Man Made Byproduct (Non Geological)

Sandstone (Quartzose)

Arenite (Formula: SiO2 primary, with various cements)

Nephrite Jade

Ca2(Mg,Fe)5Si8O22(OH)2

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

Chert (specifically a flint nodule component)

Microcrystalline quartz (SiO2)

Quartzite

Quartzite (primarily SiO2)

Basalt

Mafic volcanic rock (Primary minerals: Plagioclase feldspar, Pyroxene)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Jade

Jade can refer to two distinct minerals: Nephrite (a variety of the mineral actinolite, Ca2(Mg,Fe)5Si8O22(OH)2) and Jadeite (Na(Al,Fe3+)Si2O6). Based on the image, showing a relatively uniform green color and possibly slight translucence in bead form, it is very likely one of these, but determining which one from a photo is difficult without specific testing.

Moonstone

Adularia (orthoclase) or Albite (plagioclase), a feldspar mineral (KAlSi3O8 or NaAlSi3O8 respectively, often a mixture)

River Rock (likely Siltstone or fine-grained Sandstone)

Clastic Sedimentary Rock

Sandstone (Banded Sandstone)

Clastic Sedimentary Rock (primarily SiO2 with iron oxide impurities)

Dendritic Agate

Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides

Chert (specifically Flint)

Microcrystalline quartz (SiO2)

Red Sandstone

Arenite (predominantly Quartz with Hematite cementation)

Granodiorite (River Pebble)

Granodiorite

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Sandstone (Wonderstone)

Silicified Sandstone / Orthoquartzite with Liesegang rings

Jasper with Hematite inclusions

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)

Green Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Jasper

Jasper (Silicate mineral, SiO2)

Quartzite

Quartzite (primarily SiO2)

Red Jasper (River Siltstone)

Silicon Dioxide (SiO2) with iron oxide inclusions

Granitic Pegmatite

Coarse-grained Igneous Rock (Granitic composition: KAlSi3O8, SiO2)

Ferruginous Sandstone (Ironstone)

Sedimentary rock with Limonite/Goethite cement

Chert (Flint/Jasper variety)

Microcrystalline Quartz (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Moss Agate

Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxides

Moss Agate

Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite

Chert (Flint)

Microcrystalline Quartz (SiO2)

Sandstone (with Iron Oxide staining)

Arenite (primarily SiO2 with Fe2O3 staining)

Sandstone (Quartzite-rich Cobble)

Clastic sedimentary rock (primarily SiO2)

Quartz (Druzy or Crystalline variety)

Silicon Dioxide (SiO2)

Clear Quartz Crystal (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Carnelian (Red Agate/Chalcedony)

Cryptocrystalline Quartz (SiO2) with Hematite impurities

Ocean Jasper

Orbicular Jasper (Silicon Dioxide, SiO2)

Red Jasper

Silicon dioxide (SiO2) with iron oxide impurities

Pearl

Aragonite / Calcium Carbonate (CaCO3)

Amethyst Agate (Polished Point)

Silicon Dioxide (SiO2) with iron impurities

Tree Agate

Silicon Dioxide (SiO2) with inclusions of manganese and iron oxides

Moss Agate

Silicon Dioxide (SiO2) with mineral inclusions of hornblende or chlorite