Turquoise cabochon ring
Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Category
Man Made Glass (Not A Natural Rock Or Mineral)
Browse man made glass (not a natural rock or mineral) specimens identified by the Rock Identifier community.
Learn about Man Made Glass (Not A Natural Rock Or Mineral) in the encyclopedia
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Dyed turquoise-colored lava stone beads
Vesicular basalt (scoria), commonly sold as dyed lava rock
igneous
Tumbled black stone, likely black obsidian
Obsidian; volcanic glass, typically rhyolitic composition (SiO₂-rich)
igneous
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Diamond (or Diamond Simulant)
Carbon (C) or Cubic Zirconia (ZrO2)
gemstone
Diamond in Kimberlite
Diamond (C in Kimberlite)
igneous
Diamond (as set in a gold ring)
Carbon (C)
mineral
Dark, weathered stone—possibly basalt or slag
Indeterminate; likely fine-grained basalt (plagioclase–pyroxene)
igneous
Jasper Marble
Silicon Dioxide (SiO2) with Impurities
sedimentary
Corundum (Sapphire/Ruby in Matrix)
Corundum (Al2O3)
mineral
Tumbled purple chalcedony or low-grade amethyst bead bracelet
Chalcedony (microcrystalline SiO₂), possibly quartz/amethyst; composition is SiO₂
mineral
Polished black obsidian
Volcanic glass; primarily rhyolitic SiO₂, with minor iron, magnesium, and other trace elements
igneous
Ceramic or Polished Stone Heart (Anthropogenic Material)
Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)
Synthetic/Anthropogenic Mineraloid
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Metallic sulfide mineral fragment, likely galena
Galena (lead sulfide, PbS), tentative identification
mineral
Corundum (Sapphire variant)
Aluminium oxide (Al2O3)
mineral
Strawberry Quartz (or Pink Aventurine)
Quartz with Hematite/Goethite inclusions (SiO2)
mineral
Amethyst (with Pyrite and other minerals)
Silicon Dioxide (SiO2)
mineral
Diamond (as set in a metal alloy ring)
Diamond (Pure Carbon, C)
mineral
Blue Goldstone
Aventurine Glass (Silicon Dioxide infused with Cobalt/Copper)
Synthetic (Man-made Glass)
Green obsidian (likely moldavite)
Natural volcanic glass; if extraterrestrial-impact glass, moldavite (tektite)
gemstone
Likely gold-colored metal ring with a possible gemstone
Uncertain; possibly gold alloy (Au) with a small quartz or glass-like setting
mineral
Grey Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Diamond
Diamond (pure native carbon, C)
mineral
Carved red jasper bead (likely ceramic imitation)
Jasper, microcrystalline quartz (SiO₂); exact material uncertain from the image
mineral
Granite
Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Diamond (in Jewelry Setting)
Carbon (C)
gemstone
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Quartz
Silicon dioxide (SiO₂)
Mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)
Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)
sedimentary
Sandstone
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Diamond
Native Carbon (C)
mineral
Diamond (as featured in jewelry)
Diamond (C - pure carbon)
mineral
Sandstone
Sandstone (SiO2-rich detrital sedimentary rock)
sedimentary
Sandstone
Arenite (SiO2 composition dominant)
sedimentary
Diamond (Cut jewelry specimen)
Diamond (pure Carbon, C)
mineral
Sandstone
Sandstone (Sedimentary rock composed of silicate grains)
sedimentary
Granite
Granite (a phaneritic intrusive igneous rock consisting mainly of quartz, alkali feldspar, and plagioclase)
igneous
Green Slag Glass
Amorphous Silica / Glassy Blast Furnace Slag
Mineraloid (Industrial byproduct)