Leopard Skin Jasper
Silicon Dioxide (SiO2) with various inclusions
sedimentary
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Quartz
Silicon Dioxide (SiO2)
mineral
Siltstone Pebble
Siltstone
sedimentary
Chert (often called Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Dyed Blue Agate
Silicon Dioxide (SiO2) with artificial pigment
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz River Pebble with Algae
Silicon Dioxide (SiO2) with organic biofilm
metamorphic or igneous
Silver (Native Element)
Ag (Argentum) - 90% Silver, 10% Copper alloy in specimen
mineral
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chalcedony in Limestone Host Rock
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
Mineral within Sedimentary Rock
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Amethyst
Amethyst (SiO2 with iron impurities)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Quartz / Rock Crystal
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with Iron impurities
mineral
Zebra Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Quartz Geode or Nodular Quartz
Silicon Dioxide (SiO2) in Host Matrix
mineral
Chert / Flint
Chert (SiO2)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon dioxide (SiO2)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Tiger's Eye (Rough)
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Chert Breccia (Yellow Jasper)
Silicon Dioxide (SiO2) - Brecciated Chert
sedimentary
Ferruginous Sandstone
Arenite with Iron-Oxide Cement
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
Mineral
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Amethyst (Tumbled Cabinet Stone)
Silicon Dioxide (SiO2) with iron impurities
mineral
Sandstone Pebble (Quartzite-rich)
Clastic Terrigenous Sedimentary Rock (SiO2 dominant)
sedimentary
Kambaba Jasper
Stromatolite (Fossilized Algae)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Basalt
Basalt
igneous