Limonite
Limonite (FeOO·nH2O)
mineral
Category
Sedimentary (Biogenic)
Browse sedimentary (biogenic) specimens identified by the Rock Identifier community.
Zoisite with Ruby (Anyolite)
Zoisite – Ca2Al3(SiO4)3(OH) with inclusions of Ruby (Al2O3:Cr)
metamorphic
Selenite (Satin Spar)
Gypsum (CaSO4·2H2O)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Red Jasper (Brecciated Jasper)
SiO2 (Silicon Dioxide) with Ferric Iron inclusions
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Botryoidal Chalcedony
Silicon Dioxide (SiO2)
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Satin Spar Selenite
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Muscovite Schist with Quartz
KAl2(AlSi3O10)(OH)2 in Schistose matrix
metamorphic
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Fossilized Echinoid (Sea Urchin)
Echinoidea (Class), often found as calcitic fossils
sedimentary
Chalcedony (Agate/Chert)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Green Banded Chert (Agate/Jasper)
Silicon Dioxide (SiO2) with trace impurities of Chlorite or Glauconite
sedimentary
Greenstone / Glauconitic Siltstone
Metabasalt or Glauconite-rich Sedimentary Rock
metamorphic or sedimentary
Quartz Vein in Host Rock
Quartz (SiO2) in Mafic or Sedimentary Matrix
igneous
Pumice or Tufa/Travertine
Pumice (if igneous) or Calcareous Tufa (if sedimentary)
igneous/sedimentary
Sandstone (River Pebble)
Arenite (SiO2 based)
sedimentary
Chert (Common Opal variant)
Silicon Dioxide (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Banded Chert (or Banded Jasper)
Silicon Dioxide (SiO2) with Iron Oxide impurities (Hematite/Goethite)
sedimentary
Sandstone (likely Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (Pebble)
Sandstone (arenite, arkose, wacke depending on composition)
sedimentary
Chert
Chert (microcrystalline quartz)
Sedimentary
Cardstock (Paper)
Cellulose (C6H10O5)n
sedimentary (man-made)
Dalmatian Stone
Dalmatian Jasper (Aphanitic Igneous Rock with Arfvedsonite inclusions)
igneous
Chert (Nodular or Fossiliferous)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Chert (Yellow Jasper variant)
Silicon Dioxide (SiO2)
sedimentary
Red Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Quartz Variety)
Chert (Silicon Dioxide, SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony - SiO2)
sedimentary
Green Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Septarian Nodule
Septarian Concretion (Calcium Carbonate/Aragonite/Calcite)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary