Kimberlite
Kimberlite (Potassic ultramafic volcanic rock)
igneous
Category
Organic (Paper And Cellulose)
Browse organic (paper and cellulose) specimens identified by the Rock Identifier community.
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Sandstone with Concretions / Liesegang Rings
Arenite with iron oxide banding
sedimentary
Iron Meteorite
Iron Meteorite (primarily Kamacite and Taenite, Fe-Ni alloys)
mineral
Carnelian
SiO2 (Silicon Dioxide) - Carnelian Agate/Chalcedony
mineral
River Rock (Basalt/Greywacke)
Aphanitic Basalt or Lithic Sandstone (Greywacke)
igneous
Almandine Garnet in Schist
Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist
metamorphic
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineral
Opal
Hydrated Silica (SiO2·nH2O)
mineral
Aventurine (Green)
Silicon Dioxide (Quartz with inclusions of Fuchsite)
metamorphic
Granite (Weathered)
Grano-diorite / Granite (SiO2 rich intrusive rock)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Quartz with inclusions (likely Tourmaline or Biotite)
Silicon Dioxide (SiO2)
mineral
Jasper Marble
Silicon Dioxide (SiO2) with Impurities
sedimentary
Jasper (Iron-stained)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Gabbro (Water-Worn Cobble)
Gabbro
igneous
Green Adventurine
SiO2 (Silicon Dioxide with inclusions of Fuchsite mica)
mineral
Gold Nugget
Native Gold (Au)
mineral
Jasper pebble
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary (secondary classification: cryptocrystalline quartz)
Sandstone (Ferruginous)
Arenite with Iron-oxide inclusions (SiO2 primarily)
sedimentary
Bronzite
Enstatite (var. Bronzite), (Mg,Fe)SiO3
mineral
Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Polished Jasper (Mushroom Carving)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Amethyst or Smoky Quartz Geode Slice
Crystalline Silicon Dioxide (SiO2) with iron impurities
mineral
Polished Rhodonite Obelisk
Rhodonite (Manganese Iron Magnesium Calcium Silicate) - (Mn,Fe,Mg,Ca)SiO3
metamorphic
Turquoise color-bead and Hematite necklace
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)
mineral
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
igneous
Gold Nugget
Native Gold (Au)
mineral
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Hematite Nodules (Moqui Marbles style)
Iron Oxide (Fe2O3)
mineral
Chalcopyrite
Chalcopyrite (CuFeS2)
mineral
Bauxite
Bauxite (mixture of hydrous aluminum oxides: Al(OH)3 & AlO(OH))
sedimentary
Quartz Vein with Host Rock (Greywacke/Siltstone)
Silicon Dioxide (SiO2) within Clastic Sedimentary/Metamorphic Matrix
metamorphic
Granite or Granodiorite (Weathered)
Granite
Igneous
Libyan Desert Glass
Impactite (vitreous silica), SiO2
mineral
Milky Quartz with Chlorite/Mica inclusions
Silicon Dioxide (SiO2) with inclusions
mineral
Red Jasper
Silicon Dioxide (SiO2) - variety Jasper
mineral
Iron Slag
Anthropogenic Iron Silicate
industrial byproduct