Chert (specifically Flint or Jasper variant)
Chert (Siliceous rock composed of microcrystalline Quartz, SiO2)
sedimentary
Category
Gemstone
Browse gemstone specimens identified by the Rock Identifier community.
Quartz Geode (Cracked)
Silicon Dioxide (SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides (Goethite/Limonite)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
sedimentary
Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (Industrial Byproduct)
mineraloid
Blue Goldstone
Aventurine Glass
Man-made glass (often grouped with minerals in lapidary)
Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)
mineral
Jasper
Silicon Dioxide (SiO2)
sedimentary
Sunstone
Oligoclase (Plagioclase Feldspar) - (Na,Ca)(Si,Al)4O8 with Hematite or Copper inclusions
mineral
Green Jasper (Chert)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Red Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Blue Topaz (facetted in jewelry)
Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)
mineral
Sunstone
Plagioclase Feldspar (specifically Oligoclase variety with hematite or goethite inclusions) Chemical Formula: (Ca,Na)(Al,Si)2Si2O8
Mineral
Turquoise
Hydrated phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)
mineral
Pink Tourmaline (Rubellite)
Rb:Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 (Elbaite variety)
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Amber (and Cubic Zirconia)
Fossilized Tree Resin
mineraloid
Pearl
Calcium carbonate (CaCO3) + organic conchiolin (Biogenic Mineral)
mineral
Pearl
Organic Mineraloid (CaCO3 + Conchiolin)
mineral
Diamond (or Lab-Grown Cubic Zirconia)
Carbon (C)
mineral
Precious Coral
Corallium rubrum (Calcium carbonate with trace carotene)
Organic gemstone / Sedimentary mineraloid
Red Jasper
Jasper (SiO2) - Silicon Dioxide with Hematic impurities
sedimentary
Red Jasper (River Polished)
Jasper (Silicon Dioxide, SiO2)
sedimentary/mineral
Diamond (Faceted)
Carbon (C) - Diamond
mineral
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide / Chalcedony)
metamorphic
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Howlite
Howlite (Calcium borosilicate hydroxide: Ca2B5SiO9(OH)5)
mineral
Yellow Jasper (Chert variant)
Silicon Dioxide (SiO2)
sedimentary
Red Jasper (Tumbled)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Jasper
Jasper (Silicate - SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Banded Agate (specifically Lake Superior Agate style)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Fancy Jasper (Bloodstone variety)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Blue Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Nephrite Jade
Ca2(Mg, Fe)5Si8O22(OH)2 (Magnesium-rich Tremolite-Actinolite)
metamorphic
Red Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
mineral
Jasper pebble
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary (secondary classification: cryptocrystalline quartz)
Garnet
Almandine formula: Fe3Al2(SiO4)3
mineral