Opalite-style glass pendant
Man-made opalescent glass (not natural opal)
mineral
Category
Industrial Byproduct (Anthropogenic Material)
Browse industrial byproduct (anthropogenic material) specimens identified by the Rock Identifier community.
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Queen Conch Shell (Biogenic Calcium Carbonate)
Aliger gigas (synonym Strombus gigas); Composition: Aragonite (CaCO3)
mineral
Raw Diamond
Carbon (C)
gemstone
Likely slag-encrusted ironstone or a small mineralized rock fragment
Unidentifiable from the image; possibly iron-oxide-rich material (hematite/goethite) with adhering dark slag or debris
mineral
Chintz
Microcrystalline Quartz (SiO2)
sedimentary
Spessartine Garnet
Mn3Al2(SiO4)3
mineral
Likely synthetic ruby (corundum)
Corundum (Al₂O₃), probably laboratory-grown
gemstone
Diamond (or Diamond Simulant)
Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia ZrO2)
gemstone
Obsidian Arrowhead
Volcanic Glass (Primary composition: SiO2)
igneous
Brown Tourmaline
Dravite, NaMg3Al6(Si6O18)(BO3)3(OH)4
mineral
Polished brecciated jasper
Microcrystalline quartz (SiO₂), with iron-oxide staining
mineral
Prasiolite (Green Quartz) / Sea Glass Amalgam
SiO2 (Silicon Dioxide)
mineral
Limestone (Weathered)
Sedimentary Carbonate Rock (CaCO3)
sedimentary
Diamond
C (Native Carbon)
mineral
Possible tektite (natural impact glass)
Impact glass; composition and origin cannot be confirmed from the image
meteorite
Epidote-rich rock (likely epidotite or altered basalt)
Epidote, Ca₂(Al,Fe³⁺)₃(SiO₄)₃(OH); possibly epidote-bearing mafic rock
metamorphic
Garnet Schist
Garnetiferous Mica Schist
metamorphic
Jasper / Chert (Red)
Cryptocrystalline quartz (SiO2)
Sedimentary / Mineral
Tiger’s-eye bead bracelet
Chatoyant quartz, principally quartz (SiO₂) with pseudomorphic fibrous crocidolite/goethite inclusions
gemstone
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Goldfish Cracker (Culinary Mimic)
Cibus aurum (Commonly composed of Enriched Wheat Flour and Cheddar Cheese)
Anthropogenic Sedimentary-style Organic Solid
Green Glass Cullet / Recycled Glass
Amorphous Silicon Dioxide (SiO2) with various metal oxides
Man-made Glass (Not a natural rock or mineral)
Polished Bumblebee jasper
Bumblebee jasper (calcite–orpiment/realgar-rich volcanic material; composition varies)
mineral
Ruby (set in a ring; possibly synthetic or imitation)
Corundum, Al₂O₃; red color is typically caused by chromium
gemstone
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Diamond (or Cubic Zirconia)
Carbon (C) or Zirconium Dioxide (ZrO2)
gemstone
Asphalt Concrete (Bituminous Pavement)
Aggregates in Bitumen Matrix
Technogenic / Anthropogenic Pavement Material
Polished banded jasper (likely picture jasper)
Microcrystalline quartz, chiefly SiO₂; jasper with iron-oxide staining
sedimentary
Orange glassy slag (industrial by-product)
Iron-rich silicate glass; composition varies, commonly Fe–Ca–Al silicate
mineral
Serpentine
Hydrous magnesium iron silicate, (Mg,Fe)3Si2O5(OH)4
metamorphic
Carved pyrite frog or toad
Pyrite (iron disulfide, FeS₂), likely a carved massive aggregate
mineral
Small dark metallic-looking rock fragment
Undetermined; possibly iron oxide-rich material or a metallic mineral
mineral
Grooved Maun Ball (Maul/Hammerstone-like Concretion)
Calcareous/Ferruginous Concretion in Sandstone Matrix
sedimentary
Quartz Sand Gravel
Silicon Dioxide (SiO2)
sedimentary
Crushed Stone Ballast
Crushed Limestone or Granite Aggregate
sedimentary
Sandstone
Quartz Arenite / Clastic Sedimentary Rock
sedimentary
Unidentified brown stone
Indeterminate from the image; possibly a common iron-stained mineral or rock fragment
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Silver (Morgan Dollar)
Native Silver (Ag) - 90% Silver, 10% Copper alloy
mineral
Coal
Combustible sedimentary rock
sedimentary