Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Category
Man Made Object (Simulant)
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Agate
Silicon Dioxide (SiO2)
mineral
Rutilated Quartz Sphere
Silicon Dioxide with Titanium Oxide inclusions (SiO2 with TiO2)
mineral
Green Aventurine
Quartz (SiO2) with Fuchsite inclusions
mineral
Amazonite
Microcline (Amazonite variety), KAlSi3O8
mineral
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Amazonite
K(AlSi3O8)
mineral
Tiger's Eye
Pseudomorph of quartz after crocidolite (SiO2)
metamorphic
Nephrite Jade
Nephrite
Mineral/Rock
Banded Calcite (often sold as Caribbean Calcite or Mexican Onyx)
Calcium Carbonate (CaCO3)
mineral
Black Jasper (Etched)
Silicon Dioxide (SiO2) with impurities
mineral
Chrysoprase
Silicon dioxide (SiO2) with nickel impurities
mineral
Jasper
Silicon Dioxide (SiO2)
sedimentary
Amazonite
Amazonite (KAlSi3O8 - Microcline)
mineral
Petoskey Stone
Hexagonaria percarinata
Sedimentary
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Petoskey Stone
Hexagonaria percarinata
fossil
Sandstone (Pebble)
Sandstone (SiO2 with matrix/cement)
sedimentary
Porphyry
Porphyritic Igneous Rock
igneous
Slate
Slate (Foliated Metamorphic Rock)
metamorphic
Aventurine
Aventurine Quartz (SiO2 with inclusions of Fuchsite)
metamorphic
Chert (varieties: Flint or Jasper)
Silicon dioxide (SiO2) / Microcrystalline Quartz
sedimentary
Diamond
Carbon (C)
gemstone
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Diabase (Dolerite)
Diabase
igneous
Banded Chert (River Stone)
Silicon Dioxide (SiO2)
sedimentary
Diamond
Carbon (C)
mineral
Diamond
Carbon (C)
mineral
Sandstone
Arenite (SiO2 based typically)
sedimentary
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
metamorphic
Rough Diamond
Diamond (pure Carbon, C)
mineral
Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
mineral
Chert (Commonly known as Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Common Chert Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Shell in Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Coquina
Coquina (Bioclastic Limestone)
sedimentary
Granite
Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous