Rock Identifier

Category

Sedimentary Or Igneous Fragment

Browse sedimentary or igneous fragment specimens identified by the Rock Identifier community.

Learn about Sedimentary Or Igneous Fragment in the encyclopedia

Breccia

Fossiliferous Limestone

Fossiliferous Limestone

Oregon Opal

Orendite

Orthoclase

Orca Agate

Orange Opal

Peacock Ore

Orange Garnet

Orange Obsidian

Orange Calcite

Orange Tourmaline

Orange Tourmaline

Tumbled or naturally etched mica-rich mineral specimen, likely muscovite (Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂; possibly phlogopite mica) — mineral

Tumbled or naturally etched mica-rich mineral specimen, likely muscovite

Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂; possibly phlogopite mica

Fossiliferous Limestone (Calcareous Sedimentary Rock (CaCO3)) — sedimentary

Fossiliferous Limestone

Calcareous Sedimentary Rock (CaCO3)

Fossiliferous Chert (Silicon Dioxide (SiO2) with fossil inclusions) — sedimentary

Fossiliferous Chert

Silicon Dioxide (SiO2) with fossil inclusions

Conglomerate (Polymictic Conglomerate) — sedimentary

Conglomerate

Polymictic Conglomerate

Rounded gray stone, likely slate or fine-grained sandstone (Probable slate (low-grade metamorphosed shale) or lithic sandstone; exact identification requires testing) — sedimentary

Rounded gray stone, likely slate or fine-grained sandstone

Probable slate (low-grade metamorphosed shale) or lithic sandstone; exact identification requires testing

Petrified Wood Fragment (Silicified Wood (SiO2)) — fossil

Petrified Wood Fragment

Silicified Wood (SiO2)

Limestone with Fossil Fragment (Sedimentary carbonate rock (CaCO3)) — sedimentary

Limestone with Fossil Fragment

Sedimentary carbonate rock (CaCO3)

Quartz (Quartz (Silicon Dioxide - SiO2)) — Mineral

Quartz

Quartz (Silicon Dioxide - SiO2)

Pale limestone (Limestone, predominantly calcite (CaCO₃)) — sedimentary

Pale limestone

Limestone, predominantly calcite (CaCO₃)

Flint or chert (Microcrystalline quartz (SiO₂), commonly with chalcedony) — sedimentary

Flint or chert

Microcrystalline quartz (SiO₂), commonly with chalcedony

Quartz Geode Fragment (Silicon Dioxide (SiO2)) — mineral

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Quartz Geode Fragment (Silicon Dioxide (SiO2)) — mineral

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Quartz Geode Fragment (Silicon Dioxide (SiO2)) — sedimentary

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Quartz Geode Fragment (Silicon Dioxide (SiO2)) — mineral

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Chalcedony (Agate nodule fragment) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Agate nodule fragment)

Silicon Dioxide (SiO2)

Quartz / Chalcedony Geode Fragment (Silicon Dioxide (SiO2)) — mineral

Quartz / Chalcedony Geode Fragment

Silicon Dioxide (SiO2)

Quartz with Calcite / Geode Fragment (Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3)) — mineral

Quartz with Calcite / Geode Fragment

Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3)

Iron-rich chert or jasper fragment (Microcrystalline quartz (SiO₂), commonly hematite/goethite-bearing) — sedimentary

Iron-rich chert or jasper fragment

Microcrystalline quartz (SiO₂), commonly hematite/goethite-bearing

Granitic Pegmatite (River Rock specimen) (Granite / Pegmatite (composed of SiO2, KAlSi3O8, and NaAlSi3O8)) — igneous

Granitic Pegmatite (River Rock specimen)

Granite / Pegmatite (composed of SiO2, KAlSi3O8, and NaAlSi3O8)

Rounded quartz-rich river pebble (Quartz-rich sandstone or quartzite; chiefly silicon dioxide (SiO₂)) — sedimentary

Rounded quartz-rich river pebble

Quartz-rich sandstone or quartzite; chiefly silicon dioxide (SiO₂)

Quartz Geode fragment (Crystalline Silicon Dioxide (SiO2)) — mineral

Quartz Geode fragment

Crystalline Silicon Dioxide (SiO2)

Quartz Geode Fragment (Silicon Dioxide (SiO2)) — mineral

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Unidentified small rocks or gravel — sedimentary

Unidentified small rocks or gravel

Chert (Tan/Grey variety) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Tan/Grey variety)

Silicon Dioxide (SiO2)

Bronzite-bearing gabbro (likely norite) (Norite/gabbro: plagioclase feldspar + orthopyroxene (bronzite), commonly with minor olivine, magnetite, or biotite) — igneous

Bronzite-bearing gabbro (likely norite)

Norite/gabbro: plagioclase feldspar + orthopyroxene (bronzite), commonly with minor olivine, magnetite, or biotite

Weathered limestone fragment (Calcitic limestone (mostly CaCO₃; possibly micritic limestone)) — sedimentary

Weathered limestone fragment

Calcitic limestone (mostly CaCO₃; possibly micritic limestone)

Limestone with Fossil Fragment (Bioclastic limestone (Calcium carbonate, CaCO3)) — sedimentary

Limestone with Fossil Fragment

Bioclastic limestone (Calcium carbonate, CaCO3)

Chert or flint fragment (Microcrystalline quartz (SiO₂), commonly chalcedony with possible clay/iron-oxide impurities) — sedimentary

Chert or flint fragment

Microcrystalline quartz (SiO₂), commonly chalcedony with possible clay/iron-oxide impurities

Quartz Geode Fragment (Silicon Dioxide (SiO2)) — sedimentary

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Oolite or Oolitic Limestone (Oolitic Limestone (Principal mineral: Calcite, CaCO3)) — sedimentary

Oolite or Oolitic Limestone

Oolitic Limestone (Principal mineral: Calcite, CaCO3)

Chert (Gravel Fragment) (Silicon dioxide (SiO2)) — sedimentary

Chert (Gravel Fragment)

Silicon dioxide (SiO2)

Fossilized Bone Fragment (Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)) — sedimentary

Fossilized Bone Fragment

Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)

Crinoid Stem Fragment (Crinoid (Phylum Echinodermata, Class Crinoidea)) — sedimentary

Crinoid Stem Fragment

Crinoid (Phylum Echinodermata, Class Crinoidea)

Coquina with Shell Fragment (Bioclastic Limestone (composed primarily of CaCO3)) — sedimentary

Coquina with Shell Fragment

Bioclastic Limestone (composed primarily of CaCO3)

Fossilized Bone Fragment (Permineralized Skeletal Element (Likely Vertebrate)) — sedimentary

Fossilized Bone Fragment

Permineralized Skeletal Element (Likely Vertebrate)

Selenite gypsum (Gypsum, CaSO₄·2H₂O (selenite variety)) — mineral

Selenite gypsum

Gypsum, CaSO₄·2H₂O (selenite variety)

Weathered basalt (likely vesicular basalt) (Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine) — igneous

Weathered basalt (likely vesicular basalt)

Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine

Fossiliferous Limestone (Biogenic Sedimentary Rock) — sedimentary

Fossiliferous Limestone

Biogenic Sedimentary Rock

Conglomerate Pebble (with Chert / Quartz) (Sedimentary Conglomerate / Breccia Pebble) — sedimentary

Conglomerate Pebble (with Chert / Quartz)

Sedimentary Conglomerate / Breccia Pebble

Crinoidean Fossil (Stem Fragment) (Phylum Echinodermata, Class Crinoidea) — fossil

Crinoidean Fossil (Stem Fragment)

Phylum Echinodermata, Class Crinoidea

Volcanic Tuff (Breccia) (Pyroclastic Tuffaceous Rock) — igneous

Volcanic Tuff (Breccia)

Pyroclastic Tuffaceous Rock

Amethyst (Geode Fragment) (Silicon Dioxide (SiO2 with iron impurities)) — mineral

Amethyst (Geode Fragment)

Silicon Dioxide (SiO2 with iron impurities)