Red Jasper (with Chert/Quartz)
Silicon Dioxide (SiO2)
sedimentary
Category
Sedimentary (Volcanic)
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Jasper (likely Iron-stained)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Jasper
Silicon Dioxide (SiO2)
mineral
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and clay impurities
sedimentary
Quartz Druzy (on Matrix)
Silicon Dioxide (SiO2)
mineral
Pumice
Pumice (Amorphous volcanic glass)
Igneous
Red Jasper
Jasper (Silica/Microcrystalline Quartz with Hematite inclusions), SiO2
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Druzy
Crystalline Silicon Dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood and Mixed Rocks
Silicified Wood (SiO2)
fossil
Druzy Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Jasper with Iron Staining
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Chalcedony or Quartz, SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides (Goethite)
sedimentary
Kambaba Jasper
Rhyolite (Volcanic rock) or Stromatolite (debated)
Igneous/Sedimentary (debated)
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Unidentified Dark Mineral or Rock
Indeterminate (Likely Silicon Dioxide or Carbon-based)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Chert (Jasper/Common Opal transition)
Microcrystalline Quartz (SiO2) with iron oxide inclusions
sedimentary
Dalmatian Stone
Dalmatian Jasper (Aphanitic Igneous Rock with Arfvedsonite inclusions)
igneous
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2) with impurities
sedimentary
Blue Onyx (Dyed Agate)
Cryptocrystalline Quartz (SiO2) with artificial pigment
mineral
Agate
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Jasper and Agate Mix
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Red jasper pebble
Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides
mineral
Chalcedony (Agate/Carnelian)
Silicon Dioxide (SiO2)
mineral
Mixed collection of common river stones
Varied lithologies, visibly including quartz-rich rock, dark mafic rock, sandstone, and purple quartz-bearing material
igneous, sedimentary, metamorphic
Vesicular Basalt with Epidote/Amygdaloidal Basalt
Amygdaloidal Basalt (Mg, Fe)2SiO4 + Ca2(Al, Fe)3(SiO4)3(OH)
igneous
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Orbicular jasper (orbicular chert), likely ocean jasper
Silicified microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and/or clay-rich orbicules
sedimentary
Assorted Tumbled Gemstones
Mixed oxides and silicates (including Quartz, Chalcedony, and Feldspar variants)
mineral
Jasper
Silicon Dioxide (SiO2) with iron and magnesium inclusions
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Mixed Mineral Collection
Multi-mineral Assemblage (Quartz, Jasper, Obsidian, Pyrite, etc.)
mineral