Carnelian (red chalcedony)
Chalcedony, microcrystalline quartz (SiO₂), iron-oxide colored
gemstone
Category
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Red jasper (likely hematite-rich jasper)
Microcrystalline quartz (SiO₂) with iron oxides, chiefly hematite (Fe₂O₃)
mineral
Brown chalcedony (likely carnelian/iron-stained quartz)
Microcrystalline quartz, SiO₂; brown coloration from iron oxides/hydroxides
mineral
Brecciated agate/chalcedony
Microcrystalline quartz (SiO₂), chiefly chalcedony with possible quartz and iron-oxide inclusions
mineral
Tumbled zebra stone, likely zebra marble or banded calcite
Zebra marble (recrystallized calcite, CaCO₃), possibly black-and-white banded calcite
metamorphic
Polished labradorite cabochon
Labradorite, a calcium-rich plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈
mineral
Green aventurine quartz sphere
Quartz, SiO₂, with fuchsite or other green mica inclusions
mineral
Polished jasper pebble
Jasper, microcrystalline quartz (SiO₂), commonly with iron-oxide impurities
metamorphic
Orange chalcedony (likely carnelian), polished shard
Microcrystalline quartz, SiO₂; chalcedony variety, orange iron-oxide coloration
gemstone
Polished yellow-orange chalcedony (likely carnelian)
Chalcedony, microcrystalline quartz (SiO₂), iron-colored variety commonly called carnelian
gemstone
Petrified Wood
Silicified wood (Quartz, SiO2)
fossil
Jadeite Ring
Jadeite (NaAlSi2O6)
gemstone
Petrified Wood
Silicified Wood (primarily quartz/chalcedony replacing organic wood structure, SiO2)
sedimentary
Larvikite
Monzonite / Anorthosite (Igneous Rock)
igneous
Red Jasper
Silicon Dioxide with iron impurities (Quartz variety, SiO2)
sedimentary
Porphyry
Porphyritic Igneous Rock
igneous
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary
Greenstone / Serpentinite
Serpentine-group / Altered Mafic Rock
metamorphic
Banded Calcite Spheres (Honey Onyx)
Calcite (CaCO3)
sedimentary
Fancy Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
metamorphic
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Red Jasper
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Black Onyx
Silicon dioxide (SiO2) - Chalcedony variety
mineral
Rhodonite
Manganese silicate: (Mn,Fe,Mg,Ca)SiO3
mineral
Rhodonite
Rhodonite (Mn2+SiO3)
mineral
Banded Calcite (Cave Onyx)
Calcium Carbonate (CaCO3)
sedimentary
Black Onyx
Silicon Dioxide (SiO2) with carbon impurities
mineral
Chalcedony
Silicon Dioxide (SiO2)
mineral
Synthetic Blue Aura Quartz
Silicon Dioxide (SiO2) with Metallic Infusion
mineral (synthetic/man-made coating)
Ferrous Slag (Iron Smelting By-product)
Fused Siliceous Slag
Anthropogenic Material (Man-made Rock)
Ferrochrome Slag
Industrial Glassy Slag (Fe-Cr alloy byproduct)
Antropogenic (Man-made industrial byproduct)
Green Slag Glass
Cullet (Amorphous Silicon Dioxide with impurities)
Man-made rock-like material
Asphalt Concrete
Bituminous Concrete / Asphaltic Composite
not a natural rock (man-made composite)
Sea Glass (Kelly Green)
Amorphous Silica (Silicon Dioxide with Iron/Chromium additives)
Anthropogenic specimen (Man-made material)
Blue Goldstone
Aventurine Glass
Man-made mineral simulant (Glass)