Basalt
Extrusive Mafic Igneous Rock (composed primarily of Plagioclase and Pyroxene)
igneous
Category
Synthetic Polymer (Synthetic Material)
Browse synthetic polymer (synthetic material) specimens identified by the Rock Identifier community.
Quartzite with Dark Mineral Inclusions
Quartzite (primarily SiO2) with accessory minerals
metamorphic
Sandstone (Ferruginous)
Arenite (variable SiO2 with Fe2O3 staining)
sedimentary
Olivine (Peridotite)
Magnesium Iron Silicate - (Mg, Fe)2SiO4
igneous
Granite
Phaneritic intrusive igneous rock (consisting mainly of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Quartz / Quartzite
Quartz (Silicon Dioxide, SiO2)
metamorphic
Sandstone (Pebble)
Arenite (primarily SiO2)
sedimentary
Siltstone/Sandstone (possibly Wonderstone or Picture Sandstone)
Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide inclusions)
Sedimentary
Sandstone (Quartz-rich Pebble)
Arenite (primarily SiO2)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Sandstone (Weathered Pebble)
Arenite (primarily SiO2)
sedimentary
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Indigo Gabbro
Gabbro (Mafic Intrusive Rock)
igneous
Chert (specifically Gray/Tan Chert Node)
Microcrystalline Quartz (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Yellow Quartzite
Quartzite (SiO2)
metamorphic
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Phaneritic Igneous Rock (composed primarily of Quartz SiO2, Alkali Feldspar (K,Na)AlSi3O8, and Plagioclase Feldspar)
igneous
Sandstone
Arenite (primarily SiO2 - Silicon Dioxide)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz (specifically Milky or Clear Chunk)
Silicon Dioxide (SiO2)
mineral
Chert (specifically River Stone / Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Basalt
Extrusive mafic igneous rock
igneous
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary
Basalt River Stone
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Mica Schist
Schist (Muscovite/Biotite Schist)
metamorphic
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Diorite (Salt and Pepper Rock)
Phaneritic plutonic igneous rock (sodium-rich plagioclase feldspar and hornblende)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Green Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Brecciated Jasper
Silicon Dioxide (SiO2) with varying mineral inclusions (Iron Oxide, Hematite, Clay)
sedimentary (clastic/chemical)
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossilized Wood (with Coal and Limonite)
Petrified Wood (Silicified or Carbonized Flora)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood (Agatized/Silicified Wood)
Silicified Wood / Chalcedony (SiO2)
sedimentary
Jasper
Jasper (Silica-rich microcrystalline Quartz, SiO2 with Fe2O3 impurities)
sedimentary