Man Made Rock (Sedimentary Analogue)

Clear Quartz Sphere

Quartz (Silicon Dioxide, SiO2)

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Arkosic Sandstone

Arkose

Sandstone

Arenite (primarily Quartz, SiO2)

Gastropod Steinkern (Fossilized Snail Cast)

Phylum Mollusca, Class Gastropoda (Commonly CaCO3 or SiO2 after replacement)

Gneiss

Metamorphic Gneiss

Mica Schist

Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)

Gneiss

High-grade foliated metamorphic rock

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Jade (Nephrite or Jadeite)

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)

Granite Gneiss

Gneiss (High-grade Metamorphic Rock)

Picture Jasper

Impure variety of silica (SiO2)

Quartz / Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Chert (Iron-stained)

Chert (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Sandstone with Quartz Veining

Arenite with hydrothermal quartz (SiO2)

Chert (often called Jasper in this color)

Microcrystalline quartz (SiO2)

Chert (White/Gray variety)

Chert (SiO2)

Fossiliferous Limestone with Brachiopods

Calcium Carbonate (CaCO3) with fossilized Brachiopoda sp. (likely Order Spiriferida or Rhynchonellida)

Ferruginous Chert (Jasper)

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Oolite (Ooid Limestone)

Ooidal Limestone (comprised of CaCO3)

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Fossilized Coral (Petoskey-like or Favosites)

Anthozoa (Fossilized Coral)

Banded Chert

Microcrystalline silicon dioxide (SiO2)

Chalcedony in Matrix

Silicon Dioxide (SiO2)

Agate (specifically, a slice of a Blue Lace or Chalcedony Agate nodule)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Agate (Grey Agate Slice)

Microcrystalline Quartz (SiO2)

Common Opal

Hydrated silica (SiO2 " nH2O)

Agate (specifically Waterline or Onyx-type Agate)

Silicon Dioxide (SiO2) - variety Chalcedony

Banded Agate (River Stone)

Agate (Silicon Dioxide - SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Gneiss (specifically a Granitic Gneiss)

Gneiss (typically composed of Quartz, Feldspar, and Mica/Amphiboles)

Granite Gneiss

Gneiss (High-grade metamorphic rock)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Red Jasper

Silicon Dioxide (SiO2) containing Iron Oxide inclusions

Chert (Jasper/Flint variation)

Chert (SiO2)

Yellow Chert (River Pebble)

Microcrystalline Quartz (SiO2)

Chert (often called Jasper or River Rock)

Chert (SiO2)

Banded Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Jasper with Quartz inclusions

Silicon Dioxide (SiO2) - Microcrystalline Chalcedony