Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Category
Man Made Object (Metalwork)
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Tumbled Agate (Dyed Blue)
Silicon Dioxide (Chalcedony variety)
gemstone
Petrified Wood
Silicified Wood (SiO2)
fossil
Amethyst
Quartz (Silicon Dioxide, SiO2)
mineral
Polychrome Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood / Xylopal (SiO2)
fossil
Unakite
Altered Granite (Epidote, Orthoclase Feldspar, Quartz)
metamorphic
Agate
Silicon dioxide (chalcedony), SiO2
sedimentary
Jadeite
Jadeite (NaAlSi2O6)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2) with iron oxide impurities
sedimentary
Septarian Nodule
Septarian Concretion (Calcite, Aragonite, Limestone)
sedimentary
Jasper
Microcrystalline Quartz (SiO2) with iron oxide impurities
sedimentary
Fossil Coral
Rugose Coral or Tabulate Coral (Phylum Cnidaria)
fossil
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Red Jasper (Tumbled)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Agate
SiO2 (Silicon dioxide, chalcedony variety)
Mineral
Yellow Jasper
Chalcedony (Silicon Dioxide with iron inclusions), SiO2
sedimentary
Banded Calcite (often commercially called Onyx)
Calcite (Calcium Carbonate, CaCO3)
mineral
Red Jasper
Jasper (Silica-rich Microcrystalline Quartz, SiO2 with Iron Oxide)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
sedimentary
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)
metamorphic
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Polished blue banded agate slice
Chalcedony (microcrystalline quartz), SiO₂, commonly with trace iron and other coloring elements
mineral
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Sandstone
Arenite
sedimentary
Obsidian (Black)
Obsidian (High-silica volcanic glass)
igneous
Jade (likely Nephrite or Jadeite)
Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)
Metamorphic rock (for Nephrite and some Jadeite); Mineral (for Jadeite)
Polished greenstone (likely serpentinite)
Serpentinite, chiefly antigorite/lizardite Mg₃Si₂O₅(OH)₄, possibly with magnetite
metamorphic
Amber
Fossilized Tree Resin (C10H16O)
gemstone
Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2 (Tremolite-Actinolite series)
metamorphic
Basalt
Basalt (comprising Plagioclase feldspar, Pyroxene, and Olivine)
igneous
Dark rounded pebble, likely basalt or slag
Probable fine-grained mafic rock; possibly basalt (plagioclase–pyroxene) or industrial iron/steel slag
igneous
Diamond
Carbon (C)
gemstone
Sandstone
Arenite (siliciclastic sedimentary rock composed mostly of quartz)
sedimentary
Basalt
Basalt
igneous