Metamorphic Rock (Composed Of Multiple Minerals)

Banded Agate Geode

Silicon Dioxide (SiO2)

Granite

Granite (a common igneous rock)

Banded River Cobble with Mafic Dike

Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion

Slate

Slate (Low-grade foliated metamorphic rock)

Anthracite Coal

Anthracite (Carbon-based sedimentary-metamorphic rock)

Serpentine

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4

Tufa (Limestone)

Calcareous Tufa (CaCO3)

Quartzite Pebble

Recrystallized Quartz (SiO2)

Basalt (Weathered Pebble)

Extrusive mafic igneous rock; minerals primarily Plagioclase feldspar and Pyroxene

White Quartz

Quartz (SiO2)

Unakite (Epidote with Quartz and Feldspar)

Unakite (Metasomatized Granitic Rock)

Unakite

Unakite (altered granite)

Montana Moss Agate

Chalcedony (SiO2) with Manganese/Iron oxide inclusions

Liesegang Ring Siltstone

Siltstone with iron oxide Liesegang bands

Serpentine

Antigorite, Lizardite, or Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Granite

Phaneritic Igneous Rock (Granite)

Diorite

Diorite (Intermediate intrusive igneous rock)

Diamond (Uncut Crystal)

Carbon (C)

Dragon Vein Agate

Chalcedony (Quartz) - SiO2

Calcite on Limestone (or Fossil)

Calcium Carbonate (CaCO3)

Diorite (Polished Cobble)

Diorite (Intermediate intrusive igneous rock)

Granitic Pegmatite

Granite Pegmatite (principally KAlSi3O8, SiO2, and KAl2(AlSi3O10)(OH)2)

Quartzite

Quartzite (SiO2)

Unakite

Epidotized Granite

Granodiorite (foreground) and Rose Quartz (background)

Granodiorite / Quartz (SiO2)

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Quartzite (River Pebble)

Metamorphosed sandstone (SiO2)

Turquoise

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

Chert (or Flint)

Chert (Sedimentary Cryptocrystalline Sio2)

Fossiliferous Chert (with Brachiopod or Mollusk fragments)

Silicon dioxide (SiO2) with Calcium Carbonate (CaCO3) inclusions

Quartzite

Metamorphic Quartzite (predominantly SiO2)

Green Quartzite (or Aventurine)

SiO2 (Silicon Dioxide) primarily, with Fuchsite inclusions (K(Al,Cr)2AlSi3O10(OH)2)

Banded Agate (specifically Lake Superior Agate)

Silicon dioxide (SiO2) - Cryptocrystalline Chalcedony

Schist

Mica Schist

Ferruginous Quartz

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Quartzite

Quartzite (mainly SiO2)

Mixed Mineral Specimens

Mixed Silicates, Oxides, and Phosphates (SiO₂, Ca₅(PO₄)₃(F,Cl,OH), Na₈Al₆Si₆O₂₄Cl₂, etc.)

Blue Sapphire

Corundum (Al2O3) with traces of Iron and Titanium

Diorite

Diorite (Intermediate intrusive igneous rock)

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

Quartzite

Quartzite (primarily SiO2)

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn)2-3(Si, Al, Fe)2O5(OH)4