Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
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Industrial Diamond (Bort or Boart)
Diamond (pure Carbon, C)
mineral
Anthracite Coal
Anthracite (Metamorphic/High-grade Sedimentary Coal)
sedimentary
Quartz Druse (on Chalcedony/Agate base)
Silicon Dioxide (SiO2)
mineral
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Green Slag Glass (Cullet)
Amorphous Silica (Industrial Glass Byproduct)
Synthetic/Byproduct (Non-igneous, non-sedimentary, non-metamorphic)
Tumbled Agate (Carnelian/Sard)
Silicon Dioxide (SiO2)
mineral
Anthracite Coal
Anthracite (Highly Metamorphosed Coal)
sedimentary
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Anthracite
Anthracite Coal (C)
sedimentary
Yellow Ochre / Limonite
Limonite (FeO(OH)·nH2O)
Mineral
Synthetic Sapphire and Ion-X Glass
Single-crystal Alumina (Al2O3) and Ion-strengthened Aluminosilicate Glass
mineral
Chert (specifically Flint or Jasper variant)
Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Howlite
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Opalite
Synthetic Opalized Glass / Man-made Glass
gemstone
Orange Sapphire
Corundum (Al2O3 with trace elements)
gemstone
Metal Chain (Likely Steel or a Steel Alloy)
Steel (primarily iron and carbon); specific alloy unknown
Man-made Object (Metal/Alloy)
Garnet-bearing Schist
Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist
metamorphic
White Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Magnetite
Magnetite (Iron(II,III) oxide, Fe3O4)
mineral
Chert / Flint
Cryptocrystalline Quartz (SiO2)
sedimentary
Tumbled White Quartz
Silicon Dioxide (SiO2)
mineral
Coal (Bituminous Coal)
Caustobiolith / Sedimentary Rock
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Rough Diamond
Diamond (pure Carbon, C)
mineral
River Pebble (likely Quartzite or Chert)
Silicon Dioxide (SiO2) crystal conglomerate
sedimentary or metamorphic
Chert (Chert Nodule with Cortex)
Microcrystalline Quartz (SiO2)
sedimentary
Pumice
Pumice (Amorphous volcanic glass)
igneous
Black Garnet (Melanite)
Andradite, Ca3Fe2(SiO4)3
mineral
Garnet Schist
Almandine Garnet-Mica Schist (X₃Y₂(SiO₄)₃)
metamorphic
Jasper (specifically Bloodstone or Heliotrope variety)
Silicon Dioxide (SiO2) with iron oxide inclusions
Sedimentary / Mineral
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Anthracite Coal
Anthracite (Hard Coal)
metamorphic
Coal
Carbonaceous sedimentary rock / Lignite to Bituminous coal
sedimentary
Quartz with Mica Schist Matrix
Quartz (SiO2) in Mica Schist Matrix
metamorphic
Green Banded Chert (Agate/Jasper)
Silicon Dioxide (SiO2) with trace impurities of Chlorite or Glauconite
sedimentary
Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, FeO(OH)·nH2O)
mineral
Magnetite or Magnetic Iron Ore
Magnetite (Fe3O4)
mineral
Chert (specifically Flint)
Silicon dioxide (SiO2)
sedimentary
Granitic Pegmatite
Granite Pegmatite (coarse-grained intrusive igneous rock)
igneous
Native Copper in Matrix
Native Copper (Cu)
mineral