Limestone (Elephant Skin or Karst-weathered)
Calcium Carbonate (CaCO3)
sedimentary
Category
Not A Rock (Animated Character)
Browse not a rock (animated character) specimens identified by the Rock Identifier community.
Learn about Not A Rock (Animated Character) in the encyclopedia
View all →
Chert (Tan/Grey variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Oolitic Ironstone
Sedimentary Ooidal Ironstone (Limonite/Hematite mixture)
sedimentary
Feldspar (Orthoclase/Microcline)
Potassium Feldspar (KAlSi3O8)
mineral
Dyed and Metallic Coated Agate Geode
Silicon Dioxide (SiO2) with titanium/gold vapor deposition coating
sedimentary (primary) with artificial modification
Indigo Gabbro
Gabbro (Mafic Intrusive Rock)
igneous
Blue Quartz (Aventurine)
Silicon Dioxide (SiO2) with inclusions of crocidolite or dumortierite
mineral
Amazonite
Potassium aluminum silicate (KAlSi3O8)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert (specifically Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Geode (Cracked Open Fragment)
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Ca-rich Plagioclase, Pyroxene, and Olivine)
igneous
Anthracite Coal
Anthracite (Carbon-rich metamorphic sedimentary rock)
sedimentary
Amethyst (Quartz)
Amethyst (SiO2 with iron impurities)
mineral
Anthracite Coal
Anthracite (Carbon-based solid)
metamorphic
Amethyst (Rough Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Obsidian / Volcanic Glass
Obsidian (principally SiO2, usually 70% or more)
igneous
Amethyst (Variety of Quartz)
Silicon Dioxide (SiO2)
mineral
Auriferous Quartz (Gold-bearing Quartz)
Silicon Dioxide (SiO2) with Elemental Gold (Au)
mineral
Granite Cobble
Granitoid (typically containing Quartz SiO2, Feldspar KAlSi3O8, and Mica minerals)
igneous
Okenite (in Zeolite matrix)
Okenite (CaSi2O5 · 2H2O)
mineral
Lapis Lazuli
Complex mixture of minerals (lazurite, calcite, pyrite, and sodalite); (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Amethyst on Agate/Host Rock
Silicon Dioxide (SiO2) with iron impurities
mineral
Granite
Phaneritic Plutonic Rock (primarily Quartz, Feldspar, and Mica)
igneous
Granite Cobble
Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Granitic Gneiss
Gneiss (Complex silicate composition)
metamorphic
Sandstone (Ferruginous)
Arenite (Fe2O3 enriched)
sedimentary
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Granite
Phaneritic Plutonic Rock (High Silica content)
igneous
Pyrite in Quartz (Drill Core)
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions
igneous/metamorphic (hydrothermal)
Anthracite Coal
Anthracite (Carbon-rich metamorphic rock)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Ferruginous Sandstone (Gozzan-like)
Ferruginous Sandstone (SiO2 with FeO(OH) inclusions)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Sapphire (Blue)
Corundum (Al2O3)
mineral
Limonite (Iron Ore/Sandstone mixture)
Limonite (FeO(OH)·nH2O) often mixed with Goethite and sedimentary matrix
mineral
Serpentine
Serpentine-group (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Schist
Mica Schist (Medium-grade metamorphic rock)
metamorphic
Eclogite
Eclogite (Omphacite-Garnet rock)
metamorphic
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral