Yellow Quartzite Pebble
Metamorphic rock predominantly composed of Quartz (SiO2)
metamorphic
Category
Mineralogical Specimen
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Banded Calcite (often sold as 'Mexican Onyx')
Calcite (Calcium Carbonate, CaCO3)
Mineral / Sedimentary Rock
Agate (Polished Sphere)
Silicon Dioxide (SiO2)
mineral
Brown Chert
Microcrystalline Quartz (SiO2)
sedimentary
Basalt Pebble
Aphanitic mafic volcanic rock
igneous
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Chert / River Pebble
Cryptocrystalline Quartz (SiO2)
sedimentary
Yellow Quartzite (River Pebble)
Quartzite (primarily SiO2 with iron oxide inclusions)
metamorphic
Quartzite Pebble (River Rock)
Quartzite (mainly SiO2)
metamorphic
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite Cobble
Quartzite (predominantly SiO2)
metamorphic
Quartzite (River Pebble)
Recrystallized Quartz (SiO2)
metamorphic
Chert (with Iron Staining)
Silicon Dioxide (SiO2 / Cryptocrystalline Quartz)
sedimentary
Basalt Pebble
Mafic Igneous Rock (Basalt)
igneous
Quartzite with Iron Inclusions
Metamorphosed Quartz (SiO2)
metamorphic
Sandstone (Ferruginous)
Arenite with Iron-oxide inclusions (SiO2 primarily)
sedimentary
White Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert (Flint variety)
Chert (SiO2)
sedimentary
Sandstone (Greywacke)
Arenite/Greywacke (SiO2 major)
sedimentary
Yellow Chert (Chert / Jasper)
Silicon Dioxide (SiO2 / Microcrystalline Quartz)
sedimentary
Chert (Iron-Stained)
Silicon Dioxide (SiO2)
sedimentary
Tiger's Eye (Banded)
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Milky Quartz/Clear Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Basalt (Drill Core)
Mafic Volcanic Rock (Basalt)
igneous
Quartz (Smoky/Milky variant)
Silicon Dioxide (SiO2)
mineral
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Granitoid (Quartz-Feldspar dominant rock)
igneous
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Granite (Weathered)
Phaneritic Felsic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone Pebble
Arenite (primarily Quartz, SiO2)
sedimentary
Optical Calcite (Iceland Spar)
Calcium Carbonate (CaCO3)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Man-made Dyed Aura Quartz
Silicon Dioxide (SiO2) with metallic coating/dye
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Gray Quartzite Pebble
Quartzite (chemically SiO2)
metamorphic
Sandstone (Quartzite-rich Pebble)
Arenite (primarily SiO2)
sedimentary
Granite Pebble
Granite (Phaneritic intrusive igneous rock comprising Quartz, Feldspar, and Mica)
igneous
Chert (containing Quartz veins)
Chert (SiO2)
sedimentary
Basalt (River Pebble)
Extrusive mafic igneous rock
igneous