Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
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Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Limonite Geode / Ironstone Concretion
Hydrated iron oxide-hydroxide (FeO(OH)·n H2O)
sedimentary
Diamond
Carbon (C)
gemstone
Diamond
Carbon (C)
gemstone
Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin
gemstone
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Red Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Diamond
Carbon (C)
gemstone
Pink Opal
Hydrated amorphous silica (SiO2·nH2O)
gemstone
Blue Obsidian (Cullet Glass)
Silicon Dioxide (Amorphous Glass)
mineral
Agate
SiO2 (Chalcedony / Quartz)
sedimentary
Diamond
Carbon (C)
gemstone
Snowflake Obsidian
Volcanic Glass with Cristobalite Inclusions
igneous
Amethyst
Quartz (SiO2)
mineral
Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Lapis Lazuli
(Na,Ca)8(Al,Si)12O24(S,SO4)(Cl)2
mineral
Limonite
FeO(OH)·n(H2O)
mineral
Red Jasper
Silicon Dioxide (SiO2), microcrystalline quartz with iron oxide inclusions
sedimentary
Chert / Flint
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Chrysocolla
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Blue Agate
Chalcedony (SiO2)
gemstone
Tumbled Red Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Ruby in Zoisite (Anyolite)
Ruby-Zoisite
metamorphic
Pyrite
Iron sulfide (FeS2)
mineral
Diamond
Carbon (C)
gemstone
Fossil Shark Tooth
Chondrichthyes (Class)
fossil
Limestone
Calcium carbonate (CaCO3)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Basalt Pebble
Extrusive Igneous Rock
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Quartzite
Metamorphic Quartz Sandstone
metamorphic
Flint / Chert
Silicon dioxide (SiO2)
sedimentary
River Rock
Polished Siliceous Rock / Quartzite Pebble
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Basalt
Extrusive Igneous Rock
igneous
Leopard Skin Jasper or Ring Jasper
Microcrystalline Quartz (Chalcedony with impurities)
sedimentary