Chromium (Chrome)
Chromium (Cr)
mineral
Category
Igneous Or Sedimentary (Anthropogenic Modification)
Browse igneous or sedimentary (anthropogenic modification) specimens identified by the Rock Identifier community.
Green Aventurine
Aventurine (Silicon dioxide, SiO₂)
Mineral; variety of Quartz
Calcite
Calcite (Mineral, Calcium Carbonate - CaCO3)
Mineral
Granite Gneiss
Gneiss (derived from granitic protolith)
metamorphic
Orange Calcite
Calcite (CaCO3)
Mineral
Red Jasper
Silicon Dioxide (SiO2) with Iron impurities
mineral
Fossiliferous Limestone with Brachiopod
Phylum Brachiopoda in calcitic matrix
sedimentary
Sea Glass (Teal/Turquoise)
Amorphous Silica (SiO2) with trace metal oxides
Anthropogenic (Man-made material processed by nature)
Slag Glass
Amorphous Silica / Glass Slag
industrial byproduct (anthropogenic rock-like material)
Sea Glass (Turquoise/Aqua)
Amorphous Silica (SiO2) with transition metal dopants
Anthropogenic (Man-made material processed by nature)
Granite
Intrusive igneous felsic rock
igneous
Sandstone (with ripple marks)
Arenite / Quartz Sandstone
sedimentary
Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Granite
Phaneritic Plutonic Felsic Rock
igneous
Amazonite
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Biotite on Matrix
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
mineral
Rose Quartz
Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Labradorite
Labradorite (Ca,Na)(Al,Si)4O8
mineral
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
mineral
Granite
Granite (a plutonic igneous rock composed primarily of quartz, feldspar, and mica)
igneous
Magnetic Hematite
Magnetized Hematite (an iron oxide mineral, Fe2O3, that has undergone magnetization)
Mineral
Knightia Fossil in Limestone
Knightia eocaena in micritic limestone
sedimentary
Dyed Dalmatian Jasper (Dalmatian Stone)
Perthitic Feldspar with Arfvedsonite inclusions
igneous
Dalmatian Stone
Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)
igneous
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains, primarily SiO2)
sedimentary
Snowflake Obsidian
Spherulitic Volcanic Glass (SiO2 + impurities)
igneous
Indigo Gabbro (also known as Mystic Merlinite)
Gabbro (composed of Plagioclase Feldspar, Pyroxene, and minor Magnetite/Ilmenite)
igneous
Garnet Rhyolite
Rhyolite (high-silica volcanic rock) with almandine/spessartine garnet
igneous
Granite
Granite (Mainly Quartz, Feldspar, and Mica)
igneous
Chert (Agatized/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
Snowflake Obsidian
Volcanic glass containing Spherulitic Cristobalite (SiO2)
igneous
Granite
Granitoid
igneous
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)
igneous
Granite
Intrusive Igneous Rock (composed primarily of Quartz: SiO2, Feldspar: KAlSi3O8, and Mica: KAl2(AlSi3O10)(OH)2)
igneous
Granite
Granite (Phaneritic igneous rock composed of Quartz, Feldspar, and Mica)
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Granite
Granite
igneous
Mica-rich Pegmatite
Pegmatite (rich in Muscovite and Biotite)
igneous
Sodalite
Sodalite: Na8(Al6Si6O24)Cl2
mineral
Granite
Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Bull Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral