Pyrite
Iron Sulfide (FeS2)
mineral
Category
Mineral, Often Found As Detrital Grains In Sedimentary Rocks
Browse mineral, often found as detrital grains in sedimentary rocks specimens identified by the Rock Identifier community.
Limestone with Algal/Lichen Colonization
Calcium Carbonate (CaCO3)
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Satin Spar (Gypsum)
Hydrous Calcium Sulfate (CaSO4·2H2O)
mineral
River Siltstone / Mudstone Pebble
Siltstone (composed of mixed silicate and carbonate minerals)
sedimentary
Mixed collection of minerals and rocks (Jasper, Carnelian, Granite, and Quartz)
Silicon Dioxide (SiO2) with varying impurities for silicates and igneous aggregates
igneous, sedimentary, and metamorphic
Red Quartzite
Quartzite (primarily SiO2 with hematite inclusions)
metamorphic
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 with assorted lithic fragments)
sedimentary
Chert (Light Grey / Flint variant)
Cryptocrystalline Quartz (SiO2)
sedimentary
Dendritic Agate
Silicon Dioxide (SiO2) with manganese/iron inclusions
mineral
Hypersthene
Hypersthene ((Mg,Fe)SiO₃)
Mineral
Quartz Geode/Cluster
Quartz (SiO2)
mineral
Dyed Pink Agate Slice
Cryptocrystalline variety of Quartz (SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
Sedimentary
Breccia
Clastic Breccia (SiO2/CaCO3 dominated)
sedimentary
Dyed Agate
Silicon Dioxide (SiO2)
mineral
Quartzite (Yellow/Tan river stone variety)
Quartzite (primarily SiO2)
metamorphic
Coarse-grained Granite
Phaneritic Granite (contains Quartz, Feldspar, and Mica)
igneous
Banded Gneiss
Gneiss (complex metamorphic silicate rock)
metamorphic
Chert (Jasper)
Silicon Dioxide (SiO2) with impurities
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Hypersthene
Enstatite (Hypersthene variety), (Mg,Fe)SiO3
mineral
Petrified Wood
Silicified Wood (SiO2 - Quartz/Chalcendony replacing organic matter)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Agate (various color varieties)
SiO₂ (Silicon Dioxide)
Mineral (specifically a variety of Chalcedony, which is a microcrystalline quartz)
Soapstone
Steatite (primarily composed of Talc, Mg₃Si₄O₁₀(OH)₂)
Metamorphic Rock
Brown Jasper
Jasper (a cryptocrystalline variety of Quartz, SiO2)
Mineral, specifically a variety of Quartz
Chert (specifically Agate/Jasper variety)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Banded Gneiss (River Cobble)
Gneiss (a high-grade metamorphic rock)
metamorphic
Flint (within Limestone matrix)
Silicon dioxide (SiO2)
sedimentary
River Pebble (Quartzite/Sandstone mix)
Quartzite (primarily SiO2)
metamorphic
Bauxite
Bauxite (Mixture of Hydrous Aluminum Oxides)
sedimentary
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Pyrite in Shale
Iron Sulfide (FeS2) in Argillaceous Shale
sedimentary
Bauxite
Hydrated Aluminum Oxides (primarily Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral