Rock Identifier

Category

Biogenic Material

Browse biogenic material specimens identified by the Rock Identifier community.

Learn about Biogenic Material in the encyclopedia

Peat

Diatomite

Dunite

Limonite

Diamond

Peacock Opal

Metarhyolite

Rhodochrosite

Shell Opal

Madagascar Opal

Lavender Obsidian

Electric Blue Obsidian

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

Chert / Jasper

Microcrystalline Quartz (SiO2)

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

Chert (Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert / Microcrystalline Quartz (Silicon Dioxide (SiO2)) — sedimentary

Chert / Microcrystalline Quartz

Silicon Dioxide (SiO2)

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

Chert / Jasper

Microcrystalline Quartz (SiO2)

Diamond (in Jewelry Setting) (Carbon (C) - Isometric-Hexoctahedral) — mineral

Diamond (in Jewelry Setting)

Carbon (C) - Isometric-Hexoctahedral

Chert (Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Flint)

Silicon Dioxide (SiO2)

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

Chert (Jasper/Chalcedony)

Microcrystalline Quartz (SiO2)

Aragonite Star Cluster (Aragonite (CaCO3)) — mineral

Aragonite Star Cluster

Aragonite (CaCO3)

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

Weathered quartz-rich rock, possibly quartzite or quartz vein material (Quartz (SiO₂), likely with feldspar, mica, and iron-oxide staining) — metamorphic

Weathered quartz-rich rock, possibly quartzite or quartz vein material

Quartz (SiO₂), likely with feldspar, mica, and iron-oxide staining

Jasper (Silicon Dioxide (Microcrystalline Quartz, SiO2)) — mineral

Jasper

Silicon Dioxide (Microcrystalline Quartz, SiO2)

Jasper (Silicon dioxide (Microcrystalline Quartz, SiO2)) — sedimentary

Jasper

Silicon dioxide (Microcrystalline Quartz, SiO2)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Tumbled Red Jasper (Quartz (Microcrystalline variety of chalcedony, SiO2)) — mineral

Tumbled Red Jasper

Quartz (Microcrystalline variety of chalcedony, SiO2)

Fossil Shark Tooth (Selachii fossil) — fossil

Fossil Shark Tooth

Selachii fossil

Jasper (Microcrystalline quartz (SiO2)) — sedimentary

Jasper

Microcrystalline quartz (SiO2)

Mammoth Tooth (Mammuthus tooth) — fossil

Mammoth Tooth

Mammuthus tooth

Fossilized Horse Tooth (Equus sp. (Tooth)) — fossil

Fossilized Horse Tooth

Equus sp. (Tooth)

Jasper (Silicon Dioxide (Microcrystalline Quartz, $SiO_2$)) — sedimentary

Jasper

Silicon Dioxide (Microcrystalline Quartz, $SiO_2$)

Jasper (Microcrystalline quartz (SiO2)) — sedimentary

Jasper

Microcrystalline quartz (SiO2)

Jasper (Microcrystalline Quartz (Chalcedony), SiO2) — sedimentary

Jasper

Microcrystalline Quartz (Chalcedony), SiO2

Poppy Jasper (Microcrystalline Quartz (SiO2) with hematite and other inclusions) — sedimentary

Poppy Jasper

Microcrystalline Quartz (SiO2) with hematite and other inclusions

Fossilized Oyster Shell (Ostrea / Exogyra (Phylum Mollusca)) — fossil

Fossilized Oyster Shell

Ostrea / Exogyra (Phylum Mollusca)

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

Jasper

Silicon Dioxide (SiO2) with impurities

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

Sandstone

Arenite (SiO2 composed primarily of quartz)

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

Chert / Flint

Silicon dioxide (SiO2)

Chert Nodules in Limestone (Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)) — sedimentary

Chert Nodules in Limestone

Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)

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

Chert (Yellow Jasper variant)

Silicon Dioxide (SiO2)

Chert (Silicon dioxide (SiO2)) — Sedimentary

Chert

Silicon dioxide (SiO2)

Cullet Glass (Slag Glass) (Amorphous Silicon Dioxide (SiO2) with metallic oxide impurities) — mineraloid

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (SiO2) with metallic oxide impurities

Chert (Arrowhead) (Chert (SiO2)) — sedimentary

Chert (Arrowhead)

Chert (SiO2)

Yellow Ochre / Limonite (Limonite (inter-mixed iron oxides and hydroxides, primarily FeO(OH)·nH2O)) — mineral

Yellow Ochre / Limonite

Limonite (inter-mixed iron oxides and hydroxides, primarily FeO(OH)·nH2O)

Chert (Flint Nodules) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Flint Nodules)

Microcrystalline quartz (SiO2)

Slag (Industrial Byproduct) (Artificial silicate/iron byproduct) — Mineral description (Anthropogenic material)

Slag (Industrial Byproduct)

Artificial silicate/iron byproduct

Mineral description (Anthropogenic material)

Limonite (Iron Ore Congcretion) (Limonite (a mixture of hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)) — mineral

Limonite (Iron Ore Congcretion)

Limonite (a mixture of hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)

Carved Gemstone Mushroom (Quartz / Feldspar composite (Carved lapidary art)) — gemstone

Carved Gemstone Mushroom

Quartz / Feldspar composite (Carved lapidary art)

Fossilized Coral (Rugose coral / Tabulate coral fossil in limestone matrix) — fossil

Fossilized Coral

Rugose coral / Tabulate coral fossil in limestone matrix

Crushed Stone (Gravel/Aggregates) (Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)) — sedimentary and igneous (mixed)

Crushed Stone (Gravel/Aggregates)

Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)

sedimentary and igneous (mixed)

Vuggy Quartz on Matrix (Silicon Dioxide (SiO2)) — mineral

Vuggy Quartz on Matrix

Silicon Dioxide (SiO2)

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Yellow chalcedony (likely citrine or iron-stained quartz) (Microcrystalline quartz, SiO₂; yellow coloration likely from iron oxides or included quartz varieties) — mineral

Yellow chalcedony (likely citrine or iron-stained quartz)

Microcrystalline quartz, SiO₂; yellow coloration likely from iron oxides or included quartz varieties