Limestone
Calcium Carbonate (CaCO3)
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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Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Prehnite
Prehnite, Ca2Al2Si3O10(OH)2
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Elephant Skin Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron Oxide inclusions
sedimentary
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Chert (Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Rhodochrosite
Rhodochrosite (MnCO3)
mineral
Red Sandstone
Arenite (composed primarily of Quartz and Iron Oxide)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Chert (Mudstone)
Microcrystalline Quartz (SiO2)
sedimentary
Green Fluorite
Calcium fluoride (CaF2)
mineral
Weathered iron-rich chert or siliceous breccia
Microcrystalline quartz (SiO₂), likely with iron oxides and minor clay minerals
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Black Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Chrysocolla on Matrix
Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)
mineral
Travertine (Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O
mineral
Petrified Wood
Silicified Wood (Quartzo-feldspathic fossil wood)
fossil
Yellow Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Red Jasper
Jasper (variety of Chert) - SiO2
sedimentary
Opal gemstone pendant
Opal (hydrated amorphous silica, SiO₂·nH₂O)
gemstone
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Dragon Blood Jasper
Epidote with Red Piedmontite (Chalcedony/Quartz variant)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron inclusions
sedimentary
Red Jasper (Silicate Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Carnelian Agate
Carnelian (SiO2 with iron oxide impurities)
mineral
Petrified Wood
Silicified wood (primarily SiO2 - Silicon Dioxide/Quartz)
metamorphic
Blue Apatite
Calcium Phosphate (Ca5(PO4)3(F,Cl,OH))
mineral
Chert (specifically Brown Chert or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary