Sedimentary (Alluvial Deposit)

Corundum (Sapphire/Ruby in Matrix)

Aluminium oxide (Al2O3)

Native gold nugget (probable)

Native gold, Au; possibly gold-bearing ironstone or quartz matrix

Chalcedony (Yellow Chert / Agate)

Quartz (Silicon Dioxide - SiO2)

Poppy Jasper

Microcrystalline Quartz (SiO2) with hematite and other inclusions

River Pebbles and Cobbles

Mixed Siliciclastic Sediments (Quartzite, Chert, and Sandstone clasts)

Quartz Pebble

Silicon Dioxide (SiO2)

Conglomerate / Breccia Matrix (Aggregated Rock)

Sedimentary Breccia / Conglomerate

Gold Nugget

Native Gold (Au)

Quartz Pebble

Silicon Dioxide (SiO2)

River Pebble Gravel

Hydrothermally modified Clastic Sediment (mainly Quartzite and Chert)

Quartz River Stone

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Weathered conglomerate

Polymictic clast-supported conglomerate, with a sandy or finer-grained matrix

Quartz Pebble

Silicon Dioxide (SiO2)

Light-colored rounded granitic pebble

Likely granitoid, chiefly quartz, feldspar, and mica

Black Pebble (Basalt / Chert)

SiO2 (if Chert) or Mafic Igneous Rock (if Basalt)

Jasper

Silicon Dioxide (Quartz variety, SiO2)

Quartz Pebble

Silicon dioxide (SiO2)

Black Spinel

Magnesium Aluminum Oxide (MgAl2O4)

Aquamarine

Beryl (Be₃Al₂Si₆O₁₈)

Siltstone

Siltstone (siliciclastic sedimentary rock)

Pink Sapphire

Corundum (Al2O3 with Chromium/Titanium/Iron traces)

Blue Topaz

Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)

Conglomerate

Conglomerate Rock

Conglomerate (rounded-pebble rock)

Lithified polymictic conglomerate; clasts cemented by a finer mineral matrix

Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Jasper

Microcrystalline Quartz (SiO2)

Pink Garnet (likely Almandine or Rhodolite)

Garnet Group (Fe3Al2(SiO4)3 to Mg3Al2(SiO4)3)

Conglomerate

Conglomerate (sedimentary clastic rock)

Quartz (Agate/Chalcedony variety)

Silicon Dioxide (SiO2)

Mixed river stones and gravel

Polymictic alluvial clasts; individual pieces may include quartzite, granite, basalt, sandstone, limestone, and slate

Rough Quartz (Alluvial Pebbles)

Silicon Dioxide (SiO2)

Banded River Cobble with Mafic Dike

Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion

Conglomerate

Conglomerate (Sedimentary rock)

Quartz Pebble

Silicon Dioxide (SiO2)

Jasper

Silicon Dioxide (Microcrystalline Quartz), SiO2

Conglomerate

Clastic sedimentary rock (Puddingstone)

Yellow Quartz / Chalcedony Pebble

SiO2 (Silicon Dioxide)

Quartz (Tumbled/Water-worn)

Silicon Dioxide (SiO2)

Quartz Pebble (Citrine or Iron-Stained)

Silicon Dioxide (SiO2)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)