Sedimentary Or Metamorphic (Base Substrate)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Conglomerate

Conglomerate (clastic sedimentary rock)

Basalt cobble

Basalt; predominantly plagioclase, clinopyroxene, and often olivine or iron-titanium oxides

Limestone

Calcium Carbonate (CaCO3)

Gravel/Common Siltstone

Siltstone (fine-grained siliciclastic sedimentary rock)

Banded Limestone

Calcareous sedimentary rock (CaCO3)

Conglomerate

Clastic Sedimentary Rock (Conglomerate)

Muscovite Mica

KAl2(AlSi3O10)(F,OH)2

Biotite Mica in Quartz

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2) in Quartz (SiO2)

Chalcedony with Quartz Crystals

Silicon Dioxide (SiO2)

Quartz (Rose Quartz or Jasper variety)

Silicon Dioxide (SiO2)

Limestone Pebble

Sedimentary Calcium Carbonate (CaCO3)

Schist

Mica Schist (contains muscovite/biotite and quartz)

Sandstone (with potential trace fossils)

Clastic sedimentary rock (primarily SiO2)

Sedimentary Breccia

Breccia (Clastic Sedimentary Rock)

Garnet in Matrix

Almandine Garnet (Fe3Al2(SiO4)3)

Lepidolite

Lepidolite (K(Li,Al)3(Si,Al)4O10(F,OH)2)

Sandstone (lithic wake/graywacke variety)

Arenite/Greywacke (SiO2 with lithic fragments)

Schist

Schist (Crystalline Metamorphic Rock)

Schist

Crystalline Metamorphic Rock (Schistose)

Shale

Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)

Biotite (Black Mica)

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

Tumbled or naturally etched mica-rich mineral specimen, likely muscovite

Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂; possibly phlogopite mica

Muscovite Mica

KAl2(AlSi3O10)(F,OH)2

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(OH)2

Talc (Soapstone variety)

Talc (Hydrated magnesium silicate) - Mg3Si4O10(OH)2

Mica Schist

Mica-rich Schist containing Muscovite and Quartz

Sandstone

Arenite (SiO2 based with mineral cement)

Soapstone / Steatite

Steatite (primarily Talc, Mg3Si4O10(OH)2)

Sparkling Druzy Quartz on Matrix

Silicon Dioxide (SiO2) with iron oxide inclusions

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Drupa or Druzy Quartz on Geode Fragment

Crystalline Silicon Dioxide (SiO2)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Ocean Jasper

Orbicular Jasper (Silicon Dioxide, SiO2)

Biotite Schist

Biotite Schist (containing K(Mg,Fe)3AlSi3O10(OH)2)

Greenstone (Greenschist facies)

Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)

Schist

Mica Schist

Serpentine

Antigorite, Lizardite, or Chrysotile (Mg,Fe)3Si2O5(OH)4

Mica Schist

Mica Schist (primarily Muscovite and Biotite micas)

Mica Schist

Mica Schist (Quartz-Biotite-Muscovite Schist)

Blue Sapphire

Corundum (Al2O3)

Schist

Mica Schist