Basalt (Vesicular)
Extrusive igneous rock with vesicular texture
igneous
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Granite and Mixed Landscape Gravel
Plutonic Igneous Rock / Weathered Alluvium
igneous
Basalt Pebble
Extrusive igneous rock (Mafic)
igneous
Tumbled Agate
Silicon Dioxide (SiO2)
gemstone
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (primarily SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Porphyritic Igneous Rock / Granite or Rhyolite Porphyry
Porphyritic intrusive/extrusive igneous rock
igneous
Septarian Nodule
Septarian Concretion (Calcite, Aragonite, Limestone, and Barite)
sedimentary
Quartzite
Quartzite (Metamorphosed Sandstone)
metamorphic
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) vein cutting through host rock
mineral
Barite Rose
Barium Sulfate (BaSO4)
mineral
Quartzite
Metamorphic Quartz Arenite
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Green Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Green Jasper
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary
Moonstone
Orthoclase (Potassium Feldspar), (K,Na)AlSi3O8
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Labradorite
(Ca,Na)(Al,Si)4O8 (Plagioclase Feldspar)
mineral
Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin, CaCO3
gemstone
Labradorite
(Ca,Na)(Al,Si)4O8
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Carnelian
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Black Onyx
Chalcedony (SiO2)
gemstone
Eye Agate Ring
Silicon Dioxide (Chalcedony variety Agate), SiO2
gemstone
Blue Agate Ring
Silicon Dioxide (Chalcedony variety Agate), SiO2
gemstone
Sulemani Hakik (Eye Agate)
Chalcedony (SiO2)
gemstone
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Siltstone
Siltstone
sedimentary
Chert
Microcrystalline quartz (SiO2)
sedimentary
Flint
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Mother of Pearl (Nacre) / Shell Fragment
Biogenic Calcium Carbonate (Aragonite and Conchiolin)
fossil
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Chalcedony
Silicon Dioxide (SiO2)
mineral
Microcline Feldspar (Amazonite or White Feldspar)
KAlSi3O8
mineral
White Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral