Rock Identifier

Category

Organic (Geological Relative)

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

Labradorite (a variety of Feldspar) (Labradorite; (Na,Ca)(Al,Si)4O8 (a plagioclase feldspar)) — igneous

Labradorite (a variety of Feldspar)

Labradorite; (Na,Ca)(Al,Si)4O8 (a plagioclase feldspar)

Rhodonite (Rhodonite (MnSiO3)) — Mineral

Rhodonite

Rhodonite (MnSiO3)

Unakite (Altered Granite (Granitic Metamorphic Rock)) — metamorphic

Unakite

Altered Granite (Granitic Metamorphic Rock)

Olivine (likely Peridot variety) (Olivine Mineral Group (specifically Forsterite-Fayalite solid solution series); Chemical formula: (Mg,Fe)2SiO4) — Mineral

Olivine (likely Peridot variety)

Olivine Mineral Group (specifically Forsterite-Fayalite solid solution series); Chemical formula: (Mg,Fe)2SiO4

Green Calcite (Calcite (CaCO3)) — mineral

Green Calcite

Calcite (CaCO3)

Halite (Halite (Sodium Chloride - NaCl)) — Mineral

Halite

Halite (Sodium Chloride - NaCl)

Basalt (Basalt (dominated by plagioclase feldspar and pyroxene)) — igneous

Basalt

Basalt (dominated by plagioclase feldspar and pyroxene)

Sandstone (Arenite (a specific type of sandstone with less than 15% matrix)) — Sedimentary rock

Sandstone

Arenite (a specific type of sandstone with less than 15% matrix)

Sedimentary rock

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

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Unakite (Epidotized Granite) — metamorphic

Unakite

Epidotized Granite

Chert (Limestone-based) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Limestone-based)

Silicon Dioxide (SiO2)

Leopard Skin Jasper (Chalcedony (cryptocrystalline Quartz)) — Mineral

Leopard Skin Jasper

Chalcedony (cryptocrystalline Quartz)

Gold (Aurum (Au)) — Mineral (Metal)

Gold

Aurum (Au)

Mineral (Metal)

Halite (Halite (NaCl)) — Mineral

Halite

Halite (NaCl)

Rose Quartz (Quartz (SiO₂), specifically a variety of Quartz) — Mineral

Rose Quartz

Quartz (SiO₂), specifically a variety of Quartz

Unakite (Unakite (Epidote-Feldspar rock)) — Metamorphic rock

Unakite

Unakite (Epidote-Feldspar rock)

Metamorphic rock

Coal (most likely Bituminous or Anthracite) (Coal (primarily composed of carbon with varying amounts of other elements)) — Sedimentary rock

Coal (most likely Bituminous or Anthracite)

Coal (primarily composed of carbon with varying amounts of other elements)

Sedimentary rock

Quartzite (Metamorphic Quartzite) — metamorphic

Quartzite

Metamorphic Quartzite

Chert Pebble (Silicon dioxide (SiO2)) — sedimentary

Chert Pebble

Silicon dioxide (SiO2)

Granite (Granite (High-silica plutonic rock)) — igneous

Granite

Granite (High-silica plutonic rock)

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

Chert / Jasper

Silicon Dioxide (SiO2)

Black Tourmaline (Schorl (Na(Fe²⁺)₃Al₆(OH)₄(BO₃)₃Si₆O₁₈)) — Mineral

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(OH)₄(BO₃)₃Si₆O₁₈)

Weathered pink granite cobble (Granite, likely biotite-bearing pink granite; exact variety cannot be confirmed from a photograph) — igneous

Weathered pink granite cobble

Granite, likely biotite-bearing pink granite; exact variety cannot be confirmed from a photograph

Blue Tiger's Eye (Crocidolite (fibrous riebeckite) silicified to Quartz (SiO2)) — Mineral

Blue Tiger's Eye

Crocidolite (fibrous riebeckite) silicified to Quartz (SiO2)

Ruby in Zoisite (Ruby (Corundum, Al2O3) in Zoisite (Calcium aluminum silicate hydroxide, Ca2Al3(SiO4)3(OH)) with some Hornblende) — Metamorphic Rock (specifically a rock composed of minerals)

Ruby in Zoisite

Ruby (Corundum, Al2O3) in Zoisite (Calcium aluminum silicate hydroxide, Ca2Al3(SiO4)3(OH)) with some Hornblende

Metamorphic Rock (specifically a rock composed of minerals)

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

Chert / Jasper

Microcrystalline Quartz (SiO2)

Seashell Fragment (Calcium Carbonate (CaCO3) in the form of Aragonite or Calcite) — mineral

Seashell Fragment

Calcium Carbonate (CaCO3) in the form of Aragonite or Calcite

Chert / Flint (Silicon dioxide (SiO2)) — sedimentary

Chert / Flint

Silicon dioxide (SiO2)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Light Green Quartzite (Metamorphosed Quartz Sandstone (SiO2 with chlorite or mica inclusions)) — metamorphic

Light Green Quartzite

Metamorphosed Quartz Sandstone (SiO2 with chlorite or mica inclusions)

Calcite (Calcium Carbonate (CaCO3)) — mineral

Calcite

Calcium Carbonate (CaCO3)

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

Chert (Jasper variation)

Silicon dioxide (SiO2)

Chert (potentially Flint or Mudstone) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (potentially Flint or Mudstone)

Microcrystalline Quartz (SiO2)

Granite (Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)) — igneous

Granite

Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)

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

Chert (Flint)

Chert (SiO2)

Schist (Mica Schist (Medium-grade metamorphic rock)) — metamorphic

Schist

Mica Schist (Medium-grade metamorphic rock)

Yellow Chert or Jasper (Silicon Dioxide (SiO2)) — sedimentary

Yellow Chert or Jasper

Silicon Dioxide (SiO2)

Fluorite (often referred to casually as 'Fluorspar' in industrial contexts) (Fluorite (CaF2)) — Mineral

Fluorite (often referred to casually as 'Fluorspar' in industrial contexts)

Fluorite (CaF2)

Green Aventurine (Aventurine (Silicon dioxide, SiO₂)) — Mineral; variety of Quartz

Green Aventurine

Aventurine (Silicon dioxide, SiO₂)

Mineral; variety of Quartz

Black Tourmaline (Schorl) (Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3)(OH)3(OH))) — mineral

Black Tourmaline (Schorl)

Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3)(OH)3(OH))