Onyx (Black) and Mother of Pearl Inlay
Silicon Dioxide (SiO2) for Onyx; Aragonite (CaCO3) for Mother of Pearl
mineral
Category
Synthetic (Man Made Glass)
Browse synthetic (man made glass) specimens identified by the Rock Identifier community.
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Chert (varieties include Flint and Jasper)
Silicon Dioxide (SiO2)
sedimentary
Amethyst
SiO2 (Silicon Dioxide with iron impurities)
mineral
Chalk
Calcium carbonate (CaCO3)
sedimentary
Moonstone (specifically Rainbow Moonstone / White Labradorite)
White Labradorite (Feldspar Group: (Na,Ca)(Al,Si)4O8)
mineral
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Riverstone (Sandstone Pebble)
Arenite (SiO2 with various lithic fragments)
sedimentary
Polished blue stone, likely sodalite or dyed agate
Sodalite: Na₈(Al₆Si₆O₂₄)Cl₂; exact identification requires testing
mineral
Granite
Granite (plutonic igneous rock)
igneous
Coquina
Biogenic Limestone (CaCO3)
sedimentary
Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)
Chalcedony (SiO₂)
Mineral (or mineraloid if microcrystalline)
Amethyst
Amethyst (SiO2 - Silicon Dioxide with iron impurities)
Mineral
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Coquina
Biogenic Limestone (Calcite, CaCO3)
sedimentary
Coquina
Biogenic Limestone (Coquina)
sedimentary
Coquina
Bioclastic Limestone
sedimentary
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Basalt
Basalt
igneous
Granite
Phaneritic Igneous Rock (composed mostly of Quartz, Feldspar, and Mica)
igneous
Granite
Granite (a phaneritic intrusive igneous rock)
igneous
Sandstone
Clastic sedimentary rock (Quartz arenite/Arkose)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Amazonite
KAlSi3O8 (Potassium Feldspar, variety of Microcline)
Mineral
Tumbled greenstone, likely nephrite jade
Nephrite jade (interlocking tremolite–actinolite amphibole; Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂)
metamorphic
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Chalk
Calcite (CaCO3)
sedimentary
Chalcedony (Common Opal or Agate variant)
Silicon dioxide (SiO2) with trace hydration
mineral
Peanut Wood
Petrified Wood (Silicified Araucaria with Teredo boreholes)
fossil
Fossilized Shark Tooth (Eroded)
Carcharodon sp. or Otodus sp. fragment (likely)
fossil
Red Sandstone
Arenite (Fe2O3 enriched)
sedimentary
Fossiliferous Limestone (Crinoid stem fossils)
Sedimentary Limestone with Crinoidea ossicles
fossil
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper (Iron-rich Chalcedony)
Jasper (Microcrystalline Silicon Dioxide, SiO2 plus iron oxide impurities)
Sedimentary / Metamorphic
Granodiorite
Granodiorite (Quartz + Plagioclase + Alkali Feldspar + Biotite/Hornblende)
igneous
Chert (Yellow/Tan variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Blue Chalcedony
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Bivalve Fossil (Shell Fragment)
Class Bivalvia (Calcium Carbonate - CaCO3)
sedimentary
Chert Nodule (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Diamond
Diamond (Pure Carbon, C)
mineral