Sedimentary Rock (Specifically A Chemical Sedimentary Rock, Or A Chert If Considered Purely Mineral Aggregate)

Shale

Mudstone/Shale

Biotite Mica

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)

Green Jasper

Silicon Dioxide (SiO2) with impurities

Sandstone (likely Fossiliferous)

Arenite / Sedimentum arenaceum

Moss Agate

Agate (Silicon Dioxide, SiO2) with dendritic inclusions

Red Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

Dendritic Siltstone (or Mudstone)

Siltstone with Manganese Oxide dendrites

Red Sandstone

Arenite

Sandstone (Quartz Sandstone)

Clastic sedimentary rock (primarily SiO2)

Quartz (Common Milky Quartz)

Silicon Dioxide (SiO2)

Tufa

Calcareous Tufa (Calcium Carbonate, CaCO3)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Carnelian (Agate)

SiO2 (Silicon Dioxide with Iron Oxide impurities)

Blue Kyanite

Kyanite (Al2SiO5)

Carnelian

Carnelian (a variety of Chalcedony, SiO2)

Jasper

Silicon Dioxide (SiO2)

Sandstone (with potential Quartzite characteristics)

Clastic sedimentary rock (primarily SiO2)

Lava Stone and Chakra Beads

Basalt (with various mineral/synthetic beads)

Quartzite

Quartzite (primarily Silicon Dioxide, SiO2)

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Gneiss (River Cobble)

Gneiss (Foliated Metamorphic Rock)

Gneiss with Quartz Vein

Gneiss containing Quartz (SiO2) filler

Agate (specifically, multi-colored or pastel-dyed agate)

Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).

Gneiss

Gneiss (high-grade metamorphic rock)

Sandstone (Cross-bedded Drill Core)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone Concretion

Sandstone (Sedimentary rock, mostly SiO2)

Sandstone

Clastic Sedimentary Rock (composed mostly of quartz and/or feldspar)

Red Sandstone

Arenite (with Iron Oxide)

Sandstone

Arenite (SiO2 based with various mineral cements)

Sandstone (likely Arkose or Quartz Sandstone)

Arenite (SiO2 principal component)

Sandstone

Arenite (primarily SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron oxide impurities

Garnet Schist

Almandine-mica schist

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz with Mica inclusions (likely Schist or Gneiss host)

Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)

Gneiss

High-grade Metamorphic Gneiss

Quartzite

Quartzite (primarily SiO2)

Sandstone with Calcite Vein

Clastic sedimentary rock (primarily SiO2) with Calcium Carbonate (CaCO3) infilling

Sandstone (with biological crust)

Arenite (SiO2 based)

Ferruginous Breccia

Breccia with Iron-rich (Hematite/Goethite) Matrix