Quartz with Inclusions
Silicon Dioxide (SiO2)
mineral
Category
Mineral (Sedimentary Context)
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Ironstone (iron-oxide-rich rock)
Ferruginous sandstone or ironstone; likely composed chiefly of goethite and/or limonite, with quartz and clay
sedimentary
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Limestone (or Sandstone)
Calcium Carbonate (CaCO3) / Silica (SiO2)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone
Arenite (SiO2 with various cementing minerals)
sedimentary
Milky quartz crystal cluster
Quartz (silicon dioxide, SiO₂)
mineral
Limonite
Limonite (Hydrous iron oxides, predominantly Goethite FeO(OH)·nH2O)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Sandstone (Picture Sandstone)
Arenite (primarily SiO2)
sedimentary
Sandstone and Gravel Aggregate
Clastic Sedimentary Rock / Quartzose Sandstone
sedimentary
Rounded, foliated metamorphic pebble (likely schist)
Mica schist, composition uncertain from the image
metamorphic
Agate / Chalcedony Geode
Silicon Dioxide (SiO2)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Small weathered mineral/rock fragment
Indeterminate; possibly quartz-bearing feldspathic rock or calcite-rich specimen
mineral
Red Jasper and Hematite
Silicon Dioxide (SiO2) and Iron Oxide (Fe2O3)
mineral
Fluorite, Turquoise, and Calcite set
Calcium Fluoride (CaF2), Hydrous Phosphate of Copper and Aluminum (CuAl6(PO4)4(OH)8·4H2O), Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Manganese Ore (Psilomelane/Pyrolusite)
Psilomelane ((Ba,H2O)2Mn5O10) and Pyrolusite (MnO2)
Mineral
Quartz Geode
Silicon Dioxide (SiO2) in Host Rock
sedimentary
Felsic gneiss, likely granitic gneiss
Quartz–feldspar–mica gneiss; commonly quartz + plagioclase/K-feldspar + biotite or hornblende
metamorphic
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz Geode with Calcite
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)
mineral
Sphalerite
Zinc Sulfide (ZnS)
mineral
Banded Iron Formation
Banded Iron Formation (BIF)
sedimentary
Limonite Concretion
Limonite (Hydrated iron(III) oxide-hydroxide) FeO(OH)·nH2O
sedimentary
Quartz on Sandstone
Silicon Dioxide (SiO2) in Lithic Sandstone
sedimentary
Limonite / Ironstone Nodule
Limonite (Hydrated iron(III) oxide-hydroxide), FeO(OH)·nH2O
mineral
Sandstone
Sandstone (composed primarily of sand-sized minerals or rock grains)
sedimentary
Limonite
FeO(OH)·nH2O
mineral
Limonite/Goethite (Iron Ore)
Hydrous ferric oxides (FeO(OH)·nH2O)
mineral
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide mixture)
mineral
Iron Ore (Limonite and Hematite)
Goethite/Limonite (FeO(OH)·nH2O) and Hematite (Fe2O3)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Brachiopod Fossil in Matrix
Phylum Brachiopoda
fossil
Banded Sandstone (Beach Pebble)
Quartz Arenite Sandstone
sedimentary
Likely milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Mica schist (likely biotite–muscovite schist)
Mica schist; chiefly quartz and mica minerals (muscovite KAl₂(AlSi₃O₁₀)(OH)₂ and/or biotite)
metamorphic
Red Jasper
Silicon Dioxide with Hematite impurities (SiO2 + Fe2O3)
mineral
Satin Spar (Satin Spar Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral