Sedimentary (Secondary Classification For A Weathered Mineral Specimen)

Sandstone (Glacial Cobble)

Arenite / Sedimentary Rock (primarily SiO2)

Chert (Iron-stained)

Chert (Microcrystalline Quartz, SiO2)

Carnelian

Chalcedony (cryptocrystalline quartz), SiO2 (Silicon Dioxide)

Yellow Jasper

Chalcedony (Silicon Dioxide with Iron inclusions), SiO2

Ferruginous Sandstone (Ironstone Conglomerate fragments)

Ferruginous clastic sedimentary rock (SiO2 cemented by Fe2O3)

Diamond

Diamond (pure carbon, C)

Diorite (River Pebble)

Diorite

Garnet (specifically Almandine)

Almandine - Fe3Al2(SiO4)3

Sandstone (likely Arkose)

Arenite (composed mainly of SiO2 with Feldspar)

Fulgurite

Fulgurite (Lechatelierite-rich fused silica)

Blue Celestite (with Galena)

Strontium sulfate (SrSO4) and Lead sulfide (PbS)

Red Sandstone (Old Red Sandstone Pebble)

Arenite with iron oxide (Fe2O3) cement

Chert (Yellow Chert/Flint)

Silicon Dioxide (SiO2)

Bauxite

Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)

Sandstone (Pebble)

Arenite (composed primarily of SiO2)

Pumice (specifically a water-worn, weathered variety)

Vesicular volcanic glass

Basalt River Rock

Basalt (Aphanitic Mafic Igneous Rock)

Sandstone (Quartzite-rich Cobble)

Clastic sedimentary rock (primarily SiO2)

River Cobble (likely Basalt)

Mafic Igneous Rock (Aphanitic)

Quartz (Raw Chunk)

Silicon Dioxide (SiO2)

Carnelian Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

Chert (Flint Pebbles)

Microcrystalline quartz (SiO2)

Basalt River Pebble

Basalt (Mafic volcanic rock)

Bauxite

Bauxite (principal ore of aluminum, primarily Al(OH)3)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Fe2O3 staining)

Pink Lepidolite

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

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Flint

Chert (a form of cryptocrystalline quartz, chemical formula SiO₂)

Echinoid Fossil (Sea Urchin)

Echinoidea (specifically likely Schizaster or similar genus), calcium carbonate (CaCO3)

Siltstone with Weathering Rind

Siltstone (composed of microscopic quartz and clay minerals)

Basalt Pebble

Extrusive mafic igneous rock

Sandstone Concretion

Moqui Marble (Iron-oxide concretion)

Chert (Honey Chert or Chalcedony Pebble)

Cryptocrystalline Quartz (SiO2)

Sandstone (Ferruginous)

Arenite (SiO2 with Fe2O3 inclusions)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone (River Pebble)

Arenite (primarily SiO2)

Quartz

Quartz (SiO2, Silicon Dioxide)

Agate

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Basalt

Basalt (Mafic volcanic rock)

Red Jasper (Tumbled)

Silicon Dioxide (SiO2) with iron oxide inclusions

Yellow Chalcedony or River Jasper

Silicon Dioxide (SiO2)