Rock Identifier

Category

Organic (Often Found By Beachcombers)

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

Learn about Organic (Often Found By Beachcombers) in the encyclopedia

Sapropel

Sapropel

Bituminous Shale

Bituminous Shale

Black Shale

Black Shale

Petrified Wood

Petrified Wood

Amber

Amber

Jet

Jet

Peat

Peat

Oil Shale

Oil Shale

Monazite

Monazite

Reptile Jasper

Reptile Jasper

Pearl

Pearl

Pegmatite

Pegmatite

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Glauconitic Sandstone (Glauconitic Sandstone (Greensand)) — sedimentary

Glauconitic Sandstone

Glauconitic Sandstone (Greensand)

Serpentinite (Serpentinite (composed largely of serpentine group minerals including antigorite, lizardite, and chrysotile)) — metamorphic

Serpentinite

Serpentinite (composed largely of serpentine group minerals including antigorite, lizardite, and chrysotile)

Limonite (Iron Stone Concretion) (Limonite (Hydrous Iron Oxide) - FeO(OH)·nH2O) — mineral

Limonite (Iron Stone Concretion)

Limonite (Hydrous Iron Oxide) - FeO(OH)·nH2O

Jasper in Basalt Matrix (Silicon Dioxide (SiO2) with impurities; Chalcedony) — sedimentary (secondary mineral) within igneous

Jasper in Basalt Matrix

Silicon Dioxide (SiO2) with impurities; Chalcedony

sedimentary (secondary mineral) within igneous

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)

Howlite (Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)) — mineral

Howlite

Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)

Banded Quartzite (Quartzite (SiO2 with impurities)) — metamorphic

Banded Quartzite

Quartzite (SiO2 with impurities)

Quartzite pebble (Quartzite (SiO2)) — metamorphic

Quartzite pebble

Quartzite (SiO2)

Arsenopyrite with Quartz (Arsenopyrite (FeAsS)) — mineral

Arsenopyrite with Quartz

Arsenopyrite (FeAsS)

Banded Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Banded Chert

Microcrystalline Quartz (SiO2)

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Selenite / Gypsum (Gypsum (CaSO4·2H2O)) — Mineral

Selenite / Gypsum

Gypsum (CaSO4·2H2O)

Glauconite (Greensand) (Glauconite ((K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)) — sedimentary

Glauconite (Greensand)

Glauconite ((K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Quartzite Cobble (Quartzite (mostly SiO2)) — metamorphic

Quartzite Cobble

Quartzite (mostly SiO2)

Manganese Oxide Crust on Limestone (Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3) — sedimentary

Manganese Oxide Crust on Limestone

Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hematite Concretion (Iron(III) oxide (Fe2O3)) — mineral

Hematite Concretion

Iron(III) oxide (Fe2O3)

Malachite Coating on Host Rock (Malachite [Cu2CO3(OH)2]) — mineral

Malachite Coating on Host Rock

Malachite [Cu2CO3(OH)2]

Limonite (Iron Ore) (Limonite (FeO(OH)·nH2O)) — mineral

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Milky Quartz with Chlorite Schist Inclusions (Quartz (SiO2) with Chlorite Group silicates (typically (Mg,Fe)3(Si,Al)4O10(OH)2)) — metamorphic

Milky Quartz with Chlorite Schist Inclusions

Quartz (SiO2) with Chlorite Group silicates (typically (Mg,Fe)3(Si,Al)4O10(OH)2)

Limonite (often after Hematite or Goethite) (Limonite (FeO(OH)·nH2O)) — mineral

Limonite (often after Hematite or Goethite)

Limonite (FeO(OH)·nH2O)

Slag (Industrial Glass) (Artificial Vitreous Silicate) — mineraloid (anthropogenic)

Slag (Industrial Glass)

Artificial Vitreous Silicate

mineraloid (anthropogenic)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Quartz Pebble (Sea Glass-like texture) (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble (Sea Glass-like texture)

Silicon Dioxide (SiO2)

Sandstone (Quartzose) (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Quartzite cobblestone (Quartzite (primarily SiO2)) — metamorphic

Quartzite cobblestone

Quartzite (primarily SiO2)

Greenstone (Metabasalt / Greenschist facies rock) — metamorphic

Greenstone

Metabasalt / Greenschist facies rock

Chert (Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline Quartz (SiO2)

Howlite (Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)) — Mineral

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Malachite (Copper carbonate hydroxide [Cu2CO3(OH)2]) — mineral

Malachite

Copper carbonate hydroxide [Cu2CO3(OH)2]

Chert pebble (Microcrystalline silica (SiO2)) — sedimentary

Chert pebble

Microcrystalline silica (SiO2)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Picture Jasper (Silicon dioxide (SiO2)) — sedimentary

Picture Jasper

Silicon dioxide (SiO2)

Chert (Common Opal/Jasper transition) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Common Opal/Jasper transition)

Silicon Dioxide (SiO2)

Sodalite (Sodalite (Na8Al6Si6O24Cl2)) — mineral

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

Psilomelane (Black Hematite/Manganese Ore) (Barium Manganese Oxide (Formula: BaMn9O18(OH)4)) — mineral

Psilomelane (Black Hematite/Manganese Ore)

Barium Manganese Oxide (Formula: BaMn9O18(OH)4)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sea Bean (Hamburger Bean) (Mucuna sloanei) — organic/biological specimen

Sea Bean (Hamburger Bean)

Mucuna sloanei

organic/biological specimen