Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Category
Mineral (Man Made Glass, Not Natural)
Browse mineral (man made glass, not natural) specimens identified by the Rock Identifier community.
Learn about Mineral (Man Made Glass, Not Natural) in the encyclopedia
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Amethyst
Silicon Dioxide (SiO2) with iron impurities
gemstone
Shale with Iron Oxide Staining
Fissile Mudstone (primarily clay minerals and quartz)
sedimentary
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Uncertain rounded gray stone
Possibly granite, gneiss, or a glacially transported granitoid
igneous
Flint (or Chert)
Silicon dioxide (Microcrystalline Quartz, $SiO_2$)
sedimentary
Sandstone (likely Ferruginous)
Sandstone (SiO2 with iron oxides)
sedimentary
Granite
Granite (Mainly SiO2 and Al2O3)
igneous
Amethyst
Quartz (Silicon Dioxide, SiO2)
mineral
Rose Gold (Copper-Gold Alloy)
Aurum-Cuprum Alloy (Au-Cu)
mineral (native element alloy)
Polished blue chalcedony (likely blue quartz/chalcedony)
Microcrystalline quartz, SiO₂; blue color commonly from inclusions or coloration
gemstone
Opal
Hydrated silica (SiO2 "NH2O)
mineraloid
Ruby and Sapphire Cluster Ring
Corundum (Al2O3)
gemstone
Dragon Vein Agate
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Plutonic Felsic Rock
igneous
Diamond
Diamond (pure Carbon, C)
mineral
Slate
Foliated Metamorphic Slate
metamorphic
Fursuit (Synthetic Fur Specimen)
Canis anthropomorphus syntheticus
Anthropomorphic Textile Construct
Quartzite Pebbles or River Rock
Quartzite / Microcrystalline Quartz (SiO2)
sedimentary
Synthetic Costume Accessory (Non-Geological)
Polyester and Acrylic Fiber (Anthropogenic polymer)
Synthetic / Man-made textile
Porcelain (Kaolin-based)
Alumina silicate ceramic (composed primarily of Kaolinite: Al2Si2O5(OH)4)
metamorphic (man-made/engineered)
Diamond in Kimberlite
Diamond (C in Kimberlite Matrix)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Sandstone
Arenite (SiO2 principal composition)
sedimentary
Weathered quartz-rich rock, possibly sandstone or quartzite
Indeterminate; likely quartz sandstone (SiO₂-rich), possibly weakly metamorphosed quartzite
sedimentary
Agate
Banded Chalcedony (SiO2)
mineral
Smoky Quartz with Rutile Inclusions
Silicon Dioxide (SiO2) with TiO2 needles
mineral
Ferruginous Sandstone (Red Sandstone)
Arenite with Hematite/Limonite cement
sedimentary
Rose quartz cabochon (probable)
Quartz, silicon dioxide (SiO₂); pink color typically caused by trace elements and microscopic inclusions
gemstone
Quartz (Herkimer Diamond variant)
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Gneiss (Banded Gneiss Cobble)
Gneiss
metamorphic
Chert (Jasper/Flint variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Likely citrine or yellow glass imitation in a silver-tone bracelet
Citrine: quartz, SiO₂; exact material cannot be confirmed visually
gemstone
Rose quartz beads
Quartz, silicon dioxide (SiO₂), pink variety
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with impurities of Fe3+)
mineral
Granite (Pegmatitic)
Phaneritic Felsic Igneous Rock
igneous
Blue Quartz with Graphite/Tourmaline Inclusions
Silicon Dioxide (SiO2) with Carbon (C) or Schorl elements
mineral
Banded malachite cabochon
Malachite, Cu₂CO₃(OH)₂; the dark bands may be manganese-oxide or other sulfide-rich matrix, and could also indicate a composite or treated specimen
mineral
Granite
Phaneritic Igneous Rock (Granite)
igneous
Granite
Phaneritic intrusive igneous rock
igneous