Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Category
Sedimentary (Secondary Classification For A Weathered Mineral Specimen)
Browse sedimentary (secondary classification for a weathered mineral specimen) specimens identified by the Rock Identifier community.
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Native Sulfur
Sulfur (S8)
mineral
Chert (often called Jasper in this color variety)
Microcrystalline Quartz (SiO2)
sedimentary
Septarian Nodule (Yellow Calcite in Limestone)
Septarian Concretion (CaCO3 with Aragonite and Calcite)
sedimentary
Chert (Septarian or Banded Nodular Variety)
Microcrystalline Quartz (SiO2)
sedimentary
Basalt with Red Inclusions
Aphanitic Mafic Igneous Rock (likely Basalt)
igneous
Quartz (Milky/Crystalline variety)
Silicon Dioxide (SiO2)
mineral
Carnelian
SiO2 (Silicon Dioxide, variety of Chalcedony)
mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Zircon
Zircon (Zirconium Silicate, ZrSiO4)
mineral
Red Jasper
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
sedimentary
Sand and Gravel (Quartz-rich)
Unconsolidated fluvial/beach sediment (primarily Silica/SiO2)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Ironstone Concretion (Moqui Marble)
Hematite/Goethite Concretion (Fe2O3 / FeO(OH))
sedimentary
Chert / Flint Conglomerate
Silicified Sedimentary Breccia (primarily SiO2)
sedimentary
Pink Granite (Potassium-rich)
Phaneritic Felsic Igneous Rock (K-Feldspar Granite)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Coarse Sand Grain / Lithic Fragment
Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)
sedimentary
Pink Granite (River Pebble)
Phaneritic Felsic Igneous Rock
igneous
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Arid Sandy Loam
Arenosols / Regosols
sedimentary
Quartz (in a rock matrix)
Quartz (SiO2)
mineral
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O
mineral
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides (Goethite/Limonite)
sedimentary
Chert (Chert Nodule)
Silicon Dioxide (SiO₂)
sedimentary
Chert (Flint Pebbles)
Microcrystalline Quartz (SiO2)
sedimentary
River Siltstone / Mudstone Pebble
Siltstone (composed of mixed silicate and carbonate minerals)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Chrysoprase
Silicon dioxide (SiO2) with nickel impurities
mineral
Red Jasper
Opaque microcrystalline Quartz (SiO2 with Fe2O3 inclusions)
sedimentary
Quartz (Float/Abraded)
Quartz (SiO₂)
Mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (with high iron oxide content)
sedimentary
River Stone (Quartzite/Siltstone)
Quartzite (primarily SiO2)
metamorphic
Black Sand (Magnetite Sand)
Magnetite-rich Placers (Fe3O4)
sedimentary
Pyrite in Matrix
Iron Sulfide (FeS2)
mineral
Iron Ore / Ironstone Concretion
Mixture of iron oxide/hydroxide minerals, likely some combination of Hematite (Fe2O3), Goethite (α-FeOOH), and Limonite (a general term for hydrated iron oxides of variable composition) or potentially Bauxite (a mixture of aluminum hydroxides, often with iron oxides, (Al(OH)3) and FeO(OH)). The visual characteristics strongly suggest iron-rich material.
Mineral, specifically an iron ore
Quartz River Pebble
Silicon Dioxide (SiO2)
mineral