Sedimentary (Secondary Classification For A Weathered Mineral Specimen)

Turquoise

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

Turquoise

Hydrous phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)

Sandstone (Ferruginous)

Arenite (Fe-bearing Clastic Sedimentary Rock)

Geode (Unopened)

Siliceous Septarian Concretion / Geode (SiO2)

Dalmatian Stone (Dalmatian Jasper)

Peralkaline Quartz-Feldspar Rock with Arfvedsonite

Sandstone

Arenite (primarily SiO2)

Quartz (Drusy/Crystalline)

Silicon Dioxide (SiO2)

Chert (specifically Flint)

Microcrystalline quartz (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Chalcopyrite in Quartz (Gossan/Iron Hat)

CuFeS2 (Chalcopyrite) with SiO2 (Quartz)

Chalcedony (Botryoidal/Tumbled Agate)

Silicon Dioxide (SiO2)

Chalcedony (Smoky Quartz or Agate nodule fragment)

Silicon Dioxide (SiO2)

Agate (Carnelian-like)

Chalcedony (Silicon Dioxide, SiO2)

Banded Calcite (Mexican Onyx)

Calcite (CaCO3)

Chalcedony Geode Fragment

Microcrystalline Quartz (SiO2)

Sandstone (Ferruginous)

Sandstone (Clastic sedimentary rock, predominantly SiO2 with Fe2O3 cement)

Orpiment

Orpiment (As2S3)

Sandstone (Stream-rounded Cobble)

Arenite (composed primarily of SiO2, Silica)

Moqui Marble (Iron-Oxide Concretion)

Iron Oxide Concretion (Fe2O3)

Pyrite

Iron Sulfide (FeS2)

Amygdaloidal Rhyolite

Amygdaloidal felsic extrusive rock

Sandstone (Ferruginous)

Arenite (Fe-rich)

Chalcedony (Agate/Carnelian type)

Silicon Dioxide (SiO2)

Blue Chalcedony

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

Chert (Jasper/Quartzite)

Microcrystalline Silicon Dioxide (SiO2)

Chert Conglomerate (or Breccia)

Sedimentary Clastic Rock (variety: Ferruginous Chert Breccia)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Malachite

Malachite - Cu2CO3(OH)2

Chrysocolla

Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)

Chert (also known as Flint or Common Chalcedony)

Cryptocrystalline Silica (SiO2)

Sandstone

Arenite (primarily SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)

Sandstone (with Iron concretions/staining)

Arenite (composed primarily of Quartz and Feldspar with Iron Oxide cement)

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with Fe2O3/FeO(OH) cement)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz

Quartz (Silicon Dioxide, SiO2)

Barite Rose on Marcasite

Barium Sulfate (BaSO4) on Iron Sulfide (FeS2)

Chert (containing Quartz)

Microcrystalline Silica (SiO2)

Agate (specifically Waterline or Onyx-type Agate)

Silicon Dioxide (SiO2) - variety Chalcedony