Quartz with Mica and Feldspar
Granitic Pegmatite Fragment (SiO2 + KAlSi3O8 + KAl2(AlSi3O10)(OH)2)
igneous
Category
Sedimentary Or Igneous Fragment
Browse sedimentary or igneous fragment specimens identified by the Rock Identifier community.
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Red sandstone
Quartz-rich sandstone, commonly ferruginous (Fe-oxide stained)
sedimentary
Obsidian
Volcanic Glass
igneous
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Black Obsidian
Volcanic Glass (SiO2 with impurities)
igneous
Metal Chain (Likely Steel or a Steel Alloy)
Steel (primarily iron and carbon); specific alloy unknown
Man-made Object (Metal/Alloy)
Quartz Druzy (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Conglomerate
Clastic sedimentary rock (Puddingstone)
sedimentary
Coquina
Biogenic Limestone (Calcite/Aragonite)
sedimentary
Sandstone (lithic wake/graywacke variety)
Arenite/Greywacke (SiO2 with lithic fragments)
sedimentary
Chert (White Chert / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Conglomerate
Clastic Sedimentary Rock
sedimentary
Chert breccia
Sedimentary Breccia (Microcrystalline Quartz)
sedimentary
Coquina
Coquina (Biogenic Limestone / CaCO3)
sedimentary
Coquina
Biogenic Limestone (Coquina)
sedimentary
Asphalt (Bituminous pavement fragment)
Artificial conglomerate / Bitumen-Aggregate mixture
sedimentary
Fossiliferous Limestone (Shell Fragment)
Biogenic Limestone (Calcium Carbonate / CaCO3)
sedimentary
Fossilized Shark Tooth (Fragment)
Elasmobranchii fossil (likely Cretalamna or Squalicorax genus)
sedimentary
Jasper Breccia
Silicon Dioxide (SiO2) with impurities
sedimentary
Sandstone
Clastic sedimentary rock (primarily quartz arenite)
sedimentary
Sapphire
Corundum (Al2O3)
mineral
Quartz (likely) or a Quartzite Pebble
Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.
Mineral, specifically a detrital grain
Likely tumbled calcite or pale limestone fragment
Calcite (CaCO₃), possibly microcrystalline limestone
mineral
Quartz (Common or Milky)
Silicon Dioxide (SiO2)
mineral
Breciated Chert
Brecciated Chert (Microcrystalline Quartz, SiO2)
sedimentary
Quartz with Epidote
Silicon dioxide (SiO2) with Calcium aluminum iron silicate (Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH))
mineral
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Coprolite
Coprolite (fossilized feces)
fossil
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Sandstone (Common Quartz Pebble/Rock)
Sedimentary rock / Quartz arenite
sedimentary
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Quartz with mica and feldspar (Pegmatite fragment)
Granitic Pegmatite (composed mainly of SiO2 with KAlSi3O8)
igneous
Black Obsidian
Obsidian (Amorphous Silicon Dioxide)
igneous
Obsidian with Matrix
Volcanic Glass (SiO2)
igneous
Jasper Breccia
Brecciated Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
sedimentary
Chondrite Meteorite
Stony Meteorite (Chondrite)
igneous
Jasper and Quartz Breccia
Silicified Breccia / Microcrystalline Quartz
sedimentary
Quartz Druzy on Geode Fragment
Silicon Dioxide (SiO2)
mineral
Coral Rock (Coquina)
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Sandstone
Arenite
sedimentary