Tumbled blue stone, likely blue aventurine or dyed quartzite
Quartz (SiO₂), likely with inclusions or artificial dye; exact identification requires testing
mineral
Category
Mineral Like (Natural Glass)
Browse mineral like (natural glass) specimens identified by the Rock Identifier community.
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Green Aventurine
SiO2 (Silicon Dioxide with inclusions of Fuchsite mica)
mineral
Green Aventurine
Aventurine (Silicon Dioxide with Fuchsite inclusions - SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
White quartz-rich pebble
Quartz (SiO₂), possibly milky quartz or quartzite
mineral
Dyed Agate
SiO2 (Silicon Dioxide)
Mineral
Citrine
Citrine (Silicon Dioxide, SiO2)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Shale (possibly Carbonaceous or Oil Shale)
Argillaceous Sedimentary Rock
sedimentary
Quartz Pebble (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Milky quartz pebble
Quartz (SiO₂), commonly called milky quartz
mineral
Likely polished black stone or obsidian
Obsidian (volcanic glass), chiefly SiO₂
igneous
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Green Quartz (Prasiolite or Aventurine)
Silicon Dioxide (SiO2)
mineral
Sandstone
Sandstone (SiO2 dominated)
sedimentary
Smooth river pebble
Indeterminate lithology; likely fine-grained quartz-rich sandstone, siltstone, or weathered chert
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Sandstone
Quartz Arenite / Clastic Sedimentary Rock
sedimentary
Citrine
SiO2 (Silicon Dioxide)
mineral
Dyed Aura Quartz
Silicon Dioxide (SiO2) with metallic coating
mineral
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Polished carnelian-rich agate (likely polyhedral jasper/chalcedony)
Microcrystalline quartz, SiO₂, with iron-oxide inclusions
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Crushed Stone (Gravel/Aggregates)
Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)
sedimentary and igneous (mixed)
Ruby (Raw/Rough)
Corundum (Al2O3 with Chromium trace)
mineral
Yellow Quartz Pebble (Citrine Quartz / Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Fossilized Chiton (Polyplacophora)
Polyplacophora (fossilized valves)
mineralized fossil
Lapis Lazuli (Simulated)
Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Sand
Siliciclastic sediment / Quartz sand (SiO2)
sedimentary
Blue Quartz
Silicon Dioxide (SiO2)
mineral
Emerald
Beryl (Be3Al2(SiO3)6) colored by Chromium and/or Vanadium
mineral
Yellow Quartz (Citrine Quartzite)
Silicon Dioxide (SiO2)
metamorphic
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Hag Stone
Perforated Flint or Chert
sedimentary
Clear quartz sphere
Quartz (silicon dioxide, SiO₂), likely rock crystal or low-grade milky quartz
mineral
Smoky Quartz (Herkimer-style)
Silicon Dioxide (SiO2)
mineral
Howlite (Dyed Turquoise)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Bornite
Bornite (Cu5FeS4)
mineral
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with trace amounts of Iron (Fe3+)
mineral