Chert (Quartz Variety)
Microcrystalline Silica (SiO2)
sedimentary
Category
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Browse this image does not display a rock, mineral, or geological specimen. it shows a human hand wearing a ring. specimens identified by the Rock Identifier community.
Quartzite with Iron Staining
Silicon Dioxide (SiO2) with Fe2O3 impurities
metamorphic
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Green Jasper (Agate-Jasper mixture)
Silicon Dioxide (SiO2) with impurities
sedimentary
Quartz in Limonite-rich Matrix
Silicon Dioxide (SiO2) with Goethite/Limonite FeO(OH)·nH2O
Mineral in Sedimentary/Secondary host
Granitic Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Greenstone / Diabase Porphyry
Porphyritic Diabase (Micro-gabbro)
Igneous
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Anthracite Coal
Anthracite (Carbon-based metamorphic rock, 86-97% C)
metamorphic
Basalt River Rock
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Basalt River Cobble
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Mica Schist
Crystalline Schist (often primarily Muscovite or Biotite sheet silicates)
metamorphic
Greenstone / Serpentinite
Serpentinite (composed primarily of minerals from the serpentine group Mg3Si2O5(OH)4)
metamorphic
Magnetic Hematite
Magnetized Hematite (an iron oxide mineral, Fe2O3, that has undergone magnetization)
Mineral
Pink Granite (with Potassic Feldspar and Quartz)
Felsic Intrusive Igneous Rock (Granite)
igneous
Green Glass Slag
Amorphous Silicon Dioxide (SiO2) with metal oxide impurities
mineraloid (man-made)
Rough Corundum (likely Sapphire/Zircon-bearing)
Aluminium Oxide (Al2O3)
mineral
Quartzite (River Stone)
Quartzite (composed primarily of Silicon Dioxide, SiO2)
metamorphic
Basalt
Basalt (Mafic Extrusive)
igneous
Pyrite
Iron Sulfide (FeS2)
mineral
Quartzite (Yellow/Iron-Stained)
Quartzite (SiO2 with Iron Oxide impurities)
metamorphic
Green Sandstone
Glauconitic Sandstone
sedimentary
Vesicular Basalt or Scoria
Basalt (extrusive volcanic rock)
igneous
Pyrite with Limonite/Goethite Alteration (Pseudomorph)
Iron Sulfide (FeS2) transitioning to Hydrated Iron Oxides (FeO(OH)·nH2O)
mineral
Yellow Ocher (Limonite)
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Schist
Mica Schist (primarily consisting of muscovite KAl2(AlSi3O10)(OH)2 or biotite K(Mg,Fe)3(AlSi3O10)(OH)2)
metamorphic
Diamond
Cubic Carbon (C)
mineral
Tiger's Eye (with Blue Tiger's Eye / Hawk's Eye)
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)
metamorphic
Barite
Barium Sulfate (BaSO4)
mineral
Sea Glass (Kelly Green)
Amorphous Silica (Silicon Dioxide with Iron/Chromium additives)
Anthropogenic specimen (Man-made material)
Quartzite Pebble (with Quartz veins)
Quartzite (SiO2)
metamorphic
Diorite
Diorite (intermediate intrusive igneous rock)
igneous
Turquoise (Rough Specimens)
Hydrous phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O
mineral
Diorite
Phaneritic Intrusive Igneous Rock (Intermediate Composition)
igneous
Zebra Rock / Zebra Marble
Banded Limestone-Marble Transition
metamorphic
Granite
Granite
igneous
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Quartzite Pebbles
Quartzite (SiO2 silicon dioxide dominant)
metamorphic
Green Aventurine
Silicon Dioxide (Quartz) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Slag Glass (Cullet)
Amorphous Silica / Glass residue
Man-made byproduct (Non-geological)
Andesite
Andesite (Intermediate Extrusive Volcanic Rock)
igneous
Blue Chalcedony (Tumbled)
Silicon Dioxide (SiO2)
mineral