Botryoidal chalcedony with quartz vug
Microcrystalline quartz, SiO₂ (chalcedony), with a drusy quartz-lined cavity
mineral
Category
Mineral (Man Made Glass)
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Red cabochon gemstone ring (likely ruby or red spinel; identity unconfirmed)
Possibly corundum (ruby, Al₂O₃) or spinel (MgAl₂O₄); visual identification alone cannot distinguish these from glass or synthetic stones.
gemstone
Sandstone
Sandstone (Quartz-rich Arenite / SiO2)
sedimentary
Sandstone (specifically Arkose or Quartz Arenite)
Arenite (primarily SiO2 with possible Feldspar)
sedimentary
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Ruby in Matrix
Corundum (Al2O3)
mineral
Chert or Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Goldstone and Aura Quartz
Cuprous Glass (Goldstone) and Titanium-coated SiO2 (Aura Quartz)
Mineral/Glass Specimen
Flint
SiO2 (Cryptocrystalline Quartz)
sedimentary
Green Glass Cullet / Recycled Glass
Amorphous Silicon Dioxide (SiO2) with various metal oxides
Man-made Glass (Not a natural rock or mineral)
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Tumbled amber-colored chalcedony or jasper
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper
mineral
Chert (Flint / Quartz Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Weathered chert or chalcedony nodule
Microcrystalline quartz (SiO₂), possibly silicified limestone or agate-like chalcedony
sedimentary
Faceted transparent gemstone pendant
Uncertain from image; likely faceted quartz (SiO₂), cubic zirconia (ZrO₂), or glass imitation
gemstone
Lapis lazuli and green-blue chalcedony jewelry
Lapis lazuli: lazurite-bearing metamorphic rock, chiefly lazurite (Na₃Ca(Al₃Si₃O₁₂)S) with calcite and pyrite; second stone: likely chrysoprase or green-blue chalcedony (microcrystalline quartz, SiO₂)
gemstone
Chert (varietal: Flint/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Ferrosilicon Slag (Industrial Vitrified Glass)
Vitreous Silicate Residue
Antropogenic (Man-made industrial byproduct)
Tumbled iron-rich stone, likely hematite-bearing jasper
Jasper (microcrystalline quartz, SiO₂) with iron oxides, chiefly hematite/goethite
mineral
Malaysian 50 Sen Coin
Coinage (specific alloy unknown without metallurgical analysis, but typically brass or bronze for this denomination and era)
Man-made object (coin)
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (specifically Jasper or Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Fossil Shark Tooth
Lamniform (Mackerel Shark) fossil tooth, likely Otodus or Cretalamna
fossil
Tumbled greenstone (likely serpentinite or green jasper)
Serpentinite, commonly dominated by serpentine-group minerals (Mg₃Si₂O₅(OH)₄); exact identification requires testing
metamorphic
Amber
Succinite (Carbon-based organic compound; approximate formula C10H16O)
Mineraloid
Gypsum (Satin Spar / Alabaster variety)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Goldstone
Avventurina (Cu + SiO2 glass)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Likely smoky quartz pendant
Smoky quartz, silicon dioxide (SiO₂), quartz variety colored by irradiation-related defects
gemstone
Sandstone
Arenite (SiO2, often with CaCO3 or Fe2O3 cement)
sedimentary
Jasper
Silicon Dioxide (SiO2)
sedimentary
Pyrite in Matrix
Iron Sulfide (FeS2)
mineral
Sandstone (Red/Brown Variety)
Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)
sedimentary
Diamond
Carbon (C)
mineral
Quartz
Silicon dioxide (SiO₂)
Mineral
Sea Glass (Frosted Glass)
Amorphous Silica (SiO2) with various additives
Man-made material (Anthropogenic 'mineraloid')
Tumbled milky quartz pebble
Quartz (SiO₂), likely milky quartz
mineral
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite
metamorphic