Sandstone
Sandstone (composed predominantly of Quartz, SiO2, with Feldspar and Clay minerals)
sedimentary
Category
Man Made Mineral Simulant (Glass)
Browse man made mineral simulant (glass) specimens identified by the Rock Identifier community.
Learn about Man Made Mineral Simulant (Glass) in the encyclopedia
View all →
Marble
Metamorphic Limestone (CaCO3)
metamorphic
Diamond
Diamond (C)
Mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Tree Agate
Chalcedony (SiO2)
gemstone
Breccia
Breccia
sedimentary
Swirled Agate Bead
Silicon Dioxide (SiO2)
mineral
Natural Pearl (appearing in a jewelry setting)
Calcium Carbonate (mostly Aragonite), CaCO3 with Conchiolin
mineral
Rough Diamond
Diamond (pure Carbon, C)
mineral
Amethyst (Tumbled Cabinet Stone)
Silicon Dioxide (SiO2) with iron impurities
mineral
Diamond
Native Carbon (C)
mineral
Chert
Microcrystalline quartz (SiO2)
sedimentary
Fossilized Coral (Petoskey Stone / Hexagonaria)
Hexagonaria percarinata / Rugosa coral (CaCO3)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Granite
Granite (phaneritic intrusive igneous rock consisting of quartz, feldspar, and mica)
igneous
Dyed Blue Agate Slice
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Chert (often called Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Yellow Jasper/Flint)
Chert (Microcrystalline Silicon Dioxide, SiO2)
sedimentary
Diamond in Kimberlite
Diamond in Kimberlite Matrix (Diamond: C, Kimberlite: complex Potassic Peridotite)
igneous
Asphalt Concrete
Bituminous Concrete / Asphaltic Composite
not a natural rock (man-made composite)
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Granodiorite
Granodiorite (Quartz + Plagioclase + Alkali Feldspar + Biotite/Hornblende)
igneous
Iron Slag
Ferrous slag (primarily silicates and oxides of calcium, iron, and magnesium)
Anthropogenic (Man-made industrial byproduct)
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Rutilated Quartz
Quartz with Rutile inclusions (SiO2 with TiO2)
mineral
Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)
Chalcedony (SiO₂)
Mineral (or mineraloid if microcrystalline)
Pearl-and-gemstone insect brooch
Pearl: nacre (aragonite, CaCO₃); colored stones are likely synthetic or natural corundum/spinel/glass, not determinable from the image
gemstone
Chrysocolla
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 inclusions)
sedimentary
Diorite (River Pebble)
Intermediate Phaneritic Igneous Rock
igneous
Granite
Phaneritic Igneous Rock (composed mostly of Quartz, Feldspar, and Mica)
igneous
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Beaded Jewelry (Assorted Gemstones)
Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ
Mineral, Jewelry
Polished blue stone, likely sodalite or dyed agate
Sodalite: Na₈(Al₆Si₆O₂₄)Cl₂; exact identification requires testing
mineral
Amethyst
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Chert (Microcrystalline or cryptocrystalline Quartz - SiO2)
sedimentary
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Chert (and associated river cobbles)
Silicon dioxide (SiO2)
sedimentary
Blue Chalcedony
Chalcedony (Silicon Dioxide, SiO2)
mineral