Sedimentary (Secondary Classification: Cryptocrystalline Quartz)

Basalt with Quartz/Calcite Veins

Amygdaloidal Basalt (SiO2 or CaCO3 inclusions)

Vesicular Basalt (Amygdaloidal)

Amygdaloidal Basalt

Amygdaloidal Basalt

Amygdaloidal Basalt

Basalt with Quartz Veining

Amygdaloidal Basalt (predominately SiO2 and (Na,Ca)(Si,Al)4O8)

Chrysocolla in Quartz (Gem Silica)

Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) / SiO2 (Quartz)

Quartzite with Iron Inclusions

Quartzite (primarily SiO2 with Fe2O3 impurities)

Dyed Agate

Silicon Dioxide (SiO2) - variety Chalcedony

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock)

Gold Nugget

Native Gold (Au)

Amygdaloidal Rhyolite

Amygdaloidal Rhyolite (Felsic volcanic rock)

Chrysocolla

Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·n(H2O)

Amygdaloidal Basalt

Basalt with secondary mineral infilling

Chert (or Flint)

Silicon dioxide (SiO2)

Basalt-Amugydule (Amygdaloidal Basalt)

Aphanitic Mafic Igneous Rock with Vesicle Infillings

Ocean Jasper

Silicon Dioxide (SiO2)

Chrysoprase

Nickel-bearing Chalcedony (SiO2 with Ni impurities)

Cherry Creek Jasper (also known as Red Creek Jasper or Cherry Creek Agate)

Jasper, microcrystalline quartz (SiO₂)

Amygdaloidal Rhyolite (often called Lake Superior Agate relative)

Rhyolite with Calcite/Quartz amygdules (SiO2 and secondary minerals)

Fossilized Wood (Petrified Wood)

Silicified Wood (primarily quartz/chalcedony replacing organic matter)

Petrified Wood

Silicified Wood (primarily Chalcedony/Quartz, SiO2)

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Gold Nugget / Flake

Native Gold (Au)

Honey Calcite (Orange Onyx)

Calcium Carbonate (CaCO3)

Leopardskin Jasper

Jasper (a variety of microcrystalline Quartz)

Limonite (Iron Stone Concretion)

Limonite (Hydrous Iron Oxide) - FeO(OH)·nH2O

Turquoise (likely stabilized or Howlite/Magnesite imitation)

Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O

Chert (varietal: Jasper or Flint likely, but definitive identification is difficult from image)

SiO₂ (silicon dioxide)

Chalcedony (Smoky Quartz or Agate nodule fragment)

Silicon Dioxide (SiO2)

Agate (or Chalcedony)

SiO2 (Silicon Dioxide) - a cryptocrystalline variety of quartz

Blue Agate (Tumbled and Dyed)

Silicon Dioxide (SiO2) with likely organic dyes

Quartz Pebble

Silicon Dioxide (SiO2)

Chrysocolla on Quartz

Chrysocolla (Cu2−xAlx(H2−xSi2O5)(OH)4·nH2O) often associated with Quartz (SiO2)

Drupa Quartz (Sparkly Drusy Quartz on Matrix)

Crystalline Silicon Dioxide (SiO2) on host rock

Satin Spar (Gypsum)

Hydrous Calcium Sulfate (CaSO4·2H2O)

Banded Agate (variety of Chalcedony)

Agate (SiO2)

Phantom Quartz with Chlorite and Hematite inclusions

Silicon Dioxide (SiO2) with inclusions of Chlorite group minerals and Hematite (Fe2O3)

Gold Ore

Native Gold (Au)

Orange Calcite

Calcium Carbonate (CaCO3)

Carnelian

SiO2 (Silicon Dioxide), a variety of Chalcedony

Green Calcite

Calcium Carbonate (CaCO3)

Agate (Chert/Chalcedony)

Silicon Dioxide (SiO2)

Howlite

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)