Organic Gemstone (Often Associated With Sedimentary Sequences)

Browse organic gemstone (often associated with sedimentary sequences) specimens identified by the Rock Identifier community.

Chert (specifically Flint)

Chert (SiO2)

sedimentary

Dalmatian Jasper (Dalmatian Stone)

Dalmatian Stone (primarily Feldspar, Quartz, and Arfvedsonite/Tourmaline)

igneous

Chert (Grey Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

sedimentary

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

mineral

Amber

Succinite (specifically for Baltic amber; general formula C10H16O)

Mineraloid (Organic)

Chert (Jasper/Flint variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

mineral

Red Jasper

Jasper (Silicon Dioxide: SiO2 with Iron oxide inclusions)

sedimentary

Jasper

Silicon Dioxide (SiO2) - Jasper (Microcrystalline Quartz)

sedimentary

Chert (specifically Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary

Amber

Succinite (specifically for Baltic amber); Chemical formula approximately C10H16O

mineral

Amber

Succinite (fossilized resin); C10H16O

mineraloid

Lapis Lazuli

A metamorphic rock primarily composed of lazurite (Na,Ca)8[(S,SO4,Cl)2|(Al6Si6O24)], calcite (CaCO3), and pyrite (FeS2).

Mineral

Larvikite

Monzonite (intermediate intrusive igneous rock containing plagioclase, alkali feldspar, augite, and biotite)

igneous

Jasper pebble

Silicon dioxide (SiO2) with iron oxide inclusions

sedimentary (secondary classification: cryptocrystalline quartz)

Malachite

Copper Carbonate Hydroxide [Cu2CO3(OH)2]

mineral

Sandstone

Quartz Arenite (a common type of sandstone, given the appearance), Arkose, Greywacke (depending on mineralogy)

Sedimentary Rock

Stichtite in Serpentine (Atlantisite)

Mg6Cr2CO3(OH)16·4H2O (Stichtite) within Mg3Si2O5(OH)4 (Serpentine)

Metamorphic

Chert (Honey Chert / Flint)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

sedimentary

Jasper

Jasper (Silicon Dioxide, SiO2)

sedimentary

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

mineral

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2, with varying amounts of Calcite, Pyrite, and Sodalite).

Mineral

Quartz

Silicon Dioxide (SiO2)

mineral

Dalmatian Stone (often called Dalmatian Jasper)

Peralkaline Quartz-Feldspar Rock with Arfvedsonite (formerly believed to be Jasper)

igneous

Yellow Jadeite

NaAlSi2O6 (Sodium Aluminum Silicate)

metamorphic

Azurite

Azurite (Cu3(CO3)2(OH)2)

mineral

Pyrite and Fluorite on Quartz (Matrix Specimen)

Iron Disulfide (FeS2) and Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)

mineral

Jasper

Jasper (Silicon Dioxide, SiO2)

sedimentary

Chert (variations include Flint)

Chert (SiO2)

sedimentary

Pyrite

Iron Sulfide (FeS2)

mineral

Chalcedony (Botryoidal or Tumbled)

Chalcedony (SiO₂)

mineral

Ferruginous Chert

Silicon dioxide with iron oxide impurities (SiO2 + Fe2O3)

sedimentary

Tree Agate

Silicon Dioxide (SiO2) with Chlorite/Manganese inclusions

sedimentary

Banded Agate

Silicon dioxide (SiO2) - variety of Chalcedony

mineral

Chert (Jasper-like Silicate)

Microcrystalline quartz (SiO2)

sedimentary

Chert (White Chert)

Silicon Dioxide (SiO2)

sedimentary

Turquoise

Hydrated phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)

mineral

Chert (Jasper)

Microcrystalline Quartz (SiO2)

sedimentary

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

mineral

Quartzite

Quartzite (SiO2)

metamorphic

Chert (often called Flint or Jasper based on color)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary

Black Veined Jasper (Spiderweb Jasper)

Silicon Dioxide (SiO2)

sedimentary