Basalt

Rough Dark Green Sapphire

Corundum (Al2O3)

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

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

Amethyst (SiO2 - Silicon Dioxide with Iron impurities)

Banded Agate (Onyx variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Banded Agate (specifically Lake Superior Agate style)

Agate (Cryptocrystalline Quartz), SiO2

Sunstone

Heliolite (Sodium Calcium Aluminum Silicate with Iron or Copper inclusions)

Carnelian

Carnelian (a variety of Chalcedony, SiO2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Amethyst

Amethyst (a variety of Quartz, SiO2)

Obsidian

Volcanic glass (Mainly SiO2)

Sunstone (variety of Feldspar)

Oligoclase Sunstone, Plagioclase Feldspar (Na,Ca)Al(Si,Al)Si2O8

Epidote

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

Peridot (likely, given the color and bead form)

Olivine, variety Peridot (Mg,Fe)2SiO4

Amethyst

Silicon Dioxide (SiO2) with trace Iron (Fe) 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

Quartz in Matrix (possibly Basalt or Siltstone host)

Silicon Dioxide (SiO2) in Host Rock

Wishing Stone (Gneiss or Basalt with Quartz Vein)

Gneiss or Metabasalt (with a Quartz or Calcite intrusion)

Banded Agate (specifically Carnelian Agate slice)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Porphyritic Basalt (Leopard Rock)

Porphyritic Mafic Volcanic Rock

Quartz Vein in Gneiss or Basalt

Milky Quartz (SiO2) within Metamorphic Host Rock

Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

Amethyst Geode

Silicon Dioxide (SiO2) with trace Iron (Fe3+) impurities

Greenstone / Diabase Porphyry

Porphyritic Diabase (Micro-gabbro)

Labradorite

Labradorite (a variety of Plagioclase Feldspar), Na(AlSi3O8) to Ca(Al2Si2O8)

Moss Agate

Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide

Banded Agate (specifically Lake Superior Agate style)

Silicon Dioxide (SiO2) - Chalcedony variety

Zoisite with Ruby (Anyolite)

Anyolite (Ca2Al3(SiO4)3(OH) + (Hb, Al, Cr)2O3)

Larimar and Fossil Coral

Pectolite (NaCa2Si3O8(OH)) and Hexagonaria/Petoskey Stone

River Rock (Glacial Cobbles)

Fluvial Alluvium (Mixed lithology including Quartzite, Basalt, and Granite)

River Cobble (likely Basalt or Metagraywacke)

Non-specific water-worn lithic fragment