Chert (Jasper variety)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Category
Organic Gemstone (Often Associated With Sedimentary Sequences)
Browse organic gemstone (often associated with sedimentary sequences) specimens identified by the Rock Identifier community.
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Chert (specifically Flint or Gray Chert)
Silicon Dioxide (SiO2)
sedimentary
Amber
Succinite (Organic Mineraloid)
mineral
Red Jasper (possibly Petrified Wood)
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary (secondary formation)
Chert Nodule in Limestone (Flint in Chalk)
SiO2 (Microcrystalline Quartz) in CaCO3 (Calcite)
sedimentary
Amber
Succinite
Organic Gemstone (sedimentary associations)
Chert (often called Flint or Jasper)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Unakite
Epidotized Granite
metamorphic
Chert (Quartz Variety)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (Nodular or Fossiliferous)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Travertine (Tufa)
Travertine (Aragonite/Calcite form of Calcium Carbonate, CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Travertine
Calcareous Tufa (CaCO3)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO₂)
sedimentary
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (Jasper nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert with Crinoid Fossil Impression
Microcrystalline Quartz (SiO2) with Crinoidea fossil impression
sedimentary
Limestone (specifically fossiliferous/skeletal limestone)
Calcium Carbonate (CaCO3)
sedimentary
Chert (Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Red Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (often called Flint or Jasper when pigmented)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Red Sandstone
Arenite (primarily Quartz and Feldspar with Iron Oxide cement)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Black Onyx
Chalcedony (SiO2)
gemstone
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite or Limonite inclusions
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (or Fossiliferous Limestone)
Microcrystalline Quartz (SiO2) / Calcium Carbonate (CaCO3)
sedimentary
Gneiss
Gneiss
metamorphic
Fluorite
Calcium Fluoride (CaF2)
mineral
Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Biotite/Amphiboles)
metamorphic
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Tan/Yellow variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Carnelian
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Chert (often called Jasper or Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Agatized Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Agatized Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Flint)
Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)
sedimentary