Chert (specifically Flint or Jasper variant)
Microcrystalline silica (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.
Amber
Fossilized Tree Resin (Succinate)
mineral
Chert / Flint
Chert (Silicon Dioxide, SiO2)
sedimentary
Charoite
K(Ca,Na)2Si4O10(OH,F)·H2O
metamorphic
Chert (Basanite / Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
sedimentary
Chert Pebble
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Amber
Succinite (Fossilized Tree Resin)
mineraloid
Chert (Yellow Jasper variant)
Microcrystalline quartz (SiO2)
sedimentary
Red Jasper (with Quartz Veins)
Jasper (var. chert, SiO₂)
Sedimentary Rock (technically chert, a microcrystalline quartz)
Freshwater Pearl
Aragonite / Biogenic Calcium Carbonate (CaCO3)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Mineral (Variety of Quartz)
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide impurities (Hematite)
sedimentary
Pyrite Geode (Sparkling Druzy)
Iron Sulfide (FeS2) in Sedimentary Nodule
mineral
Red Jasper
Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Amazonite
K(AlSi3O8) - Microcline (Lead-bearing variety)
mineral
River Pebble (Siltstone/Mudstone)
Clastic sedimentary rock
sedimentary
Moss Agate
Cryptocrystalline Quartz (SiO2 with Manganese or Iron Oxide inclusions)
mineral
Chert (Gravel pebble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Iolite (Cordierite)
Cordierite (Magnesium Aluminum Silicate), Mg2Al4Si5O18
Mineral
Fluorite (Rainbow Fluorite)
Calcium Fluoride (CaF2)
mineral
Agate (specifically Lace Agate or Banded Agate)
Silicon Dioxide (SiO2)
mineral
Fossil Shell (Bivalve)
Phylum Mollusca, Class Bivalvia (typically composed of Calcium Carbonate / CaCO3)
sedimentary
Gold
Native Gold (Au)
mineral
Galena
Lead(II) sulfide (PbS)
mineral
Red Jasper (Opaque Chalcedony)
Silicon Dioxide (SiO2) with Hematite impurities
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Chert (specifically Flint or Chalcedony nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (variously Flint)
Chert (Microcrystalline or cryptocrystalline Quartz, SiO₂)
sedimentary
Chert (containing Flint and Calcareous inclusions)
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) impurities
sedimentary
Pyrite in Shale
Iron Sulfide (FeS2) in Sedimentary Matrix
mineral
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Goldstone (Synthetic Aventurescence Glass)
Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)
mineraloid / man-made material
Chert (Beach Pebble)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Red Flagstone)
Clastic sedimentary rock (primarily Quartz - SiO2)
sedimentary
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Geode (unopened)
Chert / Chalcedony Geode (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron impurities
sedimentary