular Rhyolite/Andesite)
igneous
Unakite
Unakite (Epidotized Granite)
metamorphic
Druzy Quartz Geode (likely Smokey Quartz variety)
Silicon Dioxide (SiO2) - specifically a geode formation lined with druzy quartz crystals, with a likely brownish hue indicating smokey quartz.
Mineral structure/Rock
Gravel and Sediment Sample
Mixed clastic sediment
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
sedimentary
Smoky Quartz on Feldspar (Granite Pegmatite)
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)
igneous
Granite River Cobble
Phaneritic Felsic Igneous Rock
igneous
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Basalt
Extrusive Igneous Rock
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Basalt Pebble
Extrusive Igneous Rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Argillite / Mudstone
Argillaceous sedimentary rock
sedimentary
Pumice
Pumice (Volcanic Rock)
igneous
Basalt
Extrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Porphyry
Porphyritic Igneous Rock
igneous
Porphyry (specifically Porphyritic Andesite / Rhyolite)
Porphyritic Igneous Rock
igneous
Pumice (or Volcanic Tuff / Ash)
Pumice / Pyroclastic rock
igneous