Basalt

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Amethyst

Silicon Dioxide (SiO2)

Epidote in Matrix (Dragon Stone variant)

Epidote with Quartz/Feldspar (Ca2(Al,Fe)3(SiO4)3(OH))

Sunstone

Plagioclase Feldspar (Na,Ca)(Al,Si)4O8

Heliotrope (Bloodstone)

Cryptocrystalline Quartz (SiO2) with inclusions of Hematite (Fe2O3)

Sunstone

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

Native Copper

Native Copper (Cu)

Blue Chalcedony (Blue Lace Agate variety)

Silicon Dioxide (SiO₂)

Amethyst (as a jewelry accent)

Amethyst (Silicon Dioxide SiO2 with Iron impurities)

Blue Chalcedony

Cryptocrystalline Quartz (SiO2)

Carnelian

Silicon Dioxide (SiO2) - variety of Chalcedony

Scoria (Red Lava Rock)

Scoria

Basalt (River Pebble)

Basalt (dominated by Plagioclase Feldspar and Pyroxene)

Dark-colored Igneous Rock (likely Basalt or Diabase)

Basalt (extrusive igneous) or Diabase (intrusive igneous)

Amygdaloidal Basalt with Epidote

Amygdaloidal Basalt (Mafic volcanic rock)

Gabbro

Gabbro (composed mainly of calcium-rich plagioclase feldspar and pyroxene)

River Pebble (Greywacke or Basaltic)

Massive Greywacke or Basaltic Andesite

Basalt with Quartz/Epidote Vein

Mafic volcanic rock (formula primarily (Mg, Fe)2SiO4 and CaAl2Si2O8)

Porphyritic Andesite (often called Chinese Writing Stone)

Porphyritic Basaltic Andesite with Feldspar Phenocrysts

Basalt with Iron Oxidation

Aphanitic Mafic Igneous Rock (composed primarily of Plagioclase and Pyroxene)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Epidosite

Epidosite (Metasomatic calcium-aluminum silicate rock)

Greenstone (Greenschist facies)

Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)

Blue Lace Agate

Silicon Dioxide (SiO₂), a variety of Chalcedony

Labradorite

(Ca, Na)(Al, Si)4O8 (Calcium Sodium Aluminum Silicate)

Prehnite

Prehnite, Ca2Al(AlSi3O10)(OH)2

Amethyst (Druze)

Silicon Dioxide (SiO2) with iron impurities

Plagioclase Feldspar

Plagioclase (NaAlSi3O8 - CaAl2Si2O8 series)

Labradorite

Labradorite (Plagioclase Feldspar Series: (Ca,Na)(Al,Si)4O8)

Larimar

Blue Pectolite (NaCa2Si3O8(OH))

Banded Agate (Lake Superior or Jasper-Agate)

Silicon dioxide (SiO2)

River Stone (likely Basalt or Chert)

Silicon Dioxide (SiO2) for chert or Mafic Extrusive Rock for basalt

Sunstone

Plagioclase Feldspar (Na,Ca)(Al,Si)4O8

Amethyst

Silicon dioxide (variant with ferric iron impurities), SiO2

Banded Agate (Onyx type)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Amethyst

Quartz (Silicon Dioxide with iron impurities), SiO2

Black River Stone (Chert or Basalt Pebble)

Microcrystalline Quartz (SiO2) or Mafic Igneous Rock

Epidote with Unakite characteristics

{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Banded Agate (specifically Moss or River Agate variety)

Cryptocrystalline Quartz (SiO2)

Labradorite

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

Ruby

Corundum (Aluminum Oxide with Chromium), Al2O3:Cr

Epidote Water-Worn Pebble

Epidote {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)