Iron Slag
Anthropogenic Ferro-silicate
mineral
Category
Mineral (Man Made Glass, Not Natural)
Browse mineral (man made glass, not natural) specimens identified by the Rock Identifier community.
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Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz (Clear / Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate nodule fragment)
Silicon Dioxide (SiO2)
mineral
Sunstone
Aventurine Feldspar (Plagioclase Feldspar with inclusions)
mineral
Citrine
Silicon Dioxide (SiO2) with iron impurities
gemstone
Agate (Beads)
Silicon Dioxide (SiO2)
mineral
Chert (Yellow Jasper)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Bauxite
Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))
sedimentary
Limonite (Iron Ore)
Hydrated ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Sandstone Flagstone
Arenite (SiO2 with various cementing agents)
sedimentary
Dyed Fuchsia Agate
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Bivalve Fossil (Shell-bearing Sedimentary Rock)
Class Bivalvia (Phylum Mollusca) within a Calcarenite/Sandstone matrix
fossil
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Amethyst
SiO2 (Silicon Dioxide)
Mineral
Tumbled jasper, likely red jasper
Microcrystalline quartz (SiO₂), chalcedony variety with iron-oxide impurities
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Jasper with Hematite
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)
sedimentary
Polished blue banded agate slice
Chalcedony (microcrystalline quartz), SiO₂, commonly with trace iron and other coloring elements
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Limonite / Ironstone Nodule
Hydrated Iron Oxide (FeO(OH)·nH2O)
sedimentary
Likely citrine pendant
Quartz, silicon dioxide (SiO₂), probably heat-treated amethyst or smoky quartz
gemstone
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Quartz (Citrine/Yellow Jasper Pebble)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Ferruginous)
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Emerald in Quartz Matrix
Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium
gemstone
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with Iron impurities
mineral
Quartz Pebble (Chalcedony / Agate)
Silicon Dioxide (SiO2)
sedimentary
Amethyst-rich vesicular volcanic rock (probable amethyst basalt/scoria)
Quartz (SiO₂) in vesicular basaltic volcanic rock; precise identification requires testing
igneous
Granite
Granite
igneous
Peacock Ore (Bornite or Chalcopyrite)
Bornite (Cu5FeS4) or Acid-Washed Chalcopyrite (CuFeS2)
mineral
Sapphire (likely blue synthetic sapphire or blue glass in a ring)
Corundum (Al₂O₃), specifically the blue variety due to trace amounts of iron and titanium impurities. If synthetic, it would still be Al₂O₃.
Mineral
Banded Basalt / Lave Stone or Gneiss Pebble
Igneous/Metamorphic banded pebble
igneous
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Copper slag or vesicular basalt with copper minerals
Industrial slag / Basaltic matrix with secondary copper minerals
igneous
Dyed pink agate slice
Agate (microcrystalline quartz, SiO₂), commonly chalcedony with artificial dye
mineral
Blue chalcedony cabochon (probable)
Chalcedony, cryptocrystalline quartz; silicon dioxide (SiO₂)
gemstone
Blue calcite sphere
Calcite (CaCO₃), commonly blue-calcite variety
mineral
Limonite / Goethite pseudomorph
Hydrated Iron Oxide (FeO(OH)·nH2O)
mineral
Black Beach Pebble / Basalt Pebble
Basalt / Mafic Volcanic Rock
igneous