Rock Identifier

Category

Organic Gemstone (Not A Rock Or Mineral)

Browse organic gemstone (not a rock or mineral) specimens identified by the Rock Identifier community.

Chert (White/Light Tan) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (White/Light Tan)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Limonite (Iron Ore) (Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)) — mineral

Limonite (Iron Ore)

Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)

Amethyst Quartz (Amethyst (SiO2 with Iron impurities)) — mineral

Amethyst Quartz

Amethyst (SiO2 with Iron impurities)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Chert (Flint nodule) (Chert (SiO2)) — sedimentary

Chert (Flint nodule)

Chert (SiO2)

Banded Chert (Jasper) (Silicon Dioxide (SiO2)) — sedimentary

Banded Chert (Jasper)

Silicon Dioxide (SiO2)

Human Skin (Epidermis/Dermis) (Integumentary tissue (High content of hydroxyapatite in bones, though the surface is biological)) — Mineral-like biological tissue

Human Skin (Epidermis/Dermis)

Integumentary tissue (High content of hydroxyapatite in bones, though the surface is biological)

Mineral-like biological tissue

Wood Jasper (Siliceous sedimentary rock (variety of Chert/Chalcedony)) — Sedimentary

Wood Jasper

Siliceous sedimentary rock (variety of Chert/Chalcedony)

Chert (Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (Jasper/Flint variety) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fluorite (Green Fluorite on Host Rock) (Fluorite (Calcium Fluoride, CaF2)) — mineral

Fluorite (Green Fluorite on Host Rock)

Fluorite (Calcium Fluoride, CaF2)

Unakite (Epidotized Granite) — metamorphic

Unakite

Epidotized Granite

Banded Chert in Matrix (Microcrystalline Quartz (SiO2)) — sedimentary

Banded Chert in Matrix

Microcrystalline Quartz (SiO2)

Nacre (Mother of Pearl) (Nacre (Biogenic Aragonite/Calcite composite, CaCO3)) — mineral

Nacre (Mother of Pearl)

Nacre (Biogenic Aragonite/Calcite composite, CaCO3)

Amber (Butterscotch/Egg Yolk Variety) (Succinite (Approx. C10H16O)) — Organic Gemstone

Amber (Butterscotch/Egg Yolk Variety)

Succinite (Approx. C10H16O)

Organic Gemstone

Olivine in Basalt (Peridot) (Magnesium Iron Silicate (Mg, Fe)2SiO4 in Vesicular Basalt) — igneous

Olivine in Basalt (Peridot)

Magnesium Iron Silicate (Mg, Fe)2SiO4 in Vesicular Basalt

Epidote (or Epidote-rich rock) (Epidote. Mineral formula: Ca2(Al,Fe)3(SiO4)3(OH).) — Mineral, often found in metamorphic rocks but also in sedimentary and igneous rocks

Epidote (or Epidote-rich rock)

Epidote. Mineral formula: Ca2(Al,Fe)3(SiO4)3(OH).

Mineral, often found in metamorphic rocks but also in sedimentary and igneous rocks

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

Turquoise

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

Jasper (Jasper / Silicon Dioxide (SiO₂)) — sedimentary

Jasper

Jasper / Silicon Dioxide (SiO₂)

Unakite (Unakite (Epidotized Granite)) — metamorphic

Unakite

Unakite (Epidotized Granite)

Unakite (Epidotized Granite) — metamorphic

Unakite

Epidotized Granite

Chert (Grey-Green Var.) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Grey-Green Var.)

Silicon Dioxide (SiO2)

Chrysoprase (Chrysoprase (a variety of Chalcedony, SiO₂)) — Mineral

Chrysoprase

Chrysoprase (a variety of Chalcedony, SiO₂)

Amber (Succinite (fossilized resin)) — mineral

Amber

Succinite (fossilized resin)

Chert (Chert Nodule) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Chert Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz (Clear Quartz/Rock Crystal) (Silicon Dioxide (SiO2)) — mineral

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Pyrite Geode (Iron Disulfide (FeS2)) — mineral

Pyrite Geode

Iron Disulfide (FeS2)

Garden Quartz (Included Quartz (SiO2 with accessory minerals such as Chlorite, Hematite, or Feldspar)) — mineral

Garden Quartz

Included Quartz (SiO2 with accessory minerals such as Chlorite, Hematite, or Feldspar)

Moss Agate (Silicon Dioxide (SiO2) with Chlorite/Oxide inclusions) — mineral

Moss Agate

Silicon Dioxide (SiO2) with Chlorite/Oxide inclusions

Slate (Slate (foliated metamorphic rock, primarily composed of quartz, illite, chlorite, and micas)) — metamorphic

Slate

Slate (foliated metamorphic rock, primarily composed of quartz, illite, chlorite, and micas)

Cherry Creek Jasper (also known as Red Creek Jasper or Cherry Creek Agate) (Jasper, microcrystalline quartz (SiO₂)) — Sedimentary Rock

Cherry Creek Jasper (also known as Red Creek Jasper or Cherry Creek Agate)

Jasper, microcrystalline quartz (SiO₂)

Sedimentary Rock

Fossil Shark Tooth (Sand Tiger or Mackerel Shark) (Carcharias sp. or Otodus sp. replaced by Hydroxylapatite/Calcium Carbonate) — sedimentary

Fossil Shark Tooth (Sand Tiger or Mackerel Shark)

Carcharias sp. or Otodus sp. replaced by Hydroxylapatite/Calcium Carbonate

Shungite (Carbonaceous rock (primarily amorphous carbon)) — Mineraloid

Shungite

Carbonaceous rock (primarily amorphous carbon)

Amethyst (Quartz) (SiO2 (Silicon Dioxide)) — mineral

Amethyst (Quartz)

SiO2 (Silicon Dioxide)

Chert (Jasper/Flint variety) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Amber (Succinite (with a generalized formula of C10H16O)) — mineral

Amber

Succinite (with a generalized formula of C10H16O)

Unakite (Epidotized Granite) — metamorphic

Unakite

Epidotized Granite

Lapis Lazuli (Lapis Lazuli (a rock, not a single mineral; primary mineral is Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2) — Metamorphic rock

Lapis Lazuli

Lapis Lazuli (a rock, not a single mineral; primary mineral is Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2

Metamorphic rock

Quartz Crystal (specifically Rock Crystal) (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal (specifically Rock Crystal)

Silicon Dioxide (SiO2)

Sandstone Concretion with Fossil Wood (Ferruginous Sandstone Concretion (SiO2 with Fe2O3 cement)) — sedimentary

Sandstone Concretion with Fossil Wood

Ferruginous Sandstone Concretion (SiO2 with Fe2O3 cement)

Peridot (likely, based on color and appearance) (Olivine group mineral, specifically (Mg,Fe)2SiO4 (Forsterite-Fayalite solid solution series)) — Mineral

Peridot (likely, based on color and appearance)

Olivine group mineral, specifically (Mg,Fe)2SiO4 (Forsterite-Fayalite solid solution series)

Baroque Pearl (Biogenic Calcium Carbonate (Aragonite/Conchiolin)) — mineral

Baroque Pearl

Biogenic Calcium Carbonate (Aragonite/Conchiolin)