Chalcedony
Cryptocrystalline Quartz (SiO2)
Category
Browse carved stone specimens identified by the Rock Identifier community.
Chalcedony
Cryptocrystalline Quartz (SiO2)
Obsidian
Volcanic Glass (Silicon Dioxide with impurities)
Nephrite Jade
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)
Carnelian (Red Agate)
Silicon dioxide (SiO2) with iron oxide impurities
Rose Quartz
Rose Quartz (SiO2 with traces of Titanium, Iron, or Manganese)
Anthracite Coal
Anthracite (Carbon Content: 86%–98%)
Aventurine
Quartz containing inclusions of Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Obsidian
Volcanic Glass (SiO2)
Common Opal (Green Opal)
Hydrated Silicon Dioxide (SiO2·nH2O)
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)
Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2
Anthracite Coal
Anthracite (high-rank coal)
Tiger's Eye (Rough)
Pseudomorph of Quartz after Crocidolite (SiO2 with FeOOH inclusions)
Obsidian
Obsidian (principally SiO2 - Silicon Dioxide)
Green Onyx (Banded Calcite)
Calcite (Calcium Carbonate, CaCO3)
Azurite-Malachite (often called Azerite Malachite or Azurmalachite)
Azurite (Cu3(CO3)2(OH)2) and Malachite (Cu2CO3(OH)2)
Fluorite
Calcium Fluoride (CaF2)
African Turquoise (Jasper)
Quartz (SiO2) with impurities (Epidote/Amphibole)
Green Fluorite
Calcium Fluoride (CaF2)
Lepidolite
K(Li,Al)_3(Si,Al)_4O_10(F,OH)_2 (Lithium-bearing Mica)
Tumbled honey calcite
Calcite (calcium carbonate, CaCO₃)
Amber
Succinite (fossilized tree resin, C10H16O)
Anthracite Coal
Anthracite (Highly Metamorphosed Coal)
Common Opal (Potch)
Hydrated Silica (SiO2·nH2O)
Sandstone Concretion
Moqui Marble / Ironstone Concretion (Iron oxide-cemented sandstone)
Anthracite Coal
Anthracite
Fluorite
Calcium Fluoride (CaF2)
Aventurine
Aventurine Quartz (SiO2 with inclusions)
Yellow Jade (Nephrite)
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')
Calcite (CaCO3)
Carnelian
Carnelian (Silicon Dioxide - SiO2)
Carnelian
Silicon Dioxide (Chalcedony variety), SiO2
Nephrite Jade
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)
Lepidolite
Lepidolite (K(Li,Al)3(Si,Al)4O10(F,OH)2)
Red Jasper
Silicon Dioxide with iron impurities (Quartz variety, SiO2)
Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2
Unakite
Epidotized Granite
Carnelian (Tumbled)
Carnelian (Chalcedony / Silicon Dioxide, SiO2)
Rose Quartz
Silicon dioxide (SiO2)
Carnelian
Carnelian (Silicon Dioxide, SiO2)
Obsidian
Obsidian (Volcanic Glass, primarily SiO2)