Basalt

Amethyst (Quartz variety)

Amethyst [Silicon Dioxide (SiO2)]

Greenstone (Epidisite / Chlorite Schist)

Metabasalt (often contains Epidote Ca2Al2(Fe3+,Al)(SiO4)(Si2O7)O(OH) and Chlorite)

Gabbro

Gabbro

Chinese Writing Stone

Porphyritic Basalt (with Andalusite/Feldspar phenocrysts)

Chinese Writing Stone

Porphyritic Basalt (or Andesite) with Feldspar inclusions

Mexican Beach Pebbles

Vesicular Basalt / Andesite (Polished by erosion)

Porphyritic Basalt (likely artificially dyed or altered)

Basalt with plagioclase phenocrysts (likely treated)

Porphyritic Basalt (Chinese Writing Stone)

Porphyritic Basalt with Andalusite or Feldspar laths

Scoria (Lava Rock)

Extrusive Igneous Scoria (Vesicular Basalt)

Amygdaloidal Basalt with Quartz/Calcite Inclusions

Amygdaloidal Basalt (SiO2 / CaCO3 inclusions)

Basalt River Stone

Basalt (Aphanitic Mafic Igneous Rock)

Peridotite

Peridotite (composed largely of Olivine (Mg,Fe)2SiO4 and Pyroxene)

Peridot

Olivine (Mg, Fe)2SiO4

Larimar

Pectolite (NaCa2Si3O8(OH))

Granite (Weathered River Rock)

Granite (Phaneritic Igneous Rock)

Basalt with Quartz/Quartzite Veins

Aphanitic Mafic Volcanic Rock with Siliceous Infillings

Basalt with Iron Oxidation (Lattice/Veined)

Mafic Volcanic Rock (principally Plagioclase and Pyroxene)

Basalt (River Stone)

Aphanitic Mafic Igneous Rock

Jasper / Yellow Chalcedony Pebble

Silicon Dioxide (SiO2)

Eye Agate

Silicon Dioxide (SiO2) with impurities

Greenstone / Epidosite

Epidosite (Metasomatic rock consisting mainly of Epidite Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH) and Quartz)

Labradorite

Labradorite ((Ca,Na)(Al,Si)4O8)

Agate

Silicon Dioxide (SiO2)

Amethyst

Silicon Dioxide with Iron impurities (SiO2)

Blue Moss Agate / Blue Chalcedony

Silicon Dioxide (SiO2)

Gabbro

Gabbro (Mg, Fe)2Si2O6 / CaAl2Si2O8

Feldspar

KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8

Epidosite

Epidosite (Metasomatic rock consisting mainly of Epidote and Quartz)

Quartz Geode / Druzy Quartz

Silicon Dioxide (SiO2)

Greenschist

Greenschist (Actinolite-Chlorite Schist)

Sunstone

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

Carnelian

Carnelian (Silica, SiO2)

Greenstone / Epidosite

Epidosite (primary minerals: Epidote and Quartz)

Yellow Sapphire

Corundum (Al2O3)

Sagenitic Agate (with Goethite/Rutile inclusions)

Silicon Dioxide (SiO2) with hydrous ferric oxide inclusions

Native Copper

Native Copper (Cu)

Carnelian

Carnelian (Silicon Dioxide, SiO2)

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Magnetite Sand (Black Sand)

Magnetite (Fe3O4)

Lake Superior Agate

Cryptocrystalline Quartz (SiO2 with Iron impurities)

Chalcedony (Yellow Agate)

Cryptocrystalline Quartz (SiO2)