Basalt

Carnelian

Carnelian (Chert/Chalcedony variety of Quartz, SiO2)

Lake Superior Agate

Chalcedony (SiO2) with iron inclusions

Sunstone

Oligoclase (Plagioclase Feldspar) with inclusions - (Ca, Na)((Al, Si)4O8)

Greenstone

Metabasalt / Metamorphosed Igneous Rock

Amethyst Geode (Carved)

Amethyst (Violet Crystalline Quartz - SiO2)

Amethyst Geode

Amethyst (Silicon Dioxide, SiO2)

Banded Agate (Lake Superior Agate type)

Agate (Cryptocrystalline Variety of Quartz, SiO2)

Amethyst Geode

Silicon Dioxide (SiO2) - Amethyst variety of Quartz

Scoria (Lava Rock)

Scoria

Amethyst Agate (Polished Point)

Silicon Dioxide (SiO2) with iron impurities

Amethyst Geode (polished heart-cut)

Silicon Dioxide (SiO2) with iron impurities

Greenstone

Metamorphosed Mafic Igneous Rock

Carnelian Agate

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) inclusions

Labradorite (a variety of Feldspar)

Labradorite; (Na,Ca)(Al,Si)4O8 (a plagioclase feldspar)

Diabase (Dolerite)

Diabase or Dolerite

Carnelian Agate

Silicon Dioxide (SiO2) - Variety: Chalcedony

Banded Agate (Tumbled)

Agate (Silicon Dioxide, SiO2 - Cryptocrystalline Quartz)

Black Onyx

Black Chalcedony (SiO2)

Amethyst

Silicon dioxide (SiO2)

Amethyst

Amethyst (SiO2 - Silicon Dioxide with Iron impurities)

Rough Dark Green Sapphire

Corundum (Al2O3)

Pumice (Basaltic/Scoria)

Scoria

Amethyst

Silicon Dioxide (SiO2) with trace Iron (Fe) impurities

Lake Superior Agate

Chalcedony (Silicon Dioxide, SiO2) with Iron impurities

Jasper containing epidote (Unakite-like)

Epidotized Jasper (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH))

Native Copper

Native Copper (Cu)

Quartz Druze on Matrix (Geode Fragment)

Quartz (Silicon Dioxide, SiO2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Amethyst

Amethyst (Silicon Dioxide, SiO2 with Iron impurities)

Amethyst

Silicon Dioxide (SiO2) with Iron impurities

Amethyst

Amethyst (Silicon Dioxide with Iron impurities), SiO2

Copper Nugget

Native Copper (Cu)

Agate (specifically Lake Superior Agate style or Banded Chalcedony)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Agate (specifically Lace Agate or Banded Agate)

Silicon Dioxide (SiO2)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Moss Agate / Carnelian Agate

Silicon Dioxide (SiO2) with iron and manganese inclusions

Greenstone or Epidote-rich Metamorphic Rock

Chlorite/Epidote Schist or Greenstone

Amethyst

SiO2 (Silicon Dioxide)

Red Garnet

Garnet Group (e.g., Pyrope, Almandine, Spessartine, Grossular, Andradite, Uvarovite)

Dragon Blood Jasper

Epidote with Red Jasper inclusions (SiO2 and Ca2(Al,Fe)3(SiO4)3(OH))

Ventifact

Eolian Ventifact (often composed of basalt, chert, or quartzite)

Porphyry

Porphyritic Igneous Rock (likely Porphyritic Andesite or Basalt)