Igneous, Metamorphic, Sedimentary

Greenstone (Epidosite or Serpentinite)

Metabasalt / Epidote-Chlorite Schist

Banded gneiss pebble

Gneiss, likely quartz–feldspar–mica gneiss

Weathered quartz-rich pebble (tentative)

Likely quartz/chalcedony, SiO₂, possibly iron-stained

Tumbled quartz (likely rose or milky quartz)

Quartz, silicon dioxide (SiO₂)

Quartz Pebble

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Potassium Feldspar

Orthoclase (KAlSi3O8)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Peach/Orange variety)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Calcite

Calcium Carbonate (CaCO3)

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Epidote-bearing Rock

Epidote / Silicate mineral aggregate

Gneiss (Metamorphic Pebble)

Gneiss (SiO2-rich metamorphic rock)

Sapphire

Corundum (Al2O3)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz with Iron Stains

Quartz (SiO2) with iron oxide/hydroxide staining

Mineral/Semiprecious Gemstone (variety of Quartz)

Jasper, Agate, Quartz Mix (Polished Beads)

SiO₂ (Silicon Dioxide) for Quartz. Jasper and Agate are cryptocrystalline varieties of Quartz.

Green Aventurine and Clear Quartz

Aventurine (variety of Quartz - SiO2) and Quartz (SiO2)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Blue-gray quartz-bearing metamorphic rock (likely gneiss or schist)

Quartz–feldspar–mica rock; exact identification requires testing

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

sedimentary

Agate

Silicon dioxide (Chalcedony), SiO2

sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

sedimentary

Quartz (pebble)

Quartz (SiO₂)

Biotite (Mica)

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

Gneiss (Granitic Gneiss)

Gneiss

Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Epidote

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