Green aventurine bead bracelet
Quartz (SiO₂), typically green aventurine containing fuchsite mica or other chromium-bearing inclusions
mineral
Category
Non Geological
Browse non geological specimens identified by the Rock Identifier community.
Learn about Non Geological in the encyclopedia
View all →
Iron-stained quartz/chert pebble
Microcrystalline quartz (SiO₂) with iron-oxide minerals, chiefly goethite/limonite
sedimentary
Blue Goldstone
Aventurine Glass (Silicon Dioxide infused with Cobalt/Copper)
Synthetic (Man-made Glass)
Amber
Resinite / Fossilized Tree Resin
mineral
Weathered limestone with possible fossil or calcite coating
Limestone; primarily calcium carbonate (CaCO₃), chiefly calcite
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Snowflake Obsidian
Volcanic glass containing Cristobalite (SiO2)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Slag Glass (Cullet)
Amorphous Silicon Dioxide (SiO2) with metal oxide colorants
Anthropogenic (Man-made)
Metaconglomerate
Protolith: Conglomerate (comprising SiO2, Al2O3, etc.)
metamorphic
Obsidian
Obsidian (Volcanic Glass)
igneous
Opalite
Man-made Opalized Glass (Synthetic Glass)
gemstone
Obsidian
Amorphous volcanic glass (primarily SiO2)
igneous
Decorative gemstone bracelet or jewelry
Unidentifiable from the blurred image; likely colored glass or synthetic stones, possibly mixed gemstone beads
gemstone
Quartzite
Metamorphic Quartzite
metamorphic
Slag Glass
Amorphous Silica Glass (with metal oxide inclusions)
Mineraloid / Industrial Waste
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Metal Chain (Likely Steel or a Steel Alloy)
Steel (primarily iron and carbon); specific alloy unknown
Man-made Object (Metal/Alloy)
Rounded sandstone pebble
Clastic sandstone, predominantly quartz (SiO₂) grains in a cementing matrix
sedimentary
Polished orbicular granite
Orbicular granite, commonly quartz–feldspar–biotite granite with orbicules
igneous
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Obsidian
Volcanic Glass (Amorphous silicon dioxide with trace impurities)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Snowflake Obsidian
Vitreous Volcanic Rock (Amorphous Silicate), SiO2
igneous
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Fulgarite
Fulgurite (Lechatelierite / Vitrified Sand)
igneous
Green cabochon gemstone, likely nephrite jade
Nephrite jade—interlocking amphibole fibers, chiefly tremolite-actinolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂
gemstone
Greenschist (likely chlorite schist)
Greenschist-facies metamorphic rock; commonly quartz + chlorite ± actinolite, epidote, albite, and mica
metamorphic
Likely blue glass or synthetic gemstone jewelry
Uncertain; possibly synthetic spinel, cubic zirconia, or blue glass
gemstone
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Chert (and/or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Blue Slag Glass
Ferro-silicate glass (Slag)
igneous (man-made/industrial)
Limonite Pseudomorph after Pyrite
Limonite (Hydrous iron oxides, FeO(OH)·nH2O) replacing Pyrite (FeS2)
mineral
Raw turquoise
Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Black Obsidian
Volcanic Glass (felsic)
igneous
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Likely tumbled green aventurine or serpentine
Aventurine quartz (SiO₂ with fuchsite mica) or serpentine-group mineral
mineral
Small rounded brown stone, likely weathered iron-rich rock
Indeterminate; possibly ferruginous sandstone, ironstone, or weathered basalt
sedimentary