Gneiss
Gneiss
metamorphic
Category
Mineral Within Sedimentary Rock
Browse mineral within sedimentary rock specimens identified by the Rock Identifier community.
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Jasper (likely Ocean Jasper or Variegated Jasper)
Silicon Dioxide (SiO2) with impurities
sedimentary
Weathered granitic rock
Granite or granodiorite; mainly quartz, feldspar, and mica/amphibole
igneous
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Glauconite (Green Sandstone)
Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2
sedimentary
Jasper with Dendritic Inclusions
Microcrystalline Quartz (SiO2) with manganese or iron oxide inclusions
sedimentary
Carnelian
Carnelian (Silicon Dioxide - SiO2)
mineral
Glauconitic Sandstone
Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)
sedimentary
Banded gneiss pebble
Biotite–quartz–feldspar gneiss (composition variable)
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2) with Iron Hydroxide inclusions
mineral
Ironstone Concretion
Ferruginous Sandstone / Siderite Concretion
sedimentary
Chert
Silicon dioxide (SiO2)
Sedimentary
Chert (Agatized)
Silicon dioxide (SiO2)
sedimentary
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Citrine Geode
Silicon Dioxide (Quartz variety, often heat-treated amethyst): SiO2
mineral
Granitic Gneiss Pebble
Gneiss (felsic metamorphic rock)
metamorphic
Chert
Microcrystalline or cryptocrystalline quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Gneiss (with iron staining)
Gneiss
metamorphic
Chert (Tan/Yellow variety)
Microcrystalline quartz (SiO2)
sedimentary
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Chert (and Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert Nodules in Sedimentary Rock
Microcrystalline Quartz (SiO2) within Clastic Matrix
sedimentary
Chert (and/or Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Ironstone Concretion / Goethite-Hematite Geode
Goethite / Hematite Concretion (Fe3O4 / FeO(OH) / Fe2O3)
sedimentary
Banded Flint (Polished Stripe Flint)
Silicon Dioxide (SiO2) - variety of Chert
sedimentary
Himalayan Pink Salt
Halite (NaCl) with iron oxide inclusions
sedimentary
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Siltstone with Iron Staining
Siltstone (primarily SiO2 with Fe2O3 staining)
sedimentary
Conglomerate
Clastic sedimentary rock (Psephite)
sedimentary
Conglomerate (Puddingstone)
Conglomerate (specifically, clastic sedimentary rock)
Sedimentary
Fairburn Agate
Cryptocrystalline Quartz (SiO2) with trace Iron Oxides
mineral
River Chalcedony / Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Agate (Chalcedony)
Cryptocrystalline Silica or Silicon Dioxide (SiO2)
mineral
Chalcedony in Matrix
Silicon Dioxide (SiO2)
mineral
Flint
SiO2 (Microcrystalline Quartz / Chert)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in a Secondary Sedimentary/Volcanic cavity
mineral
Sandstone (likely Arkosic or Quartzose)
Sandstone (SiO2 with inclusions)
sedimentary
Sandstone Concretion
Clastic sedimentary rock (primarily Silica, SiO2, or Calcium Carbonate, CaCO3)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminum; CuAl6(PO4)4(OH)8·4H2O
mineral