Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Category
Industrial Byproduct
Browse industrial byproduct specimens identified by the Rock Identifier community.
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Coal (Bituminous Coal)
Caustobiolith / Sedimentary Rock
sedimentary
Quartz Matrix with Iron Staining / Mica Schist
Silicon Dioxide (SiO2) with Iron Oxide staining
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Corundum (Sapphire in Matrix)
Aluminum Oxide (Al2O3)
mineral
Quartz (Agate/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Ruby (Raw Corundum)
Al2O3 (Aluminum Oxide)
mineral
Quartz (Milky or Iron-stained)
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Native Copper with Malachite/Oxide Coating
Native Copper (Cu)
mineral
Diamond (or Diamond Simulant)
Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia ZrO2)
gemstone
Quartz Vein Rock
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Limestone Cobble
Carbonate Rock (CaCO3)
sedimentary
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Sandstone with Iron Staining
Arenite (SiO2 with Fe-oxide impurities)
sedimentary
Mixed Mineral Collection (Quartz, Amethyst, Rose Quartz, Pyrite, etc.)
Mixed Silicates and Sulfides (SiO2, FeS2)
mineral
Vuggy Quartz / Chert
Silicon Dioxide (SiO2)
sedimentary
Garnet
Garnet Group (e.g., Almandine Fe3Al2(SiO4)3 or Pyrope Mg3Al2(SiO4)3)
mineral
Garnet
Garnet Group (Silicate Minerals)
mineral
Garnetiferous Quartzite (Garnet Gneiss Pebble)
Garnet-bearing Quartzite or Quartz-Feldspar Gneiss
metamorphic
Quartzite Pebble
Quartzite (Silicon Dioxide: SiO2)
metamorphic
Quartzite Cobble
Quartzite (mostly SiO2)
metamorphic
Rough Quartz (var. Citrine or Yellow Quartz)
Silicon Dioxide (SiO2)
mineral
Silver (Morgan Dollar)
Native Silver (Ag) - 90% Silver, 10% Copper alloy
mineral
Fossilized Shark Tooth
Carcharodon (Galeocerdo sp. or Lamniform)
mineral
Quartz-encrusted Matrix
Silicon Dioxide (SiO2) with Ferruginous Sandstone
sedimentary
Blue Sapphire
Corundum (Al2O3)
gemstone
Diamond
Diamond (pure Carbon, C)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Limonite (Iron Ore)
Goethite and related iron hydroxides (FeO(OH)·nH2O)
mineral
White Quartz Sphere
Silicon Dioxide (SiO2)
mineral
Man-made Jewelry Charm (Enameled Metal)
Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.
Synthetic / Manufactured Artifact
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Synthetic Resin / Plastic Figurine
Synthetic Polymer (Copolymer of Polyethylene or Resin)
Mineraloid-like Synthetic Material
Concrete rubble
Anthropogenic conglomerate
sedimentary
Possible iron-rich chert or slag-like rock
Microcrystalline quartz (SiO₂), possibly iron-stained chert; exact identification is uncertain from the image
sedimentary
Granite Gravel (Pebble)
Intrusive Felsic Igneous Rock
igneous
Muscovite Mica (in Quartz matrix)
Potassium aluminum silicate hydroxide fluoride (KAl2(AlSi3O10)(F,OH)2)
mineral
Diamond (Faceted Gemstone)
Native Carbon (C)
mineral