Organic (Paper And Cellulose)

River Pebble (Quartzite/Sandstone mix)

Quartzite (primarily SiO2)

Labradorite

Labradorite (Ca, Na)(Al, Si)4O8

Apache Tears (Obsidian)

Volcanic Glass (SiO2)

Citrine

Silicon Dioxide (SiO2)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Quartzite Pebble

Quartzite (primarily Silicon Dioxide, SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

River Rock (likely Siltstone or fine-grained Sandstone)

Clastic Sedimentary Rock

Quartz

Silicon Dioxide (SiO2)

Limonite

Limonite (Hydrous iron oxides, predominantly Goethite FeO(OH)·nH2O)

Red Siltstone

Siltstone (primarily quartz and feldspar sized 0.0039 to 0.0625 mm)

Quartz / Citrine Quartz

Silicon Dioxide (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Agate

Silicon dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Hag Stone

Porous sedimentary rock (typically Flint, Chert, or Sandstone) with naturally occurring holes

Silver (Native Element)

Silver (Ag) in an alloy of 90% Silver and 10% Copper

Chert (variations include Flint or Jasper)

Chert (SiO2)

Yellow Chalcedony (Agate/Chert)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Granite

Phaneritic plutonic rock (Quartz + Feldspar + Mica)

Banded Agate (Orca Agate)

Silicon Dioxide (SiO2) - Chalcedony variety

Quartz with Iron Staining

Silicon Dioxide (SiO2)

White Jade (Nephrite)

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

Crushed Limestone Aggregate

Limestone (Calcium Carbonate, CaCO3)

Green Fuchsite in Quartz (sometimes called Green Aventurine)

Fuchsite (Chrome-rich Muscovite) K(Al,Cr)2(AlSi3O10)(OH)2 in Quartz SiO2

Blue Lace Agate

Silicon Dioxide (SiO2) - Variety of Chalcedony

Milky Quartz

Silicon Dioxide (SiO2)

Zebra Jasper

Tetragonal Silicon Dioxide (Quartz) with impurities

Rose Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz

Silicon Dioxide (SiO2)

Labradorite (Schiller Spar)

(Na,Ca)(Al,Si)4O8

Chert (Yellow Jasper/River Pebble)

Microcrystalline Quartz (SiO2)

Quartzite

Quartzite (SiO2)

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Amethyst

Quartz (Silicon Dioxide with iron impurities), SiO2

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Chert (Flint) with Glauconite

Microcrystalline Quartz (SiO2)

Chrysocolla in Matrix

Chrysocolla (Cu,Al)2H2Si2O5(OH)4·nH2O

Unable to identify - Image contains non-geological items

Milky Quartz Pebble

Silicon Dioxide (SiO2)