Aquamarine
Beryl (Be3Al2Si6O18)
gemstone
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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Chert (often called Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Banded chert or siliceous sedimentary rock
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide staining and possible carbonate/clay layers
sedimentary
Rhodonite
(Mn,Fe,Mg,Ca)SiO3
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Epidote
Ca2Al2(Fe3+,Al)(SiO43)(Si2O7)O(OH)
mineral
Jasper with Epidote
Silicon Dioxide (SiO2) with Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Chert (and/or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Agate Peat)
Microcrystalline Quartz (SiO2)
sedimentary
Charoite
Charoite (Hydrated potassium, sodium, calcium, barium, strontium silicate hydroxide fluoride)
metamorphic
Tumbled carnelian or red jasper
Microcrystalline quartz (chalcedony), SiO₂, likely iron-stained
gemstone
Amber
Resinite / Fossilized Tree Resin
mineral
Polished ocean jasper (orbicular jasper)
Microcrystalline quartz (SiO₂) with chalcedony, iron oxides, and assorted silicate inclusions
mineral
Sugilite
KNa2(Fe,Mn,Al)2Li3Si12O30
mineral
Selenite (gypsum)
Gypsum, CaSO₄·2H₂O; selenite is its transparent to translucent crystalline variety
mineral
Petrified Wood
Silicified wood (SiO2)
fossil
Carnelian
Silicon dioxide (Chalcedony variety), SiO2
gemstone
Pyrite-bearing sulfide specimen
Pyrite (FeS₂), possibly with chalcopyrite (CuFeS₂) and/or marcasite
mineral
Amber
Succinite (fossilized tree resin, C10H16O)
fossil
Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate - Mn%,Fe%,Mg,Ca)SiO₃
mineral
Turquoise
Hydrous phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O
mineral
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Weathered chert or siliceous iron-rich rock
Microcrystalline quartz (SiO₂), possibly ferruginous chert/jasper
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Pink Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)
mineral
Carnelian
SiO2 (variety of chalcedony)
gemstone
Chert (Arrowhead/Artifact Fragment)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Red Jasper
Microcrystalline quartz (SiO2)
sedimentary
Agate (Carnelian type)
Silicon Dioxide (SiO2)
mineral
Green Jasper
Quartz (Silicon Dioxide, SiO2) with iron silicate inclusions
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Pyrite in Quartz
Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)
mineral
Chert (Jasper/Flint variant)
Microcrystalline quartz (SiO2)
sedimentary
Amber
Succinite (Fossilized Tree Resin)
gemstone
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary