Rock Identifier

Category

Organic (Non Geological)

Browse organic (non geological) specimens identified by the Rock Identifier community.

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

River Stone (Chert/Basalt mix) (Microcrystalline Quartz (Chert) / Basalt) — sedimentary

River Stone (Chert/Basalt mix)

Microcrystalline Quartz (Chert) / Basalt

Quartz Geode / Druzy Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz Geode / Druzy Quartz

Silicon Dioxide (SiO2)

Amber (Cherry Amber) (Succinite (C10H16O)) — Organic Gemstone

Amber (Cherry Amber)

Succinite (C10H16O)

Organic Gemstone

Quartzite River Cobble (Quartzite (SiO2)) — metamorphic

Quartzite River Cobble

Quartzite (SiO2)

Amber (Succinite (Approximate formula: C10H16O)) — mineral

Amber

Succinite (Approximate formula: C10H16O)

Polished septarian nodule (Septarian concretion, commonly calcite/aragonite with brown calcite or barite veins in a limestone–clay matrix) — sedimentary

Polished septarian nodule

Septarian concretion, commonly calcite/aragonite with brown calcite or barite veins in a limestone–clay matrix

Pyrite (Fool's Gold) (Iron Sulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Rounded brown river pebble (Indeterminate lithic fragment; possibly weathered sandstone, mudstone, or basalt) — sedimentary

Rounded brown river pebble

Indeterminate lithic fragment; possibly weathered sandstone, mudstone, or basalt

Black Freshwater Pearls (Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3) — mineral

Black Freshwater Pearls

Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3

Greenstone / Glauconitic Siltstone (Metabasalt or Glauconite-rich Sedimentary Rock) — metamorphic or sedimentary

Greenstone / Glauconitic Siltstone

Metabasalt or Glauconite-rich Sedimentary Rock

metamorphic or sedimentary

Anthracite Coal (Anthracite) — sedimentary

Anthracite Coal

Anthracite

River Pebble (likely Quartzite or Diorite) (Metamorphosed Quartz-rich Rock / Intermediate Igneous Rock) — metamorphic

River Pebble (likely Quartzite or Diorite)

Metamorphosed Quartz-rich Rock / Intermediate Igneous Rock

Shale (with Iron Staining) (Argillaceous mudstone / Shale) — sedimentary

Shale (with Iron Staining)

Argillaceous mudstone / Shale

Amber (Succinite (Fossilized Resin C10H16O)) — Organic Mineraloid

Amber

Succinite (Fossilized Resin C10H16O)

Organic Mineraloid

Weathered polymictic gravel/conglomeratic rock (Polymictic conglomerate or poorly lithified alluvial gravel; chiefly quartz, feldspar, mica, and dark lithic fragments) — sedimentary

Weathered polymictic gravel/conglomeratic rock

Polymictic conglomerate or poorly lithified alluvial gravel; chiefly quartz, feldspar, mica, and dark lithic fragments

Small tumbled brown stone, likely iron-stained quartz or jasper (Quartz (SiO₂) or microcrystalline quartz (chalcedony/jasper), identification uncertain from the image) — mineral

Small tumbled brown stone, likely iron-stained quartz or jasper

Quartz (SiO₂) or microcrystalline quartz (chalcedony/jasper), identification uncertain from the image

Jasper (Silicon Dioxide (SiO2) with impurities) — sedimentary

Jasper

Silicon Dioxide (SiO2) with impurities

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

Chert (Jasper variation)

Silicon Dioxide (SiO2)

Desert Rose Fragment (Atypical) / Weathered Chert (Silicon Dioxide (SiO2) or Barium Sulfate (BaSO4) depending on exact mineralogy) — sedimentary

Desert Rose Fragment (Atypical) / Weathered Chert

Silicon Dioxide (SiO2) or Barium Sulfate (BaSO4) depending on exact mineralogy

Faceted gemstone in a jewelry setting (Indeterminate from image; likely quartz, cubic zirconia, or another transparent faceted stone) — gemstone

Faceted gemstone in a jewelry setting

Indeterminate from image; likely quartz, cubic zirconia, or another transparent faceted stone

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

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (Smooth River Pebble) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Smooth River Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chalcopyrite (CuFeS2) — mineral

Chalcopyrite

CuFeS2

Glauconitic Sandstone (Glauconitic Quartz Arenite) — sedimentary

Glauconitic Sandstone

Glauconitic Quartz Arenite

Chert (specifically Flint or Jasper variant) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (specifically Flint or Jasper variant)

Microcrystalline quartz (SiO2)

Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)

Chert (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert

Cryptocrystalline Quartz (SiO2)

Rounded iron-rich stone or concretion (Indeterminate; possibly hematite-/goethite-bearing sandstone or an ironstone concretion) — sedimentary

Rounded iron-rich stone or concretion

Indeterminate; possibly hematite-/goethite-bearing sandstone or an ironstone concretion

Quartzite (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite

Metamorphic Quartzite (SiO2)

Petrified Wood (Silicified Wood (SiO2 permineralization)) — sedimentary

Petrified Wood

Silicified Wood (SiO2 permineralization)

Emerald and diamond ring (Emerald: beryl, Be3Al2Si6O18, colored green by chromium and/or vanadium; surrounding stones appear to be diamonds, crystalline carbon (C)) — gemstone

Emerald and diamond ring

Emerald: beryl, Be3Al2Si6O18, colored green by chromium and/or vanadium; surrounding stones appear to be diamonds, crystalline carbon (C)

Anthracite (Anthracite Coal) — sedimentary

Anthracite

Anthracite Coal

Petrified Wood (Silicified Wood (primarily Quartz/Chalcedony, SiO2)) — fossil

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, SiO2)

Limestone with Fossil Fragment (Sedimentary carbonate rock (CaCO3)) — sedimentary

Limestone with Fossil Fragment

Sedimentary carbonate rock (CaCO3)

Petrified Wood (Silicified Wood (primarily SiO2 - Silicon Dioxide)) — sedimentary

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Petrified Wood (Silicified Wood (primarily Quartz / Chalcedony: SiO2)) — sedimentary

Petrified Wood

Silicified Wood (primarily Quartz / Chalcedony: SiO2)

Limonite or Ironstone Nodule (FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)) — sedimentary

Limonite or Ironstone Nodule

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

Black tourmaline pendant (Schorl tourmaline, NaFe3Al6(BO3)3Si6O18(OH)4) — mineral

Black tourmaline pendant

Schorl tourmaline, NaFe3Al6(BO3)3Si6O18(OH)4

Polished dark gemstone, likely hematite or magnetite (Hematite (Fe₂O₃) or magnetite (Fe₃O₄); exact identification requires testing) — mineral

Polished dark gemstone, likely hematite or magnetite

Hematite (Fe₂O₃) or magnetite (Fe₃O₄); exact identification requires testing

Garden Pebble (Quartzite or Limestone fragment) (Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) fragment) — sedimentary

Garden Pebble (Quartzite or Limestone fragment)

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) fragment

Obsidian (Obsidian (Volcanic Glass, complex silicate)) — igneous

Obsidian

Obsidian (Volcanic Glass, complex silicate)