Clay Brick
Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)
metamorphic (man-made/anthropogenic)
Category
Mineral (Man Modified)
Browse mineral (man modified) specimens identified by the Rock Identifier community.
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Goldstone (Synthetic Aventurescence Glass)
Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)
mineraloid / man-made material
Fired Clay Brick (Anthropic Rock substitute)
Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)
metamorphic (man-made / anthropic)
Cullet Glass (Strawberry Glass)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Mineraloid (Synthetic/Man-made)
Asphalt Concrete
Bituminous Concrete / Asphaltic Composite
not a natural rock (man-made composite)
Goldstone
N/A (Synthetic Glass with Copper Inclusions)
Manufactured Glass
Chipped Glass/Plastic Fragment
Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic
Man-made material (simulant/artifact)
Blue Slag Glass
Amorphous Silica (Industrial byproduct)
Antropogenic (Man-made glass byproduct)
Green Glass Cullet / Recycled Glass
Amorphous Silicon Dioxide (SiO2) with various metal oxides
Man-made Glass (Not a natural rock or mineral)
Metallic Ornament / Jewelry
N/A - This is an artificial object, not a geological specimen.
This appears to be a man-made metallic object, likely jewelry, not a natural rock, mineral, or geological specimen.
United States Quarter Dollar
Cupronickel Clad Alloy (75% Copper, 25% Nickel over a 100% Copper core)
Metal / Man-made mineral-like object
Ferrosilicon Slag (Industrial Vitrified Glass)
Vitreous Silicate Residue
Antropogenic (Man-made industrial byproduct)
Green Slag Glass
Cullet (Amorphous Silicon Dioxide with impurities)
Man-made rock-like material
Slag Glass (Cullet)
Amorphous Silica / Glass residue
Man-made byproduct (Non-geological)
Asphalt (Bituminous Concrete)
Bituminous mix / Anthropogenic conglomerate
man-made composite (lithified equivalent of sedimentary)
US Penny
Cuprum (Copper: Cu) and Zincum (Zinc: Zn) Alloy
Man-made object (metal alloy)
Synthetic Blue Aura Quartz
Silicon Dioxide (SiO2) with Metallic Infusion
mineral (synthetic/man-made coating)
Sea Glass (Teal/Turquoise)
Amorphous Silica (SiO2) with trace metal oxides
Anthropogenic (Man-made material processed by nature)
Cullet Glass (Industrial Slag Glass)
Amorphous Silica (SiO2) with metallic oxide impurities
Man-made byproduct (often mistaken for Obsidian or Emerald)
Sodalite
Sodalite (Sodium Aluminum Silicate Chloride), Na8(Al6Si6O24)Cl2
Mineral
Chert (Arrowhead or Projectile Point)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
Mineral
Schist
Schist (Crystalline metamorphic rock)
metamorphic
Limestone with Calcite Veins
Calcium Carbonate (CaCO3)
sedimentary
Malachite-bearing copper ore
Malachite, Cu₂CO₃(OH)₂, likely mixed with chrysocolla, copper minerals, and iron oxides
mineral
Nutting Stone / Cupstone (Sandstone or Quartzite)
Sedimentary rock with anthropogenic modification (cupule)
sedimentary
Granodiorite
Granodiorite
Igneous
Chert (Yellow or Tan Chert)
Silicon Dioxide (SiO2)
sedimentary
Blue-green mineral specimen, likely fluorite
Fluorite (calcium fluoride, CaF₂), tentative identification
mineral
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Goethite
Goethite (α-FeO(OH))
Mineral
Tumbled blue-gray chalcedony (likely blue agate)
Chalcedony, microcrystalline quartz (SiO₂)
mineral
Quartz (White/Milky Pebble)
Silicon Dioxide (SiO2)
mineral
Likely serpentinized ultramafic rock (serpentinite)
Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, possibly with magnetite, chromite, and brucite
metamorphic
Quartz cluster, possibly druzy quartz on matrix
Quartz (SiO₂), likely microcrystalline to coarse crystalline; associated matrix uncertain
mineral
Limonite with Hematite
Limonite (FeO(OH)·nH2O) and Hematite (Fe2O3)
mineral
Likely slate fragment
Slate; fine-grained foliated metamorphic rock, commonly quartz–mica–chlorite rich
metamorphic
Diamond
Carbon (C) - Native Element
mineral
Likely milky quartz fragment
Quartz (silicon dioxide, SiO₂), possibly with iron-oxide or mica inclusions
mineral
Vesicular basalt (likely weathered lava rock)
Vesicular basalt; primarily plagioclase feldspar, pyroxene, and volcanic glass, with possible iron-oxide alteration
igneous
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Rough Apatite in Matrix
Fluorapatite / Chlorapatite / Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))
mineral