Granite with Hematite staining
Granitoid (Quartz, Feldspar, Mica) with Iron Oxide (Fe2O3)
igneous
Category
Rock
Browse rock specimens identified by the Rock Identifier community.
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained or Rose variant)
Silicon Dioxide (SiO2)
mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Terrazzo (Man-made Composite)
Cementitious or Resin-bound Lithic Composite
sedimentary (artificial)
Chert (Flint Pebbles)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert (Jasper/Mudstone variant)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (with Iron Siderite Concretion)
Arenite with Ironstone Concretion (FeCO3)
sedimentary
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Desert Rose
Gypsum (variety Selenite) or Barite, CaSO4·2H2O
mineral
Chert (Chalcedony/Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (White Chert)
Silicon Dioxide (SiO2)
sedimentary
Conglomerate
Conglomerate
sedimentary
Gneiss (River Cobble)
Metamorphic Gneiss
metamorphic
Pink Granite
Granite (Phaneritic igneous rock)
igneous
Granite
Felsic intrusive igneous rock
igneous
Pink Granite
Granite (Felsic Plutonic Rock)
igneous
Granite
Phaneritic Igneous Rock (Granite)
igneous
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Scoria (Lava Rock)
Scoria (extrusive volcanic rock)
igneous
Scoria (Lava Rock)
Scoria (extrusive volcanic rock)
igneous
Scoria (Lava Rock)
Scoria (extrusive volcanic rock)
igneous
Diorite (River Rock)
Intermediate plutonic igneous rock
igneous
Scoria (Lava Rock)
Scoria (Mafic volcanic rock)
igneous
Mantle Xenolith in Basalt
Peridotite Xenolith in Basalt
igneous
Basalt with Quartz/Feldspar Vein
Mafic Volcanic Rock (Basalt) with SiO2 hydrothermal vein
igneous
Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite
Granite (Felsic Plutonic Rock)
Igneous
Sandstone (Pebble/Cobble)
Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)
Sedimentary
Basalt River Cobble
Vitreous aphanitic Basalt
igneous
Basalt
Basalt
igneous
Peridot in Basalt
Olivine ((Mg, Fe)2SiO4) in Basalt
mineral
Mica Schist
Schist (biotite/muscovite schist)
metamorphic
Banded Gneiss
Gneiss (Felsic to Mafic Metamorphic Rock)
metamorphic
Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Vesicular Basalt (Scoria)
Basalt with vesicular texture
igneous
Basalt Scoria
Aphanitic Vesicular Basalt
igneous
Sandstone (Ferruginous)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Chert (or Flint)
Chert (cryptocrystalline quartz), SiO2
Sedimentary