Man Made Rock (Sedimentary Analogue)

Jasper with Epidote Vein

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate (Ca2(Al,Fe)3(SiO4)3(OH))

Green Aventurine (Green Quartzite)

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Turquoise

Turquoise, CuAl6(PO4)4(OH)8·4H2O

Chert

Microcrystalline Quartz (SiO2)

Septarian Nodule (Polished)

Septarian concretion (Calcite, Aragonite, Limestone)

Chert (Siliceous Mudstone variant)

Microcrystalline quartz (SiO2)

Jasper with Quartz Veining

Silicon Dioxide (SiO2) with iron oxide inclusions

Oolitic Chert

Silicon Dioxide (SiO2) with oolitic texture

Chert with Calcite Veins

Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) intrusions

Chert (Limestone/Flint variant)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Chert (often called Flint)

Chert (Microcrystalline Quartz, SiO2)

Sandstone

Arenite (SiO2 primarily)

Jasper

Silicon dioxide (SiO2)

Ocean Jasper

Silicon dioxide with impurities (SiO2 + impurities)

Jasper Breccia

Brecciated Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

Fossiliferous Limestone (Coquina)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Sandstone (Red)

Arenite (SiO2 with Fe2O3)

Granitic Gneiss

Felsic Polycrystalline Gneiss

Gneiss

Gneiss (High-grade Metamorphic Rock)

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Yellow Chert (Cherty Pebble)

Silicon Dioxide (SiO2)

Boulder Opal

Precious Opal in Ironstone (Amorphous Hydrated Silica, SiO2·nH2O)

Turquoise

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

Turquoise

Turquoise - CuAl6(PO4)4(OH)8·4H2O

Petoskey Stone

Hexagonaria percarinata

Sandstone Concretion (Omar or Nut Rock)

Sedimentary Concretion (specifically an 'Omarolluk' or Omar)

Chert (Jasper variation)

Microcrystalline Quartz (SiO2)

Coquina or Fossiliferous Limestone

Biogenic Limestone (Calcite/Aragonite CaCO3)

Fossiliferous Limestone (Crinoidal)

Crinoid Limestone (CaCO3 with fossil biological remains)

River Siltstone Pebble

Siltstone (primarily composed of silica and clay minerals)

Septarian Nodule (Galt)

Calcareous concretion / Septarian concretion

Septarian Nodule (Dragon Stone)

Septarian concretion (composition: CaCO3 - Calcite, Aragonite, and Siderite/Limestone)

Glauconitic Sandstone (Greensand)

Glauconitic Sandstone ((K, Na)(Fe3+, Al, Mg)2(Si, Al)4O10(OH)2)

Chert Pebble with Quartz Veining

Microcrystalline Quartz (SiO2)

Sandstone (with ripple marks)

Arenite / Quartz Sandstone

Banded Chert with Quartz Veining

Microcrystalline Quartz (SiO2)

Quartz Geode

Silicon Dioxide (SiO2) in a Geode body

Rough Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)