Basalt

Diabase (also known as Dolerite)

Diabase / Dolerite

Basalt (River Pebble)

Basalt (Aphanitic Mafic Volcanic Rock)

Amygdaloidal Basalt with Secondary Minerals

Basalt containing secondary mineralization (likely Chlorite, Celadonite, or Zeolites)

Basalt (Water-worn pebble)

Basalt (Mafic Extrusive Rock)

Basalt Pebble

Basalt (Aphanitic Mafic Igneous Rock)

Porphyritic Basalt

Porphyritic Basalt (containing Plagioclase or Alkali Feldspar phenocrysts)

Amygdaloidal Basalt

Basalt with secondary mineral infilling

Basalt with Quartz/Calcite Veins

Amygdaloidal Basalt (SiO2 or CaCO3 inclusions)

River Cobble (likely Basalt or Chert)

Siliceous River Rock / Microcrystalline Quartz / Mafic Igneous

Carnelian (Chalcedony)

Silicon Dioxide (SiO2)

Labradorite (Gray Tumbled)

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

Blue Chalcedony

Silicon Dioxide (SiO2)

Basalt (Vesicular)

Basalt (Extrusive Volcanic Rock)

Basalt with Jasper Veining

Basaltic Rock with Cryptocrystalline Quartz (SiO2)

Olivine/Peridot

Magnesium Iron Silicate (Mg,Fe)2SiO4

Peridot in Basalt

Olivine ((Mg, Fe)2SiO4) in Basalt

Basalt (Polished)

Extrusive mafic igneous rock

Basalt (Arrowhead form)

Extrusive mafic igneous rock

Andesite

Andesite (contains Plagioclase feldspar, Pyroxene, Hornblende)

Olivine (Peridot)

Olivine (Mg, Fe)2SiO4

Carnelian

Carnelian (Silicon Dioxide, SiO2)

Basalt with Vesicle/Vug

Basalt (Aphanitic Mafic Igneous Rock)

Blue Lace Agate

Silicon Dioxide (SiO₂), a variety of Chalcedony

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Chalcedony on Matrix

Silicon Dioxide (SiO2)

Basalt with Epidote (Greenstone)

Epidote-bearing Metabasalt

Labradorite

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

Prehnite

Calcium aluminum silicate hydroxide - Ca2Al(AlSi3O10)(OH)2

Labradorite

Labradorite (Plagioclase Feldspar series; (Ca,Na)(Al,Si)4O8)

Labradorite (Feldspar)

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

Sunstone

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

Epidote

Epidote Group (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Epidote (with Quartz and Feldspar)

Epidote (unakalite/unite), Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)

Epidote in Matrix (likely Amphibolite or Gneiss)

Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)) in Metamorphic Matrix

Green Banded Agate

Agate (Variety of Chalcedony/Quartz), SiO2

Carnelian (Red Chalcedony)

SiO2 (Silicon Dioxide with Iron Oxide impurities)

Ruby (set in a gold pendant)

Ruby (Variety of Corundum, Al2O3)

Olivine in Basalt

Peridotite / Forsterite ((Mg,Fe)2SiO4)

Basalt (Vesicular)

Basalt (mostly plagioclase, pyroxene, and olivine)

Basalt Pebble

Basalt (Mafic Extrusive Igneous Rock)

Basalt with Quartz/Feldspar Inclusion

Basalt (containing Silicate minerals such as SiO2 and (Ca,Na)(Al,Si)4O8)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock with secondary mineral fillings)