Chalk
Micrite (primarily Calcium Carbonate, CaCO3)
sedimentary
Category
Synthetic (Man Made Glass)
Browse synthetic (man made glass) specimens identified by the Rock Identifier community.
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Sandstone
Arenite (primarily SiO2)
sedimentary
Assorted Semi-Precious Gemstone Crosses
Quartz, Silicates, Carbonates (various)
mineral
Quartz (likely Chalcedony or Chert)
Silicon Dioxide (SiO2)
mineral
Chert
Microcrystalline quartz (SiO2)
sedimentary
Sandstone
Arenite (specifically sublithic or quartz arenite)
sedimentary
Chert (with nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline quartz (SiO2)
sedimentary
Jasper Marble
Silicon Dioxide (SiO2) with Impurities
sedimentary
Amethyst
Amethyst (Silicon Dioxide - SiO2 with Iron impurities)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Red Quartzite
Quartzite (Metamorphic quartz sandstone)
metamorphic
Quartzite
Quartzite (Metamorphic Quartz Sandstone)
metamorphic
Diamond
Carbon (C)
mineral
Moissanite
Silicon Carbide (SiC)
mineral
Cubic Zirconia
Zirconium Dioxide (ZrO2)
mineral
Quartzite
Silica (SiO2) quartzite
metamorphic
Diamond
Carbon (C)
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Mahogany Obsidian
Volcanic glass (SiO2 with Hematite/Magnetite inclusions)
igneous
Beach Pebble (Chalcedony / Chert)
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Quartzose)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Chert (Black Chert or Flint)
Silicon Dioxide (SiO2)
sedimentary
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite
sedimentary
Larimar
Pectolite (NaCa2Si3O8(OH))
Mineral variant / Gemstone
Cubic Zirconia (Faceted)
Zirconium Dioxide (ZrO2)
mineral
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Magnetite or Hematite-rich Ore
Magnetite (Fe3O4) or Hematite (Fe2O3)
mineral
Ruby
Corundum (Al2O3 with Chromium trace impurities)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Polished blue chalcedony or glass-like quartz specimen
Chalcedony (microcrystalline SiO₂), possibly treated or synthetic; exact identification requires testing
gemstone
Flint / Chert
Microcrystalline quartz (SiO2)
sedimentary
Orange Sapphire
Corundum (Al2O3)
gemstone
Chert (often called Flint)
Chert (SiO2)
sedimentary
Diamond
Carbon (C)
gemstone
Diamond
Carbon (C)
gemstone
Diamond
Carbon (C)
mineral
Rough Corundum (Sapphire/Ruby mixture)
Corundum (Aluminum Oxide, Al2O3)
mineral
Diamond (Colorless/White)
Carbon (C)
mineral
Rough White Zircon
Zircon (Zirconium Silicate, ZrSiO4)
mineral