Basalt
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Category
Not A Rock (Man Made Polymer)
Browse not a rock (man made polymer) specimens identified by the Rock Identifier community.
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Basalt (Vesicular)
Extrusive mafic igneous rock; primarily (Ca, Na)(Mg, Fe, Al)(Si, Al)2O6 with (Ca, Na)(Al, Si)4O8
igneous
Amethyst (Geode/Druzy)
Silicon Dioxide (SiO2) with iron impurities
mineral
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Ocean Jasper
Spherulitic Chalcedony (SiO2)
mineral
River Pebbles (Tumbled Quartz and Basalt)
Silicon Dioxide (SiO2) for white quartz; Mafic Volcanic Rock for basalt
igneous and sedimentary
Sandstone (Ferruginous)
Arenite (with high iron oxide content)
sedimentary
Quartzite with Quartz Vein
Metamorphosed sandstone (SiO2)
metamorphic
Garnet Schist
Garnet-bearing Mica Schist (variety of compositions, often Al2SiO5 with X3Y2(SiO4)3)
metamorphic
Ferruginous Sandstone (Ironstone)
Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Basalt
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Basalt with Scoria/Vesicular texture
Vesicular Basalt (primarily Plagioclase feldspar, Pyroxene, and Olivine)
igneous
Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Sandstone (with carbonaceous plant fragments)
Arenite (composed primarily of SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Amethyst (Tumbled)
Amethyst (Silicon Dioxide, SiO2 + Fe4+)
mineral
Sandstone Concretion
Ferruginous Sandstone Concretion
sedimentary
Milky Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
Mineral
Yellow Ochre / Limonite
Limonite (FeO(OH)·nH2O)
Mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Ca-rich Plagioclase, Pyroxene, and Olivine)
igneous
Red Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert (specifically Pink/Tan Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Emerald in Matrix
Beryl (Be3Al2Si6O18) with trace amounts of Chromium/Vanadium
mineral
Ammonite Fossil
Ammonoidea (subclass)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert Nodule
Microcrystalline Silica (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt with Quartz/Calcite Inclusions
Amygdaloidal Basalt (SiO2 / CaCO3 inclusions)
igneous
Ruby in Zoisite (Anyolite)
Corundum var. Ruby in Zoisite (Al2O3 + (Ca2Al3(SiO4)3(OH)))
metamorphic
Sandstone Concretion
Moqui Marble / Iron-oxide Concretion (SiO2 with Hematite/Goethite)
sedimentary
Grooved Maun Ball (Maul/Hammerstone-like Concretion)
Calcareous/Ferruginous Concretion in Sandstone Matrix
sedimentary
Chert (Arrowhead or Projectile Point)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Basalt
Mafic Volcanic Rock (Primarily Plagioclase feldspar and Pyroxene)
Igneous
Slate
Slate (Foliated Metamorphic Rock)
metamorphic
Gabbro
Gabbro (Mafic Plutonic Rock)
igneous
Granite
Phaneritic Plutonic Felsic Rock
igneous
Pink Granite
Granite (Phaneritic igneous rock)
igneous