Rock Identifier

Category

Organic (Non Geological)

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

Petrified Wood (Silicified wood (Quartz / Chalcedony replacement of organic cellulose)) — fossil

Petrified Wood

Silicified wood (Quartz / Chalcedony replacement of organic cellulose)

Moqui Marble (Iron Concretion) (Goethite/Hematite Cement Sandstone Concretion) — sedimentary

Moqui Marble (Iron Concretion)

Goethite/Hematite Cement Sandstone Concretion

Quartz Geode in Sedimentary Host Rock (Silicon Dioxide (SiO2) in Carbonate Matrix) — sedimentary

Quartz Geode in Sedimentary Host Rock

Silicon Dioxide (SiO2) in Carbonate Matrix

Fossilized Brachiopod (Phylum Brachiopoda (replaced by Calcite/CaCO3)) — sedimentary

Fossilized Brachiopod

Phylum Brachiopoda (replaced by Calcite/CaCO3)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Amethyst Sage Agate (Silicon Dioxide (SiO2) with trace minerals (Manganese/Iron oxides)) — mineral

Amethyst Sage Agate

Silicon Dioxide (SiO2) with trace minerals (Manganese/Iron oxides)

Fossiliferous Limestone (Calcium Carbonate (CaCO3) with organic fossil inclusions) — sedimentary

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with organic fossil inclusions

Clear Quartz (Tumbled) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Tumbled)

Silicon Dioxide (SiO2)

Tumbled Carnelian (Carnelian (Var. of Chalcedony, SiO2)) — mineral

Tumbled Carnelian

Carnelian (Var. of Chalcedony, SiO2)

Note: Item is not a geological specimen (n/a) — none

Note: Item is not a geological specimen

n/a

Crushed Limestone (Calcium Carbonate (CaCO3)) — Sedimentary

Crushed Limestone

Calcium Carbonate (CaCO3)

Quartz on Host Rock (Silicon Dioxide (SiO2)) — mineral

Quartz on Host Rock

Silicon Dioxide (SiO2)

Pearl (Calcium carbonate (CaCO3) + organic conchiolin (Biogenic Mineral)) — mineral

Pearl

Calcium carbonate (CaCO3) + organic conchiolin (Biogenic Mineral)

Petoskey Stone (Hexagonaria percarinata (Fossilized Coral)) — sedimentary

Petoskey Stone

Hexagonaria percarinata (Fossilized Coral)

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

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, SiO2)

Quartz (Silicon dioxide (SiO2)) — mineral

Quartz

Silicon dioxide (SiO2)

Conglomerate (Polymictic Conglomerate) — sedimentary

Conglomerate

Polymictic Conglomerate

Red Sandstone (Arenite (Iron-rich)) — sedimentary

Red Sandstone

Arenite (Iron-rich)

Sandstone with Manganese Dendrites (Arenite (mostly SiO2) with Manganese Oxide inclusions (MnO2)) — sedimentary

Sandstone with Manganese Dendrites

Arenite (mostly SiO2) with Manganese Oxide inclusions (MnO2)

Black Onyx (Chalcedony (SiO2)) — gemstone

Black Onyx

Chalcedony (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

White Quartz (Mushroom Carving) (Quartz (Silicon Dioxide - SiO2)) — mineral

White Quartz (Mushroom Carving)

Quartz (Silicon Dioxide - SiO2)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Weathered fossiliferous limestone fragment, possibly fossil coral or shell material (Indeterminate carbonate fossil in calcitic limestone; likely composed mainly of calcite (CaCO₃), but species identification is not possible from this image alone) — fossil

Weathered fossiliferous limestone fragment, possibly fossil coral or shell material

Indeterminate carbonate fossil in calcitic limestone; likely composed mainly of calcite (CaCO₃), but species identification is not possible from this image alone

Dyed Blue Agate (Dragon Vein Agate) (Silicon Dioxide (SiO2) with artificial cobalt/organic dyes) — mineral

Dyed Blue Agate (Dragon Vein Agate)

Silicon Dioxide (SiO2) with artificial cobalt/organic dyes

Lightning Stone / Fulgurite-impregnated or Septarian-like Agate (Silicon dioxide (Quartz/Chalcedony) with host rock matrix) — sedimentary

Lightning Stone / Fulgurite-impregnated or Septarian-like Agate

Silicon dioxide (Quartz/Chalcedony) with host rock matrix

Quartzite Pebble (Quartzite (SiO2)) — metamorphic

Quartzite Pebble

Quartzite (SiO2)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Calcite (Calcite (CaCO3)) — Mineral

Calcite

Calcite (CaCO3)

Petrified Wood (Silicified wood (primarily quartz replacing organic cellulose)) — fossil

Petrified Wood

Silicified wood (primarily quartz replacing organic cellulose)

Red Sandstone (Ferruginous Sandstone (SiO2 with Iron Oxide)) — sedimentary

Red Sandstone

Ferruginous Sandstone (SiO2 with Iron Oxide)

Sandstone Geode (Sedimentary Geode (Silica/Calcite composition)) — sedimentary

Sandstone Geode

Sedimentary Geode (Silica/Calcite composition)

Fossiliferous Sandstone (with Brachiopod or Bivalve mold) (Clastic Sedimentary Rock with Macrofossil Mold) — sedimentary

Fossiliferous Sandstone (with Brachiopod or Bivalve mold)

Clastic Sedimentary Rock with Macrofossil Mold

Picture Jasper (Silicon Dioxide (SiO2) with iron oxide and organic impurities) — sedimentary

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide and organic impurities

Gastropod Fossil (Snail Internal Cast) (Class Gastropoda (Steinkern)) — sedimentary

Gastropod Fossil (Snail Internal Cast)

Class Gastropoda (Steinkern)

Sandstone Pebble (Arenite (SiO2 based)) — sedimentary

Sandstone Pebble

Arenite (SiO2 based)

Diamond Plate (Steel) (Alloyed Carbon Steel or Aluminum with 'Durbar' pattern) — not a rock (Man-made industrial metal)

Diamond Plate (Steel)

Alloyed Carbon Steel or Aluminum with 'Durbar' pattern

not a rock (Man-made industrial metal)

Sandstone (Clastic Sedimentary Rock) — sedimentary

Sandstone

Clastic Sedimentary Rock

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

Quartz (Milky/Snow)

Silicon Dioxide (SiO2)

Chalky Limestone (Carbonate sedimentary rock (CaCO3)) — sedimentary

Chalky Limestone

Carbonate sedimentary rock (CaCO3)

Fossilized Coral (Petrified Coral) (Anthozoa (Scleractinia)) — sedimentary

Fossilized Coral (Petrified Coral)

Anthozoa (Scleractinia)