Amazonite
Microcline (variety Amazonite) - K(AlSi3O8)
mineral
Category
Man Made Object (Ring)
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Yooperlite (Sodalite-rich Syenite)
Sodalite-bearing Syenite
igneous
Jasper
Jasper (Silica/Quartz) - SiO2
mineral
Yellow Chalcedony
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Nephrite Jade
Ca2(Mg, Fe)5Si8O22(OH)2
metamorphic
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Carnelian
Carnelian (Silicon Dioxide, SiO2)
mineral
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Granite (Pegmatitic)
Phaneritic Felsic Igneous Rock
igneous
Sandstone with Liesegang Rings
Arenite with Iron Oxide Concretions
sedimentary
Onyx (Black Onyx)
Silicon Dioxide (SiO2) - Chalcedony variety
Mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Petrified Palm Wood
Palmoxylon
fossil
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Petrified Wood
Silicified wood (primarily SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Sandstone (Calcareous or Quartz-rich)
Arenite
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Sandstone
Sandstone (Silicon Dioxide, SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Petrified Wood
Silicified Wood (primarily Silicon Dioxide, SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2 with Hematite inclusions)
sedimentary
Faceted Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
gemstone
Clear Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Chert (specifically Yellow Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Limonite Concretion
Goethite-Limonite (FeO(OH)·nH2O)
sedimentary
Spondylus Oyster Calcification / Fossilized Oyster
Spondylus (Thorny Oyster) / Calcium Carbonate (CaCO3)
sedimentary
White Jade (Nephrite)
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)
metamorphic
Obsidian
Obsidian (Volcanic Glass)
igneous
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified wood (SiO2)
fossil
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (primarily Quartz-based)
sedimentary
Sandstone (Arkose/Quartzose)
Arenite (SiO2 based clastic rock)
sedimentary