Chert (often called Flint or Jasper)
Microcrystalline or Cryptocrystalline 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
View all →
Pyrite-bearing sulfide specimen
Pyrite (FeS₂), possibly with chalcopyrite (CuFeS₂) and/or marcasite
mineral
Tumbled carnelian or red jasper
Microcrystalline quartz (chalcedony), SiO₂, likely iron-stained
gemstone
Chert (Nodule)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Chert (Black Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Turquoise
Hydrous phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Charoite
Charoite (Hydrated potassium, sodium, calcium, barium, strontium silicate hydroxide fluoride)
metamorphic
Amber
Succinite (fossilized tree resin, C10H16O)
fossil
Pyrite
Pyrite (FeS2)
Mineral
Sugilite
KNa2(Fe,Mn,Al)2Li3Si12O30
mineral
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Chert (and/or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Tumbled yellow chalcedony (likely citrine or yellow jasper)
Cryptocrystalline quartz, SiO₂; exact identification requires testing
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate - Mn%,Fe%,Mg,Ca)SiO₃
mineral
Chert (Jasper/Flint variant)
Microcrystalline quartz (SiO2)
sedimentary
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Chert (Arrowhead/Artifact Fragment)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Native copper
Copper (Cu), often with malachite, cuprite, or matrix minerals
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Pink Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)
mineral
Sandstone (Cross-bedded Drill Core)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Weathered gray sandstone or siltstone cobble
Clastic sedimentary rock, likely quartz-rich sandstone/siltstone (diagnosis uncertain from image)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Amber
Resinite / Fossilized Tree Resin
mineral
Shale
Shale
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Chert (Jasper/Agate Peat)
Microcrystalline Quartz (SiO2)
sedimentary
Amber (Rough Baltics/Beach Specimen)
Succinicum (Organic Gemstone - Fossilized Resin)
mineral
Sunstone
Plagioclase Feldspar (Na,Ca)(Si,Al)4O8
mineral
Red Coral (Precious Coral)
Corallium rubrum (Calcium Carbonate, CaCO3)
sedimentary
Amber
Fossilized tree resin (Amorphous organic polymer)
gemstone
Agate (Carnelian type)
Silicon Dioxide (SiO2)
mineral
Green Jasper
Quartz (Silicon Dioxide, SiO2) with iron silicate inclusions
sedimentary