Aventurine (likely Green Aventurine)
Quartz (SiO2) with included minerals (Fuchsite or Chlorite for green color)
Category
Browse mixed: igneous and sedimentary specimens identified by the Rock Identifier community.
Aventurine (likely Green Aventurine)
Quartz (SiO2) with included minerals (Fuchsite or Chlorite for green color)
Chalcedony or Chert/Jasper with secondary mineral staining
SiO2 (for chalcedony/quartz) with possible secondary copper minerals (e.g., CuSiO3·nH2O for chrysocolla, Cu2(CO3)(OH)2 for malachite) or iron oxides/hydroxides.
Wishing Rock (Quartz Vein in Host Rock)
Silicon dioxide (SiO2) vein in various host rocks
Quartz / Quartzite Fragment
Silicon Dioxide (SiO2)
Opal
Hydrous silicon dioxide (SiO2·nH2O)
Golem
Megaton Pokémon (Lithos sapiens megalithos)
Calcite (or Alabaster, if truly carved)
Calcium Carbonate (CaCO3)
Lapis Lazuli (blue bead) and Moss Agate (green heart)
Lapis Lazuli (lazurite-based rock) and Moss Agate (SiO2 with manganese/iron inclusions)
Asphalt (Bituminous Concrete)
Asphaltum / Bitumen-Aggregate Matrix
Green Slag Glass (Cullet)
Amorphous Silica (Industrial Glass Byproduct)
Granitic Pegmatite Intrusion in Host Rock
Pegmatite dike in amphibolite or schist
Limonitic Gossan
Goethite/Limonite aggregate after sulfide
Obsidian and Phantom Quartz
Volcanic Glass (SiO2 + MgO + Fe3O4) and Crystalline Quartz (SiO2)
Mixed Gemstone Collection
SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)
Engineered Quartz Stone
Agglomerated Quartz (SiO2 + Polymer Resin)
Asphalt Concrete
Bituminous Concrete / Asphaltic Composite
Malachite with Chrysocolla
Copper carbonate hydroxide (Cu2CO3(OH)2) and Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O
Concrete / Anthropogenic Conglomerate
Man-made composite material (Portland cement, aggregate, and water)
Unakite
Epidotized Granite
Chrysocolla in Matrix
Chrysocolla (Cu,Al)2H2Si2O5(OH)4·nH2O
Costume Jewelry Gemstones (Emerald-imitation and semi-precious beads)
BeCuAl6Si6O18 (Beryl structure), frequently simulated by glass or synthetic spinel
Unakite
Unakite (Metasomatized Granodiorite)
Amethyst (Chevron or Banded Amethyst)
Silicon Dioxide (SiO2) with Fe3+ impurities
Lapis Lazuli
Lapis lazuli (complex rock composed of Lazurite, Calcite, and Pyrite)
Concrete Rubble with Aggregate
Hardened Portland Cement Paste with Coarse Aggregate
Unakite
Unakite (altered granite)
Silver (Sterling Silver Jewelry)
Argentum (Ag) mixed with Copper (Cu)
Biological Specimen (Domestic Dog)
Canis lupus familiaris
Rhodonite
Rhodonite (Mn,Fe,Mg,Ca)SiO3
Unakite
Unakite Epidosite (composite of Epidote, Orthoclase, and Quartz)
Unakite
Unakite (Epidotized Granite)
Chrysocolla in Matrix
Hydrated copper silicate - (Cu,Al)2H2Si2O5(OH)4·nH2O
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
Tiger's Eye / Hawk's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Gold and Silver (Metal Components of an Antique Pocket Watch)
Native Gold (Au) and Native Silver (Ag)
Ferruginous Slag (Iron Smelting Byproduct)
Fused Silicate Scoria (Amorphous mixture of FeO, SiO2, and CaO)
Unakite
Epidotized Granite
Unakite
Epidotized Granite
Chrysocolla on Matrix
Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4·nH2O
Lepidolite in Quartz
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 / SiO2
Unakite
Unakite (altered granite)
Unakite
Epidotized Granite