Terrazzo (with Marble and Granite fragments)
Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates
sedimentary (man-made composite)
Category
Mineral (Man Made Glass, Not Natural)
Browse mineral (man made glass, not natural) specimens identified by the Rock Identifier community.
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Sandstone
Arenite (SiO2 based)
sedimentary
Diamond
Carbon (C)
mineral
Diamond
Carbon (C)
mineral
Banded Calcite or Travertine
Calcium Carbonate (CaCO3)
Sedimentary
Diamond
Native Carbon (C)
gemstone
Sea Glass
Amorphous silicon dioxide (glass)
mineral
Coquina
Biogenic Limestone (Calcite/Aragonite base, CaCO3)
sedimentary
Green cabochon gemstone, likely aventurine or dyed chalcedony
Indeterminate from image; possible quartz variety (SiO₂), including aventurine quartz or chalcedony
gemstone
Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Man-made Synthetic Material (Not a rock or mineral)
Polyester (Polyethylene terephthalate) / Faux Fur
Synthetic / Textile
Amethyst
Silicon Dioxide (SiO2)
mineral
Angel Aura Quartz (Treated Clear Quartz)
Silicon Dioxide (SiO2) coated with Vaporized Silver and Platinum
mineral
Crackled Quartz (Blue Dyed)
Silicon Dioxide (SiO2) with anthropogenic dye
mineral
Polished black stone egg, probably black obsidian
Obsidian, a natural volcanic glass; composition primarily silica-rich glass (approximately SiO₂), with variable iron and other trace elements
gemstone
Pearl
Calcium Carbonate (CaCO3) with Conchiolin
mineral
Man-made Ceramic / Clay Figurine
Aluminosilicate Ceramic (Processed Clay)
Synthetic (not a rock or mineral)
Crushed Stone / Gravel
Aggregatus saxum (variable mineral composition)
sedimentary
Coquina
Bioclastic Limestone (Coquina)
sedimentary
Chalk
Calcium carbonate (CaCO3)
sedimentary
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Turquoise bead bracelet
Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
mineral
Diamond
Native Carbon (C)
mineral
Banded Sandstone
Arenite with Liesegang banding
sedimentary
Diamond (as set in a metal alloy ring)
Diamond (Pure Carbon, C)
mineral
Sandstone
Clastic sedimentary rock (Quartz arenite/Arkose)
sedimentary
Pearl
Aragonite (CaCO3) with Conchiolin
mineral
Diamond
Carbon (C)
gemstone
Coquina
Coquina (Bioclastic Limestone)
sedimentary
Polished white chalcedony or milky quartz pebble
Chalcedony, microcrystalline quartz (SiO₂), possibly with iron-oxide staining or a minor mineral inclusion
mineral
Chalk
Calcite (CaCO3)
sedimentary
Green Aventurine
Silicon Dioxide (SiO2+KAl2(AlSi3O10)(OH)2)
metamorphic
Sandstone
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Slag
Anthropogenic Vitrification Product / Silicate Slag
Anthropogenic (Man-made industrial byproduct)
Yooperlite (Syenite clast containing fluorescent Sodalite)
Sodalite-bearing Syenite
igneous
Carved quartz skull, likely smoky quartz or gray chalcedony
Silicon dioxide (SiO₂), quartz or microcrystalline quartz
gemstone
Chert
Microcrystalline quartz (SiO2)
sedimentary
Granite
Phaneritic Igneous Rock (composed mostly of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Flint / Chert
Microcrystalline Quartz (SiO2)
sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous