Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Category
Organic Gemstone (Often Associated With Sedimentary Sequences)
Browse organic gemstone (often associated with sedimentary sequences) specimens identified by the Rock Identifier community.
Learn about Organic Gemstone (Often Associated With Sedimentary Sequences) in the encyclopedia
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Carnelian
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Black Pearl (Tahitian or Irradiated Type)
Organic gemstone (Calcium Carbonate with Conchiolin Binding)
mineraloid
Rhodochrosite
Rhodochrosite (MnCO3)
mineral
Kyanite (Blue Kyanite)
Kyanite (Al2SiO5)
mineral
Amber
Succinite (Organic Gemstone)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Jasper (Green Jasper / Moss Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Greenstone (Greywacke or Nephrite Jade variant)
Metamorphosed mafic igneous or sedimentary rock (e.g., Actinolite-Chlorite Schist)
metamorphic
Blue Apatite
Apatite group (Ca5(PO4)3(F,Cl,OH))
mineral
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Amber (Copal)
Fossilized Tree Resin (C10H16O)
mineral
Chert / Flint
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Prehnite
Prehnite, Ca2Al2Si3O10(OH)2
mineral
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Amber and Citrine Quartz
Succinite (Amber) and Silicon Dioxide (SiO2 / Citrine)
mineral
Chert (Jasper variation)
Silicon dioxide (SiO2)
sedimentary
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron Oxide inclusions
sedimentary
Chert
Microcrystalline quartz (SiO2)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Mica Schist
Mica Schist (Composition: Muscovite, Biotite, Quartz, Feldspar)
metamorphic
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Turquoise
Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O
mineral
Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3 with Carotenoid pigments)
Mineraloid (Organic Gemstone)
Red Jasper
Jasper (Silicon Dioxide) - SiO2
sedimentary
Chert (Chert Nodule with Cortex)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Amber (and Cubic Zirconia)
Fossilized Tree Resin
mineraloid
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Yellow Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Quartz (Chert/Quartzite variant)
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Amber
Organic gemstone (Succinite is common if from the Baltic)
mineral
Green Fluorite
Calcium fluoride (CaF2)
mineral
Picture Jasper
SiO2
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary