Agate (Moss or Green Agate)
Silicon Dioxide (SiO2)
mineral
Category
Organic Gemstone (Often Associated With Sedimentary Sequences)
Browse organic gemstone (often associated with sedimentary sequences) specimens identified by the Rock Identifier community.
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Chert (Black Chert or Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert with Iron Staining
Microcrystalline quartz (SiO2) with iron oxide inclusions
sedimentary
Jasper
Silicon Dioxide (SiO2)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Fluorite
Calcium fluoride (CaF2)
mineral
Red Jasper
Silicon dioxide with hematite impurities (SiO2 + Fe2O3)
mineral
Kyanite (Purple variety)
Kyanite (Al₂SiO₅)
metamorphic
Carnelian
Silicon dioxide (chalcedony variety), SiO2
gemstone
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Fancy Jasper
Jasper (Cryptocrystalline Quartz, SiO2)
sedimentary
Chert (Smoky variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Siliceous Mudstone variant)
Microcrystalline quartz (SiO2)
sedimentary
Yellow Chalcedony
Silicon Dioxide (SiO2)
mineral
Green Chert (Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
sedimentary
Green Moss Agate
Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite
sedimentary
Chert / Flint
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Jasper (Red Jasper)
Silicon Dioxide (SiO₂)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chalcedony (Agatized Coral / Rough Chalcedony Node)
Silicon Dioxide (SiO2)
mineral
Quartz (Peach/Orange variety)
Silicon Dioxide (SiO2)
mineral
Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3 with Carotenoid pigments)
Mineraloid (Organic Gemstone)
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Black Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Prehnite
Ca2Al(AlSi3O10)(OH)2
mineral
Fuchsite
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Chert (Jasper/Mudstone variety with Oxidation)
Silicon dioxide (SiO2)
sedimentary
Petrified Wood
Silicified wood / Xylopal
fossil
Mica Schist
Mica Schist (Composition: Muscovite, Biotite, Quartz, Feldspar)
metamorphic
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Dragon Stone (Dragon Blood Jasper)
Epidote with Pietersite or Red Jasper inclusions (varied SiO2 and Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Amber (possibly a small polished amber cabochon)
Fossilized tree resin; amber is an organic gemstone, not a mineral
gemstone
Chert (and Jasper/Flint variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Red Jasper (Tumbled)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary