Mineral, Specifically A Rock Fragment

Clear Quartz

Silicon Dioxide (SiO2)

Black Onyx

Silicon dioxide (SiO2)

Sandstone (Red Sandstone / River Stone)

Arenite (composed primarily of Quartz, SiO2, with Iron Oxide cementation)

Sandstone (with potentially metamorphic or basaltic bands)

Arenite / Lithic Wacke

Veined Pebble (likely a Quartz-Veined Pebble)

Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)

Conglomerate

Conglomerate (Sedimentary Clastic Rock)

Chert (Chalk-associated Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Sandstone (with biological crust)

Arenite (SiO2 based)

Sandstone (Quartz-rich Pebble)

Arenite (primarily SiO2)

Sandstone (Red/Brown Variety)

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

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Limonite/Goethite staining)

Quartz (specifically Clear Quartz with iron/hematite staining)

Silicon Dioxide (SiO2)

Sandstone (Greywacke/Siltstone variant)

Clastic Sedimentary Rock (Lithic Wacke)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (primarily SiO2)

Stromatolite

Biogenic Sedimentary Rock (composed predominantly of CaCO3)

Pink Granite (Water-worn Cobble)

Phaneritic Felsic Intrusive Igneous Rock

Pink Granite

Phaneritic intrusive felsic igneous rock

Basalt

Basalt (Composition primarily Plagioclase feldspar, Pyroxene, and Olivine)

Sandstone Cobble

Arenite (Secondary classification based on grain size)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2)

Chalcedony (Agate/Jasper mix in host rock)

Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)

Quartz (specifically Citrine or Yellow Quartzite pebble)

Silicon Dioxide (SiO2)

Agate (specifically, a slice of a Blue Lace or Chalcedony Agate nodule)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Green Quartzite (with Fuchsite)

Quartzite with Muscovite variety Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

Dalmatian Stone

Dalmatian Jasper (Aplitic Perthite)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Chert (Yellow Jasper)

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Ventifact

Eolian Ventifact (often composed of basalt, chert, or quartzite)

Banded Agate (specifically Sardonyx)

Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz

Red Jasper

Jasper (SiO2) with Hematite (Fe2O3) inclusions

Conglomerate

Conglomeratic Sandstone

Sandstone

Arenite (primarily SiO2)

Vesicular Basalt (Scoria)

Mafic extrusive igneous rock (primarily Plagioclase Feldspar and Pyroxene)

Black Tourmaline

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Sandstone (Red Arkose)

Sandstone (Arkose variant, primarily SiO2 with KAlSi3O8)

Pink Granite

Phaneritic Felsic Igneous Rock (Rich in K-Feldspar)

Chert (specifically Agate/Jasper variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Oolitic Ironstone

Sedimentary Ooidal Ironstone (Limonite/Hematite mixture)

Banded Agate (specifically Lake Superior Agate)

Silicon dioxide (SiO2) - Cryptocrystalline Chalcedony