Metamorphic Rock (Primarily Composed Of Minerals)

River Cobble (Quartzite with Iron Staining)

Metamorphic Quartzite (SiO2 with Fe2O3 inclusions)

Red Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Unakite

Epidotized Granite

Milky Quartz

Silicon Dioxide (SiO2)

Olivine-bearing Basalt / Scoria

Mafic Igneous Rock (primarily (Mg, Fe)2SiO4)

Granite

Phaneritic Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)

Gneiss (Metamorphic Cobble)

Gneiss

Shiva Lingam

Cryptocrystalline Quartz (Jasproid/Chalcedony mix)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) with host rock (often Schist or Basalt)

Epidote in Matrix (Unakite-related)

Epidosite (Ca2(Al,Fe)3(SiO4)3(OH))

Porphyritic Basalt

Amygdaloidal Porphyritic Basalt

Anthracite Coal

Anthracite (Carbon-based metamorphic rock)

Anthracite Coal

Anthracite (Carbon-rich metamorphic rock)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Chrysocolla

Hydrated copper phyllosilicate, Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)

Quartzite

Quartzite (consisting primarily of SiO2)

River Pebble (Gneiss or Quartzite variant)

Course-grained Metamorphic Rock (likely SiO2 dominant)

Ferruginous Quartz

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Basalt with Secondary Mineralization (Likely Zeolites or Calcite)

Aphanitic mafic volcanic rock with secondary mineral inclusions (e.g., CaAl2Si3O10·3H2O for Scolecite)

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Coquina

Coquina (Bioclastic Limestone)

Calcite in Matrix

Calcium Carbonate (CaCO3) on Sedimentary Host Rock

Orange Quartz

Crystalline Silicon Dioxide (SiO2) with iron oxide inclusions

Goldstone (with Tiger's Eye and Quartz)

Aventurine glass (Synthetic SiO2 with Cu inclusions)

Biotite Schist

Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]

Pink Quartz (Inclusion-rich Quartzite)

SiO2 (Silicon Dioxide) with Iron Oxide / Hematite inclusions

Sandstone with Liesegang Rings

Clastic sedimentary rock (Sandstone with iron oxide rhythmic precipitation)

Muscovite Mica (in Quartz/Feldspar Matrix)

Muscovite - KAl2(AlSi3O10)(OH)2

Petoskey Stone (Fossilized Coral)

Hexagonaria percarinata

Jadeite Jade

NaAlSi2O6 (Sodium Aluminum Silicate)

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Anthracite Coal

Low-grade metamorphic carbonaceous rock

Unakite

Unakite (Metamorphosed granite)

Turquoise

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

Granite

Phaneritic Plutonic Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)

River Stone (River Pebble)

River Stone (Composition: primarily Quartzite, Chalcedony, and silicate minerals)

Pink Granite

Phaneritic intrusive igneous rock (Felsic)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)