Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Category
Man Made Rock (Technosol)
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Red Sandstone Pebble
Quartzose Sandstone
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Fossil Assortment and Geological Specimens
Various (including Ammonoidea)
fossil
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Tumbled White Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst Geode
Quartz (Silicon Dioxide, SiO2) with iron impurities
mineral
Silicon Carbide (Carborundum)
Silicon Carbide, SiC
mineral
Gastropod Fossil
Class Gastropoda (fossilized)
fossil
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone Pebble
Arenite (SiO2 dominated with iron oxide)
sedimentary
Crazy Lace Agate (Butterfly Carving)
Silicon Dioxide (Microcrystalline Quartz) - SiO2
sedimentary
Quartzite Pebble with Quartz Vein
Metamorphic Sandstone (Quartzite) with Hydrothermal Quartz
metamorphic
Sandstone Concretion
Carbonate-cemented Sandstone Concretion
sedimentary
Fossilized Bone Fragment
Vertebrate Fossil
fossil
Limonite (Ochreous Sandstone)
Hydrous ferric oxides (FeO(OH)qnH2O)
sedimentary
Brachiopod Fossil in Sedimentary Matrix
Phylum Brachiopoda in Siltstone/Mudstone matrix
fossil
Seashell Fragment
Calcium Carbonate (CaCO3) in the form of Aragonite or Calcite
mineral
Auriferous Quartz (Gold-bearing Quartz)
Silicon Dioxide (SiO2) with trace Gold (Au) and Iron Oxides
mineral
Diamond (in Matrix)
Carbon (C)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Metamorphic Rock
Silicon Dioxide (SiO2) within Metasedimentary host
metamorphic
Jasper
Silicon Dioxide (SiO2)
mineral
Goethite
Goethite (FeO(OH))
mineral
Conglomerate with Quartz Inclusions
Conglomerate (clastic sedimentary rock) with internal Quartz (SiO2)
sedimentary
Limestone (Decorative Gravel)
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Basalt River Cobble
Basalt (Aphanitic extrusive mafic igneous rock)
igneous
Basalt
Mafic extrusive igneous rock
igneous
Basalt (River Stone)
Vesicular Basalt
igneous
Unakite
Epidotized Granite
metamorphic
Granite
Phaneritic Felsic Igneous Rock
igneous
Unakite (Tumbled)
Unakite (altered granite)
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary