Sedimentary Or Mineral

Zircon

Zircon (Zirconium Silicate - ZrSiO4)

Turquoise (likely Sleeping Beauty variety or treated Howlite imitation)

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

Epidote

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Turquoise

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

Quartz

Crystalline Silicon Dioxide (SiO2)

Pink Opal

Hydrated silica (SiO2 "n H2O)

Quartz

Silicon Dioxide (SiO2)

Turquoise

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

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

White Chalcedony (likely Common Opal or Milky Quartz)

Silicon Dioxide (SiO2)

Howlite

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Quartz

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (with high iron oxide content)

Jasper (var. Ocean or Polychrome Jasper)

Silicon Dioxide (SiO2) with iron and mineral inclusions

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (Lithic arenite / Quartz arenite)

Sandstone

Arenite (primarily SiO2)

Pyrite (on Quartz/Host Rock)

Iron Sulfide (FeS₂)

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Concretion

Various mineral compositions, typically carbonate or iron oxide cemented sediment

Pyrite Geode (Sparkling Druzy)

Iron Sulfide (FeS2) in Sedimentary Nodule

Pyrite in Shale

Iron Disulfide (FeS2) in Sedimentary Shale

Blue Chalcedony

Silicon Dioxide (SiO2)

Marble

Metamorphosed Limestone (CaCO3)

Banded Sandstone

Arenite (Sandstone with iron oxide banding)

Sandstone (likely Arkosic or Lithic)

Clastic Sedimentary Rock (composed predominantly of sand-sized grains, 0.0625 to 2 mm)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Gneiss (Metamorphic Rock)

Gneiss

Sandstone

Arenite (SiO2 principal component)

Limestone with Calcite Veins

Calcium Carbonate (CaCO3)

Quartz with Schist Matrix

Crystalline Silicon Dioxide (SiO2) in micaceous schist

Sandstone (likely Quartzose Sandstone)

Arenite (SiO2 predominantly)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Yellow Quartz / Chalcedony

Silicon Dioxide (SiO2)

Hematite Nodule

Hematite (Fe2O3)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Galena

Lead(II) sulfide (PbS)

Sandstone with Manganese Dendrites/Oxide coatings

Arenite with Pyrolusite and Romanechite (MnO2)