Scoria (Lava Rock)
Scoria (vesicular mafic igneous rock)
igneous
Category
Synthetic Material (Not A Rock Or Mineral)
Browse synthetic material (not a rock or mineral) specimens identified by the Rock Identifier community.
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Weathered sandstone or iron-stained sedimentary rock
Quartz-rich sandstone, possibly ferruginous sandstone
sedimentary
Hematitic Sandstone
Sandstone with Iron Oxide (Hematite) staining
sedimentary
Sandstone
Sandstone (composed primarily of sand-sized minerals or rock grains)
sedimentary
Tiffany Stone
Fluorite-bearing Opalized Breccia
Rock/Mineralized Nodule
Petrified Wood (Jet or Coalified Wood appearance)
Silicified wood (principally SiO2) or Carbonized Wood
sedimentary
Ironstone with Limonite/Goethite coating
Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O)
sedimentary
Ammonite Fossil (Iridiscent)
Ammonoidea (subclass)
fossil
Chert (or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Basalt River Stone
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Basalt with Plagioclase Phenocrysts
Porphyritic Basalt
igneous
Greenstone (Greenschist)
Greenschist facies rock (containing chlorite, epidote, actinolite)
metamorphic
Banded Calcite (Cave Onyx)
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Pebble/Conglomerate fragment)
Sandstone (clastic sedimentary rock)
Sedimentary Rock
Native American Hammerstone / Pitted Stone
Modified lithic artifact (often quartzite, basalt, or granite)
artifact / sedimentary or igneous rock
Dalmatian jasper
Dalmatian stone, typically a leucocratic alkali-feldspar-rich porphyritic igneous rock with black arfvedsonite or aegirine inclusions
igneous
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Jasper / Chert (River Pebble)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
River Quartzite (River Rock)
Quartzite (SiO2)
metamorphic
Milky Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Porphyritic granite (likely weathered granitic rock)
Granite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende
igneous
Quartz
Silicon Dioxide (SiO2)
Mineral
Chert (Flint nodule)
Silicon dioxide (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Porphyritic Basalt (Chinese Writing Stone or Flower Stone)
Porphyritic Basalt / Porphyry
igneous
Limestone (likely weathered)
Limestone (Mainly Calcium Carbonate, CaCO3)
sedimentary
Basalt
Africite (Mafic Igneous Rock)
igneous
Basalt
Extrusive mafic igneous rock
igneous
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Clear quartz crystal
Quartz (silicon dioxide, SiO₂)
mineral
Carnelian
Quartz (Silicon Dioxide, SiO2)
gemstone
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Diorite (Salt and Pepper Rock)
Diorite
igneous
Serpentine
Antigorite-Lizardite-Chrysotile (Mg3Si2O5(OH)4)
metamorphic
Iron-rich chert or jasper
Microcrystalline quartz (SiO₂), colored by hematite/goethite inclusions
sedimentary
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Petrified Wood
Silicified Wood / Fossilized Wood (SiO2)
sedimentary
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Puddingstone
Conglomerate
Sedimentary