Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Not A Rock (Animated Character)
Browse not a rock (animated character) specimens identified by the Rock Identifier community.
Pink Granite
Granite (rich in Potassium Feldspar/Orthoclase)
igneous
Labradorite (a variety of Anorthosite or Plagioclase)
Labradorite (member of Plagioclase Feldspar series), (Ca,Na)(Al,Si)4O8
igneous
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Basalt with Amygdules
Amygdaloidal Basalt
igneous
Amethyst
Amethyst (Silicon Dioxide with Iron impurities), SiO2
mineral
Amethyst
Quartz (Silicon Dioxide, SiO2) with iron impurities
mineral
Chrome Diopside
Magnesium Calcium Silicate (MgCaSi2O6) containing Chromium impurities
mineral
Amethyst
SiO2 (Silicon Dioxide) - Purple variety of Crystalline Quartz
mineral
Amethyst
Amethyst (Purple Quartz); formula: SiO2 (Silicon Dioxide)
mineral
Moss Agate
Chalcedony (SiO2) with dendritic inclusions of Manganese or Iron oxide
mineral
Sandstone (likely Fossiliferous)
Arenite / Sedimentum arenaceum
sedimentary
Rhodonite
Rhodonite (Mn,Fe,Mg,Ca)SiO3
mineral
Red Jasper (Quartz)
Silicon Dioxide (SiO2) with Iron impurities
sedimentary
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Garnet (likely Almandine or Pyrope)
Garnet Group, Nesosilicates (Complex chemistry, e.g., Almandine: Fe3Al2Si3O12)
mineral
Greenstone (Greenstone River Pebble)
Greenschist (metamorphosed mafic igneous rock)
metamorphic
Banded Agate (specifically Black Sardonyx/Onyx variety)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Carnelian (Chalcedony)
Silicon Dioxide (SiO2) with trace Iron Oxide
mineral
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral
Milky Quartz (Druzy Geode fragment)
Silicon Dioxide (SiO2)
mineral
Basalt River Pebble
Aphanitic Mafic Basalt
igneous
Travertine
Terrestrial Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Banded Gneiss (with Quartz Vein)
Gneiss (Metamorphic rock of varying mineralogy)
metamorphic
Schist
Mica Schist
metamorphic
Siltstone
Siltstone (primarily SiO2 with Al2O3)
sedimentary
Tiger's Eye (Unpolished)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Schist (Micaceous Schist)
Schist (containing mainly Muscovite and Quartz)
metamorphic
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Quartz on Schist
Silicon Dioxide (SiO2) on Foliated Metamorphic Rock
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Snowflake Obsidian
Vitreous volcanic silicate rock (SiO2) with Spherulite inclusions
igneous
Red Jasper
Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)
Mineral (variety of Chalcedony/Quartz)
Limonite (Bog Iron)
Limonite (Hydrated iron(III) oxide-hydroxide) - FeO(OH)·nH2O
mineral
Marble
Recrystallized Calcite (CaCO3) Rock
metamorphic
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Basalt with Epidote (Greenstone)
Epidote-bearing Metabasalt
metamorphic
Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Granite (Pegmatitic)
Phaneritic Felsic Igneous Rock
igneous
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous