Sedimentary (Man Made)

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Turquoise (possible Dyed Howlite or Magnesite imitation)

CuAl6(PO4)4(OH)8·4H2O (Turquoise)

Jasper

Jasper (Silicon Dioxide, SiO2)

Jasper with Agate and Quartz Inclusions

Silicon Dioxide (SiO2) - Chalcedony / Quartz aggregate

Yellow Jasper (Chert variant)

Silicon Dioxide (SiO2)

Orbicular Jasper (Eye Jasper / Kambaba-like pattern)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Yellow Jasper

Silicon Dioxide (SiO2) with impurities of Iron or Goethite

Conglomerate

Conglomerate (Sedimentary Clastic Rock)

Quartz Druze (on Matrix)

Silicon Dioxide (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Optical Calcite (Iceland Spar)

Calcium Carbonate (CaCO3)

Calcite

Calcium Carbonate (CaCO3)

Pyrite

Iron Disulfide (FeS2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Milky/Smoky variety)

Silicon Dioxide (SiO2)

Celestite (Celestine)

Strontium Sulfate (SrSO4)

Quartz (Milky or White Quartz)

Silicon Dioxide (SiO2)

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Native Copper

Native Copper (Cu)

Jasper

Jasper (Silicon Dioxide, SiO2)

Kyanite (within Quartz)

Kyanite (Al2SiO5) in crystalline Quartz base (SiO2)

Sandstone (with ripple marks)

Arenite (SiO2 primarily)

Fossiliferous Limestone (Chertified Limestone)

Calcium Carbonate (CaCO3) often replaced by Microcrystalline Silica (SiO2)

Dendritic Agate (also known as Dendritic Siltstone or Mudstone)

Silicon Dioxide with Manganese/Iron Oxide inclusions (SiO2 + MnO2)

Green Moss Agate / Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron and Manganese inclusions

Dendritic Agate or Manganese Nodule in Chert/Limestone

Silicon Dioxide (SiO2) with Manganese Oxide (MnO2) inclusions

Tree Agate

Dendritic Agate (Silicon Dioxide, SiO2)

Desert Varnish on Sandstone

Ferromanganese coating on Quartz Arenite

Tree Agate

Silicon Dioxide (SiO2) - Dendritic Agate/Chalcedony

Chert (specifically a fragment with Desert Varnish)

Microcrystalline quartz (SiO2)

Black Jasper (Black Stone / River Pebble)

Silicon Dioxide (SiO₂), Opaque variety of Chalcedony

Moss Agate

Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

Petrified Wood

Silicified Wood (SiO2)

Fossiliferous Limestone

Calcite-rich Sedimentary Rock (CaCO3)

Agate (Moss or Banded Agate variety)

Agate (Silicon Dioxide - SiO2)

White Agate (Chalcedony)

Agate (Silicon Dioxide - SiO2)

Porphyritic Basalt (Chinese Flower Stone / Chrysanthemum Stone basalt variety)

Porphyritic Basalt containing Plagioclase Feldspar phenocrysts

Fossiliferous Limestone

CaCO3 (principally Calcite or Aragonite)