Chert (Flint variety)
Chert (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Category
Organic Gemstone (Sedimentary Classification)
Browse organic gemstone (sedimentary classification) specimens identified by the Rock Identifier community.
Learn about Organic Gemstone (Sedimentary Classification) in the encyclopedia
View all →
Yellow Jasper
Cryptocrystalline Quartz (SiO2 with Iron inclusion)
sedimentary
Jasper
Silicon Dioxide (SiO2) - Jasper (Microcrystalline Quartz)
sedimentary
Chert (Jasper variety) with Iron Oxide staining
Cryptocrystalline Quartz (SiO2) with Goethite/Limonite impurities
sedimentary
Jasper (specifically Fancy or Polychrome Jasper)
Silicon Dioxide (SiO2) - Chalcedony
Sedimentary
Agate (specifically Chalcedony/Banded Agate)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Angelite
Anhydrous Calcium Sulfate (CaSO4)
mineral
Amber
Succinite (Fossilized Tree Resin)
fossil
Amber
Succinates (C10H16O)
mineraloid
Amber
Succinite (Resinite), C10-H16-O
mineral
Chert / Chalcedony
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2)
mineral
Fossil Coral
Scleractinia (Anthos), primarily Calcium Carbonate (CaCO3)
sedimentary
Jasper
Silicon Dioxide (SiO2) with iron and magnesium inclusions
sedimentary
Yellow Jasper
Jasper, a microcrystalline variety of Quartz (SiO2) with iron inclusions
sedimentary
White Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite (on host rock)
Iron Sulfide (FeS2)
mineral
Agate
Silicon Dioxide (SiO2) - variety: Chalcedony
mineral
Kyanite
Kyanite (Al2SiO5)
mineral
Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Botryoidal Hematite
Hematite (Iron(III) oxide, Fe2O3)
mineral
Wood Jasper
Siliceous sedimentary rock (variety of Chert/Chalcedony)
Sedimentary
Hematite Nodular Iron Ore
Hematite (Fe2O3)
mineral
Opalite (a synthetic glass, often confused with Opal)
Silicon dioxide glass (SiO2nH2O, for natural opal)
Synthetic (glass)
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Kyanite (Blue Kyanite)
Kyanite (Al2SiO5)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Epidote with Magnetite/Hematite inclusions
Epidote (Ca2(Al2,Fe3+)(SiO4)3(OH)) with Iron Oxides
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Garnet (specifically Almandine)
Almandine - Fe3Al2(SiO4)3
metamorphic
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
White Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineraloid
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Red Garnet (likely Almandine or Pyrope)
Garnet group: X3Y2(SiO4)3 (e.g., Almandine: Fe3Al2Si3O12)
mineral
Red Jasper
Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)
Mineral (variety of Chalcedony/Quartz)