Pumice
Vesicular Rhyolite (highly vesicular igneous volcanic rock)
igneous
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
Vesicular Basalt (Iron-Stained)
Mafic Volcanic Rock (Basalt)
igneous
Vesicular Basalt (or Scoria)
Vesicular Basalt (Aphanitic-vesicular volcanic rock)
igneous
Rose Quartz
Rose Quartz (Silicon Dioxide, SiO2)
mineral
Scoria (Lava Rock)
Mafic extrusive volcanic rock (Scientific formula varies based on mineral content: primarily SiO2, MgO, and FeO)
igneous
Basalt with Vesicles
Vesicular Basalt (comprising Plagioclase Feldspar, Pyroxene, and Olivine)
igneous
Granodiorite
Granodiorite (containing Plagioclase, Quartz, and Biotite)
igneous
Stromatolite
Biogenic Sedimentary Rock (Lithified microbial mat)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gold Flakes in Oil (Novelty Specimen)
Native Gold (Au)
mineral
Belemnite (Fossilized Rostrum)
Belemnitida (Order), composed of Calcite (CaCO3)
sedimentary
Moonstone
Adularia (Potassium Aluminum Silicate, KAlSi3O8)
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Chakra Stone (Composite / Man-made Bonded Gemstones)
Composite of Quartz, Lapis Lazuli, Aventurine, Tiger's Eye, and Jasper (SiO2, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, etc.)
Combined Minerals / Metaphysical stones
Moonstone
Orthoclase (KAlSi3O8) with inclusions of Albite (NaAlSi3O8)
mineral
Vesicular Basalt (Aqueous Tumbled)
Scoriaceous Basalt
igneous
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
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
Quartzite
Quartzite (primarily SiO2)
metamorphic
River Cobble (likely Quartzite or Limestone)
SiO2 (Quartzite dominant) or CaCO3 (Limestone dominant)
metamorphic or sedimentary
Vesicular Basalt or Scoria
Basalt (extrusive volcanic rock)
igneous
Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Pumice
Pumiceous rhyolite / Volcanic glass
igneous
Dendritic Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with inclusions
mineral
Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Basalt with Calcite Veins
Basalt (Mafic Volcanic Rock)
igneous
Lava Rock (Scoria)
Extrusive basaltic scoria
igneous
Dendritic Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and clay inclusions
sedimentary
Pumice
Pumice (Vesicular volcanic glass / Rhyolite or Trachyte)
igneous
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Scoria (often called Lava Rock)
Vesicular Basalt / Scoria
igneous
Heat-Treated Citrine (Amethyst Cathedral with Agate inclusions)
Silicon Dioxide (SiO2) with iron impurities
mineral
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Diorite (Polished River Pebble)
Diorite (Intermediate intrusive igneous rock)
igneous
Green Quartzite (with Fuchsite)
Quartzite with Muscovite variety Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Red Jasper (Tumbled)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Moonstone
Orthoclase (Potassium Feldspar) - (K,Na)AlSi3O8
mineral
Quartz-veined Basalt
Amygdaloidal or Porphyritic Basalt with Silicon Dioxide (SiO2) vein
igneous