Rock Identifier

Category

Organic (Often Found By Beachcombers)

Browse organic (often found by beachcombers) specimens identified by the Rock Identifier community.

Magnetic Hematite (Magnetized Hematite (an iron oxide mineral, Fe2O3, that has undergone magnetization)) — Mineral

Magnetic Hematite

Magnetized Hematite (an iron oxide mineral, Fe2O3, that has undergone magnetization)

Man-made Slag (Industrial Byproduct) (Anthropogenic Glassy Residue) — not a natural rock

Man-made Slag (Industrial Byproduct)

Anthropogenic Glassy Residue

not a natural rock

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Chert (Red/Brown Variety) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Red/Brown Variety)

Microcrystalline quartz (SiO2)

Quartzite Pebble (Quartzite (primarily SiO2)) — metamorphic

Quartzite Pebble

Quartzite (primarily SiO2)

Chrysocolla in Matrix (Hydrated copper silicate - (Cu,Al)2H2Si2O5(OH)4·nH2O) — mineral

Chrysocolla in Matrix

Hydrated copper silicate - (Cu,Al)2H2Si2O5(OH)4·nH2O

Purple Lepidolite with Quartz (Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)) — mineral

Purple Lepidolite with Quartz

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

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Quartzite Pebbler (Quartzite (primarily SiO2)) — metamorphic

Quartzite Pebbler

Quartzite (primarily SiO2)

Chert (specifically Yellow or River Chert) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (specifically Yellow or River Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Serpentinite (Serpentinite (Mg, Fe, Ni, Al, Zn)2-3(Si, Al, Fe)2O5(OH)4) — metamorphic

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn)2-3(Si, Al, Fe)2O5(OH)4

Quartzite (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite

Metamorphic Quartzite (SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Amber (Succinite) — Organic Mineraloid

Amber

Succinite

Organic Mineraloid

Amber (Succinite (a specific high-quality amber from the Baltic)) — Organic Mineraloid

Amber

Succinite (a specific high-quality amber from the Baltic)

Organic Mineraloid

Botryoidal Goethite (Goethite (α-Fe3+O(OH))) — mineral

Botryoidal Goethite

Goethite (α-Fe3+O(OH))

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

Quartzite with Iron Inclusions (Metamorphic Silicon Dioxide (SiO2) with impure Limonite/Hematite) — metamorphic

Quartzite with Iron Inclusions

Metamorphic Silicon Dioxide (SiO2) with impure Limonite/Hematite

Arsenopyrite (Arsenopyrite (FeAsS)) — mineral

Arsenopyrite

Arsenopyrite (FeAsS)

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

Jasper

Silicon dioxide (SiO2) with impurities

Pearl (Cultured or Natural) (Aragonite (CaCO3) with Conchiolin) — Organic Mineraloid

Pearl (Cultured or Natural)

Aragonite (CaCO3) with Conchiolin

Organic Mineraloid

Rhodonite (Manganese Silicate (Mn,Fe,Mg,Ca)SiO3) — mineral

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Quartzite with Mica schist fragment (Quartzite (SiO2) with Muscovite/Biotite Schist) — metamorphic

Quartzite with Mica schist fragment

Quartzite (SiO2) with Muscovite/Biotite Schist

Amber (Succinite (Fossilized Tree Resin)) — mineral

Amber

Succinite (Fossilized Tree Resin)

Green Aventurine (Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)) — mineral

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

Chert (with small quartz inclusion) (Microcrystalline Silica (SiO2)) — sedimentary

Chert (with small quartz inclusion)

Microcrystalline Silica (SiO2)

Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)) — mineral

Fuchsite

K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)

Red Quartzite (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Red Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Azurite and Malachite on Matrix (Cu3(CO3)2(OH)2 (Azurite) and Cu2CO3(OH)2 (Malachite)) — mineral

Azurite and Malachite on Matrix

Cu3(CO3)2(OH)2 (Azurite) and Cu2CO3(OH)2 (Malachite)

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

Chert / Pink Chert

Silicon Dioxide (SiO2)

Ruby in Kyanite (Al2O3 (Corundum) in Al2SiO5 (Kyanite-Fuchsite-Quartz)) — metamorphic

Ruby in Kyanite

Al2O3 (Corundum) in Al2SiO5 (Kyanite-Fuchsite-Quartz)

Aquamarine (Beryl (Be3Al2Si6O18 with iron impurities)) — mineral

Aquamarine

Beryl (Be3Al2Si6O18 with iron impurities)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Amethyst on Agate/Basalt Matrix (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst on Agate/Basalt Matrix

Silicon Dioxide (SiO2) with iron impurities

Sandstone (Arenite (SiO2 based with various mineral cements)) — sedimentary

Sandstone

Arenite (SiO2 based with various mineral cements)

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

Lepidolite

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

Quartzite River Rock (Quartzite (primarily SiO2)) — metamorphic

Quartzite River Rock

Quartzite (primarily SiO2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Chrysocolla (Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)) — mineral

Chrysocolla

Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Sodalite (Sodalite - Na8(Al6Si6O24)Cl2) — Mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

Botryoidal Hematite (Kidney Ore) (Hematite (Fe2O3)) — mineral

Botryoidal Hematite (Kidney Ore)

Hematite (Fe2O3)