Chert (Mudstone)
Microcrystalline Quartz (SiO2)
sedimentary
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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Black Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Amazonite
Microcline feldspar (KAlSi3O8)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Black Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Travertine (Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Stromatolite
Biogenic sedimentary rock / microbialite
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Serpentinite
Serpentinite (Hydrated magnesium iron silicate)
metamorphic
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron Oxide inclusions
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Rhodochrosite
Rhodochrosite (MnCO3)
mineral
Green Fluorite
Calcium fluoride (CaF2)
mineral
Petrified Wood
Silicified Wood (Quartzo-feldspathic fossil wood)
fossil
Dragon Blood Jasper
Epidote with Red Piedmontite (Chalcedony/Quartz variant)
sedimentary
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Imperial Topaz
Al2SiO4(F,OH)2
gemstone
Chrysocolla on Matrix
Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)
mineral
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Red Sandstone
Arenite (composed primarily of Quartz and Iron Oxide)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Weathered iron-rich chert or siliceous breccia
Microcrystalline quartz (SiO₂), likely with iron oxides and minor clay minerals
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron inclusions
sedimentary
Chert (specifically Brown Chert or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Jasper (variety of Chert) - SiO2
sedimentary
Opal gemstone pendant
Opal (hydrated amorphous silica, SiO₂·nH₂O)
gemstone
Topaz
Al2SiO4(F,OH)2
mineral
Petrified Wood
Silicified Wood
fossil
Petrified Wood
Silicified wood (primarily SiO2 - Silicon Dioxide/Quartz)
metamorphic
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Topaz
Al2SiO4(F,OH)2
gemstone
Yellow Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Red Jasper (Silicate Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary