Aquamarine
Beryl (Be3Al2Si6O18 with Fe impurities)
mineral
Category
Industrial Byproduct
Browse industrial byproduct specimens identified by the Rock Identifier community.
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Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Blue Calcite Sphere
Calcium Carbonate (CaCO3)
mineral
Basalt (Road Aggregate Specimen)
Aphanitic mafic volcanic rock
igneous
Quartzite Cobble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Cubic Zirconia
Zirconium dioxide (ZrO2)
mineralogical simulant / gemstone
Diamond
Carbon (C)
gemstone
Garnet (Polished)
Nesosilicate (Group formula: X3Y2(SiO4)3)
gemstone
Weathered quartz-rich rock fragment
Indeterminate; likely quartz-bearing granitoid or quartzite
mineral
Unidentified weathered mineral/rock fragment
Indeterminate; likely a weathered iron-rich silicate or sulfide-bearing specimen
mineral
Polished orbicular jasper (likely ocean jasper)
Microcrystalline quartz/chalcedony with iron-oxide and other mineral inclusions; SiO₂
mineral
Tiger’s-eye bead bracelet
Chatoyant quartz, principally quartz (SiO₂) with pseudomorphic fibrous crocidolite/goethite inclusions
gemstone
Tumbled jasper, likely picture jasper or brecciated jasper
Microcrystalline quartz (SiO₂), chiefly chalcedony with iron-oxide pigments
mineral
Small rounded pebble
Indeterminate lithic grain; likely weathered sandstone, iron-stained quartz-rich rock, or a concretion
sedimentary
Banded agate tower (likely onyx/chalcedony)
Microcrystalline quartz, SiO₂; commonly called banded agate or black-and-white onyx
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Black Kyanite
Aluminum Silicate (Al2SiO5)
mineral
Schist
Mica Schist
metamorphic
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Blue Sapphire (likely lab-grown or treated)
Corundum (Aluminum Oxide, Al2O3)
gemstone
Sandstone
Arenite (SiO2 primarily)
sedimentary
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)
mineral
Blue Sapphire and Diamond (Set in Metal)
Corundum (Al2O3) and Diamond (C)
mineral
Quartz with Mica inclusions (likely Schist or Gneiss host)
Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)
metamorphic
Mica Schist
Mica Schist (Predominantly Muscovite/Biotite)
metamorphic
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Cubic Zirconia
Cubic Zirconium Dioxide (ZrO2)
mineral
Bull Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Sandstone (Water-worn Cobble)
Arenite (SiO2 based)
sedimentary
Quartz-veined Metamorphic Rock
Quartz Vein in Phyllite or Schist (SiO2 in Silicate Matrix)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz vein in metamorphic rock
Crystalline Silicon Dioxide (SiO2) in Host Rock
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Yellow/Citrine variety or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Epidote-bearing Rock / Epidote Inclusion
Epidote (Ca2(Al, Fe)3(SiO4)3(OH)) in host rock
mineral
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Agate
SiO2 (Silicon Dioxide)
gemstone
Diamond (or Clear Quartz / Cubic Zirconia)
Carbon (C) or Silicon Dioxide (SiO2) / Cubic Zirconia (ZrO2)
gemstone
Milky Quartz Nodule / Geode precursor
Silicon Dioxide (SiO2)
mineral