Banded Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Category
Organic Gemstone (Sedimentary Associations)
Browse organic gemstone (sedimentary associations) specimens identified by the Rock Identifier community.
Learn about Organic Gemstone (Sedimentary Associations) in the encyclopedia
View all →
Amber jewelry (possibly amber-colored glass or resin)
Amber — fossilized plant resin, chiefly composed of polymerized terpenoids; the pictured material cannot be confirmed from the image
gemstone
Amber
Fossilized Tree Resin
gemstone
Amber
Succinicum (Organic polymer, largely C10H16O)
Organic Mineral
Weathered chert or silicified limestone
Microcrystalline quartz (SiO₂), likely chert formed by silicification of carbonate rock
sedimentary
Chert (Black Flint)
Silicon Dioxide (SiO2)
sedimentary
Fossiliferous Shale
Carbonaceous Shale (with potential plant/aquatic fossils)
sedimentary
Amber (Cherry or Red variety)
Succinite (with various trace amounts of organic compounds)
Organic Gemstone (not a rock)
Garden Quartz (Lodolite / Inclusion Quartz)
Quartz with inclusions (SiO2 with various mineral inclusions)
gemstone
Amber
Resinite (Succinite if from the Baltic); Chemical Formula: C10H16O (approximate)
Organic Diamond/Gemstone (often associated with Sedimentary sequences)
Jasper
Silicon dioxide (SiO2)
Mineral
Tumbled green serpentine
Serpentine-group minerals, chiefly antigorite and lizardite; commonly Mg₃Si₂O₅(OH)₄
metamorphic
Amber
Succinite (approximate formula C10H16O)
mineral
Ironstone (Limonitic Shale)
Ferruginous Siltstone / Goethite-rich Sedimentary Rock
sedimentary
Pyrite
Pyrite (Iron Disulfide), FeS2
Mineral
Coal (most likely Bituminous or Anthracite)
Coal (organic sedimentary rock)
Sedimentary
Chert Pebble
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Pearl
Organic gemstone (Calcium carbonate / CaCO3 + Conchiolin)
mineral
Chert (Jasper/Chalcedony mix)
Microcrystalline Quartz (SiO2)
sedimentary
Polished brecciated quartz specimen
Quartz (SiO₂), likely with iron-oxide staining and minor associated minerals
mineral
Fossilized Bone
Vertebrate fossil (mineralized bone)
fossil
Fluorite
Calcium Fluoride (CaF2)
mineral
Chert (Chalky/Gray Variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Fossilized Bone
Petrified Bone / Biogenic Sedimentary
fossil
Black Limestone
Bituminous Limestone (Calcium Carbonate - CaCO3)
sedimentary
Natural White Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin - CaCO3
mineraloid
Pearl
Calcium carbonate (CaCO3) in the form of Aragonite or Calcite
mineral
Pearl
Calcium Carbonate (primarily Aragonite and Calcite), CaCO3
mineral
Chert (Flint nodule)
Chert (SiO2)
sedimentary
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sedimentary Rock (Limestone or Siltstone pebble)
Sedimentary rock fragment
sedimentary
Mixed Gemstone and Mineral Collection
Silicon Dioxide (SiO2) based minerals and others
mineral
Pyritic Shale
Carbonaceous Shale with Iron Pyrite (FeS2)
sedimentary
Weathered, quartz-rich metamorphic rock (likely schist or gneiss)
Quartz–feldspar–mica schist/gneiss, with surface lichens and iron-oxide staining
metamorphic
Chert (Flint variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Likely bituminous coal
Coal, predominantly carbon-rich organic matter with variable maceral and mineral content
sedimentary
Bloodstone (Heliotrope)
SiO2 (Silicon Dioxide with inclusions of Chlorite, Amphibole, or Hematite)
mineral
Pearl (incorporated into jewelry)
Aragonite and Calcite (CaCO3)
mineral
Pyrite (Iron Pyrite) with Goethite Oxidation
Iron Sulfide (FeS2)
mineral
Red Jasper
Jasper (Silicon Dioxide, SiO2 with iron oxide impurities)
sedimentary
Serpentine
(Mg,Fe)3Si2O5(OH)4
metamorphic
Limonite-goethite ironstone specimen
Goethite (α-FeO(OH)) with limonite, quartz, and iron oxides
mineral