Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Category
Not A Rock Or Mineral
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Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz (Grain)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz Pebble (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Quartz (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Carnelian (Red Chalcedony)
SiO2 (Silicon Dioxide) with Iron Oxide impurities
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic silicate with secondary mineral inclusions)
Igneous
Sandstone Pebble
Sandstone (Quartzose/Feldspathic Sandstone)
sedimentary
Jasper
Chalcedony (Microcrystalline Quartz) - SiO2
sedimentary or metamorphic
Quartz pebble or seed/crumb
SiO2 (if quartz)
mineral
Chalcedony
Silicon dioxide (SiO2)
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Agate
Silicon Dioxide (SiO2)
mineral
Crazy Lace Agate
Agate (Chalcedony - SiO2)
Mineral
Vesicular Basalt (or Porphyritic Scoria)
Vesicular Basalt
igneous
Porphyritic Igneous Pebble / Porphyry
Porphyritic Igneous Rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Tumbled red jasper
Jasper, microcrystalline quartz (SiO₂), commonly colored by iron oxides
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Banded Agate
Cryptocrystalline Quartz (SiO2) with iron oxide inclusions
mineral
Lake Superior Agate
Silicon Dioxide (SiO2)
mineral
Sandstone (Pebble)
Sandstone (SiO2 dominated clastic sedimentary rock)
sedimentary
Agate in Rhyolite
Silicon Dioxide (Quartz/Chalcedony) in Volcanic Rock matrix
igneous
Quartz Veined Siltstone
Siltstone with Quartz Intrusion (SiO2)
sedimentary
Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Charoite
Charoite (Complex silicate mineral rock)
metamorphic
Goldstone
Not a natural mineral or rock. It is an ornamental glass.
Manufactured Glass (Simulant)
Smoky Quartz with Feldspar
SiO2 (Quartz) with KAlSi3O8 (Feldspar)
mineral
Granite
Felsic intrusive igneous rock
igneous
Granite Gravel (Pebble)
Intrusive Felsic Igneous Rock
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Sandstone Concretion
Sedimentary Clastic Rock (Silicate-rich)
sedimentary
Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Granite
Intrusive igneous rock
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
River Rock
Polished Siliceous Rock / Quartzite Pebble
sedimentary
Iron-stained weathered stone (tentative)
Undetermined; possibly weathered iron-rich basalt or concretion
mineral