Tumbled pale-green mineral specimen, likely aventurine or serpentine
Quartzite with fuchsite (aventurine) or serpentine-group mineral; exact identification requires testing
mineral
Category
Metamorphic Rock (For Both Nephrite And Jadeite)
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Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite (Cube variety)
Iron Sulfide (FeS2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Unakite Epidote-Granite
Unakite (Epidotized Granite)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Smoky variety)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 principal)
sedimentary
Nephrite Jade (Hetian Yu)
Tremolite-Actinolite solid solution Ca2(Mg,Fe)5Si8O22(OH)2
metamorphic
Fossil brachiopod or bivalve shell
Likely a fossilized brachiopod; precise genus cannot be determined from the photograph
fossil
Quartz (Milky/Crystalline variety)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Natural Gemstone Cabochons (Ruby, Moonstone, Emerald, Citrine)
Ruby (Al2O3:Cr), Moonstone (KAlSi3O8), Emerald (Be3Al2(SiO3)6:Cr), Citrine (SiO2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Sandstone (Quartz Arenite)
Sandstone (dominated by SiO2 quartz grains)
sedimentary
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Graphite
Graphite (Carbon, C)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Polished serpentine pendant
Serpentinite, chiefly serpentine-group minerals (lizardite, antigorite, chrysotile), commonly with magnetite and carbonate
metamorphic
Sandstone (likely Quartz Sandstone)
Arenite (SiO2 based)
sedimentary
Green Aventurine
Quartz with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Sandstone
Arenite (primarily Quartz and Feldspar composition)
sedimentary
Greenstone / Greenschist
Greenschist (containing Chlorite, Epidote, Actinolite)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Corundum (Sapphire and Ruby)
Aluminum Oxide (Al2O3)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Soapstone (Steatite) and Quartz mix
Steatite (Mg3Si4O10(OH)2) and Quartz (SiO2)
metamorphic
Black gemstone, likely onyx or black spinel
Possible black chalcedony (SiO₂) or spinel (MgAl₂O₄)
gemstone
Tumbled green aventurine (probable)
Quartz-rich aventurine; SiO₂ with dispersed fuchsite mica or other green inclusions
mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral