Moss Agate
Silicon Dioxide (SiO2) with inclusions of hornblende, chlorite, or manganese/iron oxides
mineral
Category
Basalt
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Carnelian (a variety of Chalcedony)
Silicon Dioxide (SiO₂)
Mineral
Sunstone (Feldspar variety)
Oligoclase or Andesine (Na,Ca)(Al,Si)4O8
mineral
Jasper and Basalt (Mixed Breccia or Chert)
Silicon Dioxide (SiO2) with Ferromagnesian silicates
sedimentary and igneous (mixed)
Yellow Agate
Chalcedony (cryptocrystalline Quartz), SiO2
mineral
Banded Agate Geode (with Microcrystalline Quartz)
Silicon Dioxide (SiO2) - variety Chalcedony/Agate
mineral
Sapphire
Corundum (Al2O3)
mineral
Agate Geode
Cryptocrystalline Quartz (SiO2)
mineral
Greenschist
Chlorite-actinolite schist
metamorphic
Greenschist
Greenschist (composed of Chlorite, Actinolite, and Epidote)
metamorphic
Carnelian (a variety of Chalcedony)
SiO2 (Silicon Dioxide) primarily colored by iron oxide (Hematite)
mineral
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
mineral
Amethyst
Amethyst (Silica mineral, SiO2)
mineral
Bauxite
Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))
sedimentary
Banded Agate
Chalcedony (SiO2)
mineral
Agate (translucent slice)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Sunstone
Plagioclase Feldspar (Na, Ca)(Al, Si)4O8 with Hematite or Copper inclusions
mineral
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Moss Agate with Quartz Druzy
Chalcedony with inclusions (SiO2)
mineral
Carnelian
Carnelian (Silicon Dioxide, SiO2)
mineral
Chalcedony (Desert Rose or Botryoidal Chalcedony)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Peridotite (Olivine/Peridot)
Peridotite: (Mg,Fe)2SiO4 (Olivine-rich ultramafic rock)
igneous
Peridotite (with Olivine and Pyroxene)
Ultramafic Magmatic Rock (Primary minerals: (Mg, Fe)2SiO4 and (Ca, Mg, Fe)2Si2O6)
igneous
Amethyst (Geode)
Silicon Dioxide with Iron impurities (SiO2)
mineral
Andesite Porphyry
Andesite (extrusive volcanic rock)
igneous
Andesite
Andesite (Intermediate Extrusive Volcanic Rock)
igneous
Vesicular Basalt (Scoria)
Aphanitic Mafic Igneous Rock (Vesicular Basalt)
igneous
Basalt with Quartz Veins
Vesicular or aphanitic Basalt with SiO2 (Quartz) intrusions
Igneous
Granite (Pegmatitic)
Phaneritic Felsic Igneous Rock
igneous
River Cobble (likely Basalt)
Mafic Igneous Rock (Aphanitic)
Igneous
Zebra Jasper (usually a trade name for Serpentine or Basalt blend)
Antigorite/Chrysotile (Serpentine family) - Mg3Si2O5(OH)4
metamorphic
Basalt with Quartz Veins
Mafic Igneous Rock (primarily Plagioclase and Pyroxene) with SiO2 inclusions
igneous
Amethyst Quartz (Amethyst Geode)
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
Quartz (Silicon Dioxide with iron impurities), SiO2
mineral
Amethyst Lace Agate / Banded Amethyst
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral
Amethyst Geode
Silicon Dioxide (SiO2) with iron impurities
mineral
Peridot
Olivine ((Mg, Fe)2SiO4)
mineral
Scoria (Lava Rock)
Scoria (Vesicular Basaltic Glass/Rock)
igneous
Scoria (Vesicular Basalt)
Scoria (Extrusive Igneous Rock)
igneous
Greenstone (Amygdaloidal Basalt)
Amygdaloidal Basalt (frequently composed of Plagioclase Feldspar, Pyroxene, and Olivine with Chlorite inclusions)
igneous
Basalt with Desert Varnish
Mafic Igneous Rock with Ferromanganese Coating
igneous