Basalt
Extrusive mafic igneous rock
igneous
Category
Not A Rock (Man Made Polymer)
Browse not a rock (man made polymer) specimens identified by the Rock Identifier community.
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz Vein on Matrix
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Pink Feldspar
Orthoclase Feldspar (KAlSi3O8)
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Basalt (Water-worn Pebble)
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Sandstone (likely Greywacke variant)
Arenite
sedimentary
Dalmatian Stone
Peralkaline Quartz-Feldspar Rock
igneous
Sandstone (with Concretion)
Arenite / Quartzose Sandstone
sedimentary
Sandstone (Quartzose)
Arenite (composed mainly of SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Peridot in Basalt
Olivine ((Mg, Fe)2SiO4) in Basalt
mineral
Unakite
Epidotized Granite
metamorphic
Sandstone
Arenite (SiO2 based with primary clasts 0.0625 to 2 mm)
sedimentary
Schist
Mica Schist (primarily consisting of muscovite KAl2(AlSi3O10)(OH)2 or biotite K(Mg,Fe)3(AlSi3O10)(OH)2)
metamorphic
Wishing Stone (Basalt/Greywacke with Quartz Vein)
Basalt or Siltstone with SiO2 (Quartz) hydrothermal intrusion
igneous/sedimentary
Serpentine
Serpentine-group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4)
metamorphic
Quartz Geode
Silicon Dioxide (SiO2) in Host Rock
sedimentary
Basalt Pebble
Basalt (Mafic volcanic rock)
Igneous
Dalmation Jasper (Dalmation Stone)
Perthitic feldspar-quartz-amphibole rock
igneous
Unakite
Epidotized Granite
metamorphic
Quartz (chalcedony variety) or Limestone with Quartz Veins
SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)
Mineral or Sedimentary Rock (with mineral inclusions)
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Scoria (Lava Rock)
Scoria (extrusive volcanic rock)
igneous
Diorite (River Rock)
Intermediate plutonic igneous rock
igneous
Scoria (Lava Rock)
Scoria (Mafic volcanic rock)
igneous
Ammonite Fossil in Limestone Matrix
Ammonoidea (subclass) in Calcium Carbonate (CaCO3)
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Shale or Argillite
Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)
Sedimentary or Metamorphic (low grade)
Sandstone
Arenite (primarily SiO2)
sedimentary
Unakite
Epidotized Granite
metamorphic
Unakite
Epidotized Granite
metamorphic
Unakite
Unakite (Epidotized Granite)
metamorphic
Unakite
Unakite (Epidotized Granite)
metamorphic
Basalt
Basalt (containing Pyroxene, Plagioclase feldspar, and Olivine)
igneous
Unakite
Epidotized Granite (SiO2 with Ca2(Al, Fe)3(SiO4)3(OH))
metamorphic