Sedimentary (Secondary Classification For A Weathered Mineral Specimen)

Calcite

Calcite (Mineral, Calcium Carbonate - CaCO3)

Cobaltian Calcite (Cobaltoan Calcite)

Cobalt-bearing Calcite (Ca,Co)CO3

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Blue Agate (Dyed)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Pink Quartzite

Quartzite (primarily SiO2)

Gold Nugget

Native Gold (Au)

Sandstone with Quartz Vein

Arenite with SiO2 intrusion

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Yellow Chalcedony (Agate/Jasper mix)

Silicon Dioxide (SiO2)

Quartzite Pebble

Quartzite (SiO2)

Chalcedony (Agate/Quartz pebble)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Calcite

Calcium Carbonate (CaCO3)

Quartzite (River Cobble)

Quartzite (SiO2)

Sandstone (Green/Yellow Siltstone variant)

Arenite or Siltstone (primarily SiO2 with mineral staining)

Granite Cobble

Felsic intrusive igneous rock

Calcite

Calcium Carbonate (CaCO3)

Aragonite Star Cluster

Aragonite (Calcium Carbonate - CaCO3)

Pyrite

Iron Sulfide (FeS2)

Granite Cobble

Phaneritic Felsic Igneous Rock

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with iron oxide Fe2O3 cement)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Limonite/Hematite inclusions

Botryoidal Chalcedony (Desert Rose / Agate)

Silicon Dioxide (SiO₂)

Sandstone with Foliose Lichen

Arenite (Rock matrix) with Xanthoparmelia or Flavoparmelia (Lichen genus)

Banded Agate

Agate (Cryptocrystalline Quartz, SiO2)

Ferruginous Sandstone

Sandstone (arenite) with Limonite/Goethite cement

Granite Glacial Erratic

Granite (Phaneritic Quartz-Feldspar Plutonic Rock)

Quartz

Silicon Dioxide (SiO2)

Sandstone Geode (Unbroken)

Siliciclastic sedimentary rock (primarily Quartz)

Granodiorite (River Pebble)

Granodiorite

Basalt with Quartz Vein

Basalt (SiO2 vein inclusion)

Greywacke (likely)

Greywacke (a type of sandstone)

Chrysocolla on Quartz/Rhyolite matrix

Hydrated copper phyllosilicate mineral: (Cu,Al)2H2Si2O5(OH)4·nH2O

Chert (Jasper/Quartzite variety)

Microcrystalline Silica (SiO2)

Limonite (Iron Ore/Sandstone mixture)

Limonite (FeO(OH)·nH2O) often mixed with Goethite and sedimentary matrix

Sandstone

Sandstone (clastic sedimentary rock), primarily SiO2

Gneiss (with Quartzite and Biotite)

Gneiss containing SiO2 (Quartz), K(Mg,Fe)3AlSi3O10(OH)2 (Biotite), and (K,Na,Ca)AlSi3O8 (Feldspar)

Sandstone (Quartzite-rich Cobble)

Clastic sedimentary rock (primarily SiO2)

Milky Quartz in Conglomerate Matrix

Silicon Dioxide (SiO2) within Clastic Sedimentary Rock

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Basalt (River Cobble)

Basalt (Mafic volcanic rock)

Apache Tear (Obsidian)

Hydrated volcanic glass (SiO2 with inclusions)

Mixed Quartz and River Pebbles (Stone Collection)

Mixed assortment containing mainly Silicon Dioxide (SiO2)