Dyed Blue Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Category
Man Made (Synthetic Rock)
Browse man made (synthetic rock) specimens identified by the Rock Identifier community.
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Diamond (Cut jewelry specimen)
Diamond (pure Carbon, C)
mineral
Ruby in Matrix
Corundum (Al2O3)
mineral
Granite, possibly granodiorite
Coarse-grained felsic plutonic rock; chiefly quartz (SiO₂), potassium feldspar and plagioclase feldspar, with biotite and/or hornblende
igneous
Peridot gemstone pendant
Olivine, gem-quality forsteritic olivine (approximately (Mg,Fe)₂SiO₄)
gemstone
Coquina
Bioclastic Limestone
sedimentary
Coquina
Bioclastic Limestone
sedimentary
Blue Opal Inlay (Simulated/Lab-created)
Hydrated Amorphous Silica (SiO2·nH2O) with polymer resin
mineraloid
Ruby
Corundum (Aluminium Oxide with Chromium impurities, Al2O3:Cr)
mineral
Ruby (Corundum)
Corundum (Aluminum Oxide) with chromium trace elements, Al2O3
mineral
Petoskey Stone
Hexagonaria percarinata
fossil
Diamond (Cut and Polished)
Diamond (pure Carbon, C)
gemstone
Diamond
Carbon (C)
mineral
Chert (specifically Flint Arrowhead)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Fossil Sea Urchin (Echinoid)
Echinoidea fossil (often replaced by silica or calcite)
fossil
Composite Turquoise or Reconstituted Turquoise with Copper inclusions
CuAl6(PO4)4(OH)8·4H2O (Turquoise) mixed with matrix and copper/bronze flakes
mineral
Fossiliferous Limestone
Limestone (composed primarily of calcite with included fossils CaCO3)
Sedimentary
Emerald
Beryl (Be3Al2(SiO3)6)
gemstone
Obsidian
Volcanic Glass (70% or more SiO2)
igneous
Bismuth
Bismuth (Bi)
Mineral
Lapis Lazuli
Lapis Lazuli (Complex rock consisting primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2)
metamorphic
Flint/Chert Nodule in Limestone
Sedimentary rock containing microcrystalline quartz (SiO2) within a calcium carbonate (CaCO3) matrix
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Moonstone (bead form)
Potassium Aluminum Silicate (KAlSi3O8) - a variety of Orthoclase Feldspar
Mineral
Seashell Fragment
Calcium carbonate (CaCO3) - primarily Aragonite or Calcite
fossil
Diamond (Cut Gemstone)
Carbon (C)
gemstone
Coquina
Bioclastic Limestone
sedimentary
Opal (in Jewelry Setting)
Hydrated Silicon Dioxide (SiO2·nH2O)
gemstone
Diamond
Pure Carbon (C)
mineral
Blue Sapphire
Corundum (Al2O3) with traces of Iron and Titanium
mineral
Chert (specifically Yellow/Brown Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Banded agate pendant (likely carnelian or brown-and-white chalcedony agate)
Agate, a banded variety of chalcedony; microcrystalline quartz, SiO₂, with iron-oxide coloration
gemstone
Cubic Zirconia
Zirconium Dioxide (ZrO2)
mineral
Chalcanthite
Copper(II) sulfate pentahydrate (CuSO4·5H2O)
mineral
Staurolite (Cross Stone)
Staurolite (Fe2+2Al9Si4O23(OH))
metamorphic
Smoky Quartz
SiO2 (Silicon Dioxide)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide)
igneous
Cubic Zirconia (Simulated Diamond)
Zirconium Dioxide (ZrO2)
mineral (synthetic)
Diamond
Diamond (pure Carbon, C)
mineral
Diamond Plate (Steel)
Alloyed Carbon Steel or Aluminum with 'Durbar' pattern
not a rock (Man-made industrial metal)