Grass (Organic Matter/Soil)
Poaceae (family of monocotyledonous flowering plants)
Organic Materia (Not a rock or mineral)
Category
Mineral, Often Found As A Rock
Browse mineral, often found as a rock specimens identified by the Rock Identifier community.
Gold-bearing Quartz with Iron Oxides
Quartz (SiO2) with Limonite/Goethite (FeO(OH)) and Pyrite (FeS2)
mineral
Chert (Red/Brown Variety)
Microcrystalline quartz (SiO2)
sedimentary
White Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzite Pebble)
Arenite (primarily SiO2)
sedimentary
Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Milky Quartz with Mineral Inclusions
Silicon Dioxide (SiO2) with miscellaneous inclusions
mineral
Granite Sand (Decomposed Granite)
Grus / Quartz-Feldspar Detritus
sedimentary
Lapis Lazuli
Lapis Lazuli (A complex rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Quartzite (River Stone)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Limonite (after Pyrite Pseudomorph)
Limonite (Hydrated Iron Oxide Mixture, FeO(OH)·nH2O)
mineral
Chert (including varieties like Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone
Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)
Sedimentary
Sandstone
Arenite
sedimentary
Chert (Gravel)
Silicon Dioxide (SiO2)
sedimentary
Ironstone Concretion (Ironstone Gourd)
Limonite/Goethite Concretion (FeOO(H))
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Bauxite
Bauxite (Mixture including Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))
sedimentary
Gold Ore in Quartz/Schist
Auriferous Quartz and Sulfide-bearing Schist
Metamorphic/Igneous (Hydrothermal)
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Sandstone (Fossiliferous)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Sandstone or Limestone
Arenite or Calcareous Sedimentary Rock
Sedimentary
Geode (Unopened)
Silicon Dioxide (SiO2) in sedimentary vugs
sedimentary
Drill Core Sample
Cylindrical Rock Core (Specific mineralogy varies by extraction site)
Metamorphic (Likely Gneiss or Schist based on texture)
Sandstone (River Rock)
Arenite (composed primarily of SiO2)
sedimentary
Chert (Flint Nobule)
Silicon Dioxide (SiO2)
sedimentary
Jasper in Basalt Matrix
Silicon Dioxide (SiO2) with impurities; Chalcedony
sedimentary (secondary mineral) within igneous
Sandstone
Arenite (Sedimentary Rock)
sedimentary
Banded Sandstone
Arenite with Liesegang banding (primarily SiO2 with FeO(OH) impurities)
sedimentary
Lapis Lazuli
Lapis Lazuli (Complex aggregate mainly of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony / Quartz Variety
Mineral
Hematite Nodules (Moqui Marbles style)
Iron Oxide (Fe2O3)
mineral
Fancy Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Sandstone (Banded)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Banded Quartz
Silicon Dioxide (SiO2)
mineral
Diorite
Diorite (an intrusive igneous rock)
igneous
Sandstone (with potential fossil inclusions)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary