Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
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Banded calcite (onyx marble)
Calcite, CaCO₃; commonly sold as “honey onyx” or “Pakistan onyx”
mineral
Green Onyx (Carved Mushroom)
Calcite / Banded Calcite (often commercially sold as 'Mexican Onyx')
sedimentary
Granite Cobble
Intrusive Igneous Rock (Felsic to Intermediate)
igneous
Lava Rock (Dyed)
Basalt / Volcanic scoria
igneous
Granite
Intrusive Igneous Rock
igneous
Quartz-veined Basalt or Diabase Pebble
Igneous rock with hydrothermal quartz vein
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt
Extrusive mafic igneous rock (Basalt with vesicular texture)
igneous
Moonstone
Potassium aluminum silicate (KAlSi3O8)
gemstone
Scoria (Lava Rock)
Scoria
igneous
Scoria
Highly vesicular mafic volcanic rock
igneous
Moss Agate and Druzy Quartz Carving
Cryptocrystalline Silica (SiO2) with impurities
mineral
Vesicular Basalt
Basalt with vesicular texture
igneous
Scoria (Lava Rock)
Scoria (extrusive volcanic rock)
igneous
Scoria
Extrusive Basaltic Scoria
igneous
Scoria
Vesicular Basalt / Scoria (Mafic silicate rock)
Igneous
Pumice
Pumice (a highly vesicular felsic volcanic rock)
igneous
Scoria (Lava Rock)
Scoria (Vesicular Basaltic Glass/Rock)
igneous
Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Vesicular Basalt (Scoria)
Vesicular Basalt
igneous
Agate (Thunderegg)
Silicon dioxide (SiO2)
mineral
Basalt with Vesicle/Vug
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Limonite inclusions
sedimentary
Sunstone
Oligoclase (Plagioclase Feldspar) - (Na,Ca)(Si,Al)4O8 with Hematite or Copper inclusions
mineral
Pumice
Pumicite / Vesicular Rhyolite
igneous
Vesicular Basalt (Scoria)
Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Vesicular Rhyolite
Rhyolite (High-silica volcanic rock)
igneous
Polished Picasso jasper
Silicified carbonate rock, commonly marketed as Picasso jasper; composition varies and is not a single mineral species
metamorphic
Howlite (tumbled stone)
Howlite, Ca₂B₅SiO₉(OH)₅
mineral
Green Quartzite
Metamorphic Quartzite (with Fuchsite inclusion, SiO2)
metamorphic
Boji Stone (Pop Rocks or Moqui Marbles)
Iron-manganese oxide concretion (Goethite/Hematite/Jarosite)
sedimentary
Cubic Zirconia (Jewelry Setting)
Zirconium Dioxide (ZrO2)
gemstone
Pet Rock (Man-made Quartzite or Granite Cobble)
Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica
igneous or metamorphic (base stone); anthropogenic (decoration)
Banded Chert
Cryptocrystalline Quartz (SiO2)
sedimentary
Lapidary Wax (imitation/wax model)
Hydrocarbon wax blend with colorant (imitating Lapis Lazuli/Emerald)
mineral
Fossilized Gastropod Shell
Gastropoda (Class) replacement / internal cast (steinkern)
fossil
Moonstone
Orthoclase (KAlSi3O8) with Albite (NaAlSi3O8) intergrowths
mineral
Amygdaloidal Basalt
Basalt with secondary amygdule minerals (likely Epidote or Chlorite)
igneous
Rhinestone
Artificial Glass/Crystal
gemstone