Tumbled Carnelian
Carnelian (Var. of Chalcedony, SiO2)
mineral
Category
Man Made Object (Ring)
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Petrified Wood
Silicified wood (Quartz replacement, SiO2)
fossil
Fossilized Coral (Coquina/Limestone)
Cnidaria Anthozoa (Fossilized)
sedimentary
Chert (variations include Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Jade (Nephrite or Jadeite)
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)
Metamorphic Rock / Mineral
Agate
Agate (a variety of Chalcedony, SiO2)
Mineral
Chert (Flint / Quartz Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Flint
SiO2 (Cryptocrystalline Quartz)
sedimentary
Chert (White Chert/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Gypsum (Satin Spar / Alabaster variety)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Granite
Plutonic Igneous Rock (composed typically of SiO2, Al2O3, K2O, Na2O, CaO)
igneous
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Belemnite Fossil
Belemnitida (Order within Cephalopoda)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Lava Rock (Dyed)
Basalt / Volcanic scoria
igneous
Lapis Lazuli
Lapis Lazuli (Rock containing Lazurite, Calcite, and Pyrite)
metamorphic
Red Garnet
Almandine and Pyrope (Silicate minerals: Fe3Al2(SiO4)3 and Mg3Al2(SiO4)3)
mineral
Siltstone Pebble
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Quartz
Silicon Dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2) with impurities
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Agate in Matrix
Silicon Dioxide (SiO2) within host rock
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon Dioxide (SiO2) with impurities, microcrystalline quartz
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Basalt Pebble (Shaped)
Extrusive Igneous Rock
igneous
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Agate Nodule
Chalcedony (SiO2)
sedimentary
Agate Nodule
Silicon dioxide (Chalcedony/Quartz), SiO2
sedimentary
Quartz with Mineral Inclusions
Silicon Dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral