Anthropogenic Specimen (Man Made)

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Milky Quartz (Water-Worn Pebble)

Quartz (Silicon Dioxide, SiO2)

Gold Nugget

Native Gold (Au)

Chert (Flint)

Chert (SiO2)

Milky Quartz (Gold-bearing Prospecting Specimen)

Silicon Dioxide (SiO2)

Yellow Chert (Jasper)

Chalcedony (SiO2) with iron oxide inclusions

Basalt River Pebble

Extrusive mafic igneous rock; primarily composed of Plagioclase Feldspar and Pyroxene

Amygdaloidal Basalt

Basalt with secondary mineral infilling (commonly Zeolite, Calcite, or Quartz)

Oyster Shell (Aragonite/Calcite)

Calcium Carbonate (CaCO3)

Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (primarily SiO2)

Vanadinite

Vanadinite (Pb5(VO4)3Cl)

Granitic Gneiss

Gneiss (High-grade regional metamorphic rock)

Sandstone Pebble (Quartzite-rich)

Clastic Terrigenous Sedimentary Rock (SiO2 dominant)

Jasper with Quartz Druzy

Silicon Dioxide (SiO2)

Chert / Flint

Microcrystalline Quartz (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Zoisite with Ruby

Anyolite (Ca2Al3(SiO4)3(OH) with Al2O3:Cr)

Amethyst (Geode)

Silicon Dioxide (SiO2) with iron impurities

Sandstone Chert/Quartzite

Silicon Dioxide (SiO2) - Sedimentary Sandstone / Orthoquartzite

Quartz pebble

Silicon Dioxide (SiO2)

Agate (specifically Botswana or Banded Agate variety)

Chalcedony (Silicon Dioxide, SiO2)

Gold Nugget (Placer Gold)

Native Gold (Au)

Granite (Weathered)

Granitic intrusive rock

Limestone (Weathered)

Calcium Carbonate (CaCO3)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

River Siltstone Pebble

Siltstone (primarily composed of silica and clay minerals)

Quartz Pebble

Silicon Dioxide (SiO2)

River Pebble (Likely Quartzite or Chert)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Optical Calcite

Calcium Carbonate (CaCO3)

Chert Pebble

Microcrystalline Quartz (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Sandstone

Arenite (SiO2 dominant)

Yellow Howlite (Dyed Magnesite/Howlite)

Dyed Ca2B5SiO9(OH)5 (Howlite) or MgCO3 (Magnesite)

Granite

Granite (Phaneritic intrusive igneous rock)

Rose Quartz

Quartz (Silicon Dioxide - SiO2)

Angelite

Anhydrite (Calcium Sulfate, CaSO4)

Quartzite pebble

Quartzite (SiO2)

Quartz (Quartzite or Quartz Pebble)

Silicon Dioxide (SiO2)

Limonite with Opal infusion

FeO(OH)·nH2O (Limonite) / SiO2·nH2O (Opal)

Amazonite

Microcline (variety Amazonite), K(AlSi3O8)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)