Sedimentary (Secondary Classification For A Weathered Mineral Specimen)

Sandstone with Manganese Dendrites/Oxide coatings

Arenite with Pyrolusite and Romanechite (MnO2)

Chrysocolla

Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·n(H2O)

Celestite (Celestine)

Celestine (Strontium Sulfate, SrSO4)

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Ironstone Concretion / Limonite Node

Goethite and Limonite (FeO(OH) nH2O)

Seam Agate

Agate (Banded variety of Chalcedony, SiO2)

Fossilized Shark Tooth (Dermal Denticle or worn tooth fragment)

Elasmobranchii (fossil remains)

Chert (Gravel Bit)

Microcrystalline silica (SiO2)

Chert (Flint variety)

Chert (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Copper Ore with Chrysocolla and Azurite

Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) / Cu3(CO3)2(OH)2 (Azurite)

Sandstone (Yellow/Tan)

Clastic sedimentary rock (primarily SiO2 with iron oxide staining)

Quartz (Milky or Iron-stained)

Quartz (Silicon Dioxide, SiO2)

Jasper with Quartz Veining

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Milky Quartz

Silicon Dioxide (SiO2)

Chert (Ventifact)

Chert (Silicon Dioxide, SiO2)

Gold Nugget

Native Gold (Au)

Chert (Iron-stained)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Chert (and Flint nodule)

Silicon Dioxide (SiO2)

Chert (Quartz Variety)

Chert (mostly SiO2 / Silicon Dioxide)

Chert / Microcrystalline Quartz

Chert (SiO2)

Turquoise

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

Quartz / Quartzite Fragment

Silicon Dioxide (SiO2)

Agate (Turtle Carving)

Agate (Cryptocrystalline variety of Silica, SiO2)

Malachite

Copper(II) carbonate hydroxide [Cu2CO3(OH)2]

Chert (v. Flint)

Sedimentary Cryptocrystalline Quartz (SiO2)

Coral Fossil (Favosites)

Favosites (Extinct genus of tabulate corals)

Chert (River Pebble)

Microcrystalline Quartz (SiO2)

Ferruginous Chert

Microcrystalline Quartz (SiO2) with Iron Oxides

Chert (and/or Flint)

Chert (Cryptocrystalline variety of Quartz, SiO2)

River Cobble (Gneiss/Migmatite)

Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)

Dyed Agate

Chalcedony (SiO2)

Lepidolite in Quartz Matrix

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Agate

Silicon dioxide (SiO2)

Chert (Flint Pebble)

Silicon Dioxide (SiO2)

Chert (Arrowhead/Projectile Point)

Microcrystalline Quartz (SiO2)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Granite

Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)

Malachite

Malachite (Copper Carbonate Hydroxide) - Cu2CO3(OH)2

Quartzite (clastic/metamorphic subtype)

Quartzite (primarily Silicon Dioxide, SiO2)