Red Sandstone
Arenite (Fe2O3-rich)
sedimentary
Category
Sedimentary Rock (Technically A Variety Of Chalcedony)
Browse sedimentary rock (technically a variety of chalcedony) specimens identified by the Rock Identifier community.
Shale
Fissile Siliciclastic Sedimentary Rock
sedimentary
Shale
Shale (clastic sedimentary rock)
Sedimentary
Agate (Moss or Dendritic Agate)
Chalcedony (Silicon Dioxide, SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Pink Chalcedony
Silicon Dioxide (SiO2)
mineral
Quartz (variety of colors)
SiO2 (Silicon Dioxide)
Mineral
Lapis Lazuli
Sodalite-rich metamorphic rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Chert (Cherty Flint/Jasper variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chalcedony (Tumbled)
Silicon Dioxide (SiO2)
mineral
Chert (Jasper/Ironstone variety)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Chert (or possibly Flint)
SiO2 (Silicon Dioxide)
Sedimentary Rock
Sandstone Chert Concretion
Silica-cemented Concretion (primarily SiO2)
sedimentary
Yellow Jade (Yellow Chalcedony/Quartz)
Silicon Dioxide (SiO2)
mineral
Dendritic Agate
Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)
mineral
White Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Agate (Chert/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz (various varieties)
SiO₂ (Silicon Dioxide)
Mineral
Muscovite Mica
Muscovite (Potassium Aluminum Silicate Hydroxide Fluoride), KAl2(AlSi3O10)(OH,F)2
mineral
Chert (River Pebble)
Microcrystalline quartz (SiO2)
sedimentary
Quartz (likely tumbled or naturally water-worn)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Chert (Green variety)
Microcrystalline Opaline/Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Blue Lace Agate
Silicon Dioxide (SiO2)
mineral
Red Quartz (Druzy)
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Chert (variations include Flint/Chalcedony)
Chert (SiO2 - Silicon Dioxide)
sedimentary
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Serpentine
Serpentine Group (primarily Antigorite or Lizardite), Mg3Si2O5(OH)4
metamorphic
Jasper (specifically Bloodstone or Heliotrope variety)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary (chemically precipitated)
Puddingstone (Jasper Conglomerate)
Conglomerate (specific type: Jasper Conglomerate or Hertfordshire Puddingstone)
Sedimentary
Carnelian
Carnelian (SiO2)
mineral
Dalmatian Stone
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Peach Aventurine
Quartz variety (SiO2 + Hematite/Goethite inclusions)
mineral
Chert (often called Flint or Chalcedony Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variety) with Iron Oxide staining
Cryptocrystalline Quartz (SiO2) with Goethite/Limonite impurities
sedimentary
Quartz
Quartz (SiO₂)
Mineral
Chalcedony (Agate/Carnelian type)
Silicon Dioxide (SiO2)
mineral
Chert (includes Flint & Jasper)
Chert (Siliceous sedimentary rock, chemical formula SiO2)
sedimentary
Serpentinite
Serpentinite (complex silicate minerals including lizardite, chrysotile, and antigorite: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Quartz with Chalcedony
Silicon dioxide (SiO2)
mineral
Chert Nodule (with Ironstone Cortex)
Microcrystalline Silica (SiO2)
sedimentary