Sedimentary (Secondary Classification For A Weathered Mineral Specimen)

Native Sulfur

Sulfur (S8)

Quartzite Pebble

Quartzite (primarily SiO2)

Chert (often called Jasper in this color variety)

Microcrystalline Quartz (SiO2)

Carnelian

SiO2 (Silicon Dioxide, variety of Chalcedony)

Chert (Septarian or Banded Nodular Variety)

Microcrystalline Quartz (SiO2)

Quartz (Milky/Crystalline variety)

Silicon Dioxide (SiO2)

Septarian Nodule (Yellow Calcite in Limestone)

Septarian Concretion (CaCO3 with Aragonite and Calcite)

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Quartz

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Sand and Gravel (Quartz-rich)

Unconsolidated fluvial/beach sediment (primarily Silica/SiO2)

Pink Granite (Potassium-rich)

Phaneritic Felsic Igneous Rock (K-Feldspar Granite)

Zircon

Zircon (Zirconium Silicate, ZrSiO4)

Ironstone Concretion (Moqui Marble)

Hematite/Goethite Concretion (Fe2O3 / FeO(OH))

Sandstone

Arenite (composed primarily of SiO2)

Chert / Flint Conglomerate

Silicified Sedimentary Breccia (primarily SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Quartz

Silicon Dioxide (SiO2)

Pink Granite (River Pebble)

Phaneritic Felsic Igneous Rock

Quartz

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides (Goethite/Limonite)

Coarse Sand Grain / Lithic Fragment

Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)

Arid Sandy Loam

Arenosols / Regosols

Quartz (in a rock matrix)

Quartz (SiO2)

Turquoise

Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O

Chert

Chert (Microcrystalline Quartz, SiO2)

Chert (Chert Nodule)

Silicon Dioxide (SiO₂)

Chert (Flint Pebbles)

Microcrystalline Quartz (SiO2)

Chrysoprase

Silicon dioxide (SiO2) with nickel impurities

Quartz

Silicon Dioxide (SiO2)

River Siltstone / Mudstone Pebble

Siltstone (composed of mixed silicate and carbonate minerals)

Red Jasper

Opaque microcrystalline Quartz (SiO2 with Fe2O3 inclusions)

Pyrite in Matrix

Iron Sulfide (FeS2)

Quartz (Float/Abraded)

Quartz (SiO₂)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

River Stone (Quartzite/Siltstone)

Quartzite (primarily SiO2)

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.

Sandstone (Ferruginous)

Arenite (with high iron oxide content)

Basalt (Weathered River Stone)

Basalt (Extrusive Mafic Igneous Rock)

Black Sand (Magnetite Sand)

Magnetite-rich Placers (Fe3O4)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz River Pebble

Silicon Dioxide (SiO2)