Basalt

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))

Obsidian

Volcanic Glass (SiO2)

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

Banded Agate (Onyx variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Ventifact

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

Porphyry

Porphyritic Igneous Rock (likely Porphyritic Andesite or Basalt)

Peridot

Olivine (Mg,Fe)2SiO4

Zoisite with Ruby (Anyolite)

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

Moss Agate

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

Banded Agate (specifically Lake Superior Agate style)

Silicon Dioxide (SiO2) - Chalcedony variety

Porphyritic Basalt (Leopard Rock)

Porphyritic Mafic Volcanic Rock

Larimar and Fossil Coral

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

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

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)

Banded Agate (specifically Carnelian Agate slice)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Olivine (likely Peridot variety)

Olivine Mineral Group (specifically Forsterite-Fayalite solid solution series); Chemical formula: (Mg,Fe)2SiO4

Amethyst

SiO2 (Silicon Dioxide) - Purple variety of Quartz

Native Copper

Native Copper (Cu)

Amethyst

Silicon Dioxide with Iron impurities (SiO2)

Green Apophyllite and Stilbite on Quartz Cluster

Apophyllite-(K) (KCa4(Si8O20)(F,OH)·8H2O), Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O), Quartz (SiO2)

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

River Stone (Basalt or Siltstone)

Mafic Volcanic Rock or Clastic Sedimentary Rock

Quartz Veined Diorite or Basalt

Crystalline Silicon Dioxide (Quartz) in Mafic Igneous Host (Basalt/Diorite)

Stream Pebble (Basalt/Greywacke)

Mafic Igneous Rock (Fine-grained)

Vesicular Basalt (Iron Scoria)

Aphanitic Mafic Igneous Rock with Vesicular Texture

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Amethyst

Silicon dioxide with iron impurities (SiO2)

Sunstone

Oligoclase (a plagioclase feldspar variant), (Na,Ca)(Al,Si)4O8

Obsidian

Volcanic glass (Mainly SiO2)

Granite

Granite (phaneritic felsic intrusive rock)

Peridot (likely, given the color and bead form)

Olivine, variety Peridot (Mg,Fe)2SiO4

Epidote

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

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)