Sedimentary (Cryptocrystalline Silica)

Chert (specifically Flint or Jasper variant)

Microcrystalline quartz (SiO2)

Calligraphy Stone

Mariam Jasper (Fossiliferous Limestone composed of Hematite and Shell remains)

Chert (Flint variety)

Chert (SiO2)

Chert (or Flint)

Mocrocrystalline Quartz (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (variously known as Flint or River Pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Shiva Lingam

Cryptocrystalline Quartz (Jasproid/Chalcedony mix)

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, SiO2)

Chert (often called Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Gray/Banded Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (variously known as Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Agate

Chalcedony (cryptocrystalline quartz)

Banded Agate

Cryptocrystalline Quartz (SiO2)

Chert (Black Flint)

Chert (Microcrystalline Quartz, SiO2)

Chert (specifically Gray Chert)

Silicon Dioxide (SiO2)

Chert / Flint (with Crinoid Stem Molds)

Microcrystalline Quartz (SiO2)

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Chert (Flint)

Chert (SiO2)

Turquoise

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

Turquoise (likely Sleeping Beauty variety or treated Howlite imitation)

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

Carnelian

Carnelian (a variety of Chalcedony, SiO2)

Geode (Unopened)

Siliceous Septarian Concretion / Geode (SiO2)

Moss Agate

Chalcedony (Silicon Dioxide) with dendritic inclusions (SiO2)

Banded Agate

Cryptocrystalline Quartz (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Pink Banded Agate (Dyed)

Chalcedony (cryptocrystalline silica), chemical formula SiO2

Banded Agate (specifically Black Sardonyx/Onyx variety)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Calligraphy Stone

Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)

Chert (specifically Flint or Jasper variant)

Microcrystalline quartz (SiO2)

Turritella Agate

Silicified Elimia tenera Fossil (SiO2)

Chert (Flint) with Glauconite

Microcrystalline Quartz (SiO2)

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Kambaba Jasper (Crocodile Jasper)

Stromatolite (Fossilized Algae)

Turquoise

Hydrated copper and aluminum phosphate (CuAl6(PO4)4(OH)8·4H2O)

Red Jasper

Jasper (a variety of Chalcedony, SiO₂ with iron oxide inclusions)

Agate

Silicon dioxide (SiO2) - variety Chalcedony

Black Onyx

Cryptocrystalline Chalcedony (SiO2)

Agate

Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Chert / Flint

Silicon dioxide (SiO2)

Ironstone Concretion (Pot Stone)

Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)

Limonite Concretion (Ironstone)

Limonite / Goethite (FeO(OH)·nH2O)