Amethyst (with Pyrite and other minerals)
Silicon Dioxide (SiO2)
mineral
Category
Man Made Material (Jewelry, Metal Alloy)
Browse man made material (jewelry, metal alloy) specimens identified by the Rock Identifier community.
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Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral
Crinoid Fossil Stem Segment
Class Crinoidea (Echinodermata)
sedimentary
Banded Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Diamond
C (Native Carbon)
gemstone
Onyx
Chalcedony (SiO2) with parallel banding
mineral
Petrified Wood
Silicified Wood
fossil
Fossilized Shark Tooth
Carcharocles sp. or Striatolamia sp. (Phosphate/Carbonate mineralized Hydroxyapatite)
sedimentary
Lepidolite
K(Li,Al)3(Si,Al)4O10(F,OH)2
Mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)
mineral
Chert (Yellow Jasper/Flint)
Chert (Microcrystalline Silicon Dioxide, SiO2)
sedimentary
Amethyst
Amethyst (Silicon Dioxide, SiO2 + Fe4+ impurities)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
gemstone
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Tumbled yellow quartz (likely citrine or iron-stained quartz)
Quartz, SiO₂; yellow color from trace iron or irradiation/heat-related coloration
mineral
Amethyst Cluster
Silicon Dioxide with Iron impurities (SiO2)
mineral
Angel Aura Quartz (Treated Clear Quartz)
Silicon Dioxide (SiO2) coated with Vaporized Silver and Platinum
mineral
Botryoidal Pyrite
Iron Sulfide (FeS2)
mineral
Dyed Quartz (imitating Emerald/Green Quartz)
Silicon Dioxide (SiO2) with artificial pigment
mineral
Granodiorite with Quartz Veining
Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins
igneous
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Chalk
CaCO3 (primarily Calcium Carbonate), biogenic sedimentary rock
Sedimentary
Pink Amethyst (or Pink Quartz)
Silicon Dioxide (SiO2) with trace inclusions
gemstone
Tumbled or rough turquoise-like specimen
Turquoise, hydrated copper aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O; identification is uncertain from the image
mineral
Chert (or Flint)
Chert (cryptocrystalline quartz), SiO2
Sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Sunstone
Aventurine Feldspar (Plagioclase Feldspar with inclusions)
mineral
Tiffany Stone
Fluorite-bearing Opalized Breccia
Rock/Mineralized Nodule
Gold in Quartz
Hydrothermal Quartz with Native Gold (SiO2 with Au)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Diamond in Kimberlite
Diamond (C in Kimberlite Matrix)
igneous
Diamond
Natural Diamond (Carbon, C)
gemstone
Green Slag Glass
Amorphous Silica / Glassy Blast Furnace Slag
Mineraloid (Industrial byproduct)
Polished green-and-white stone, likely serpentine or nephrite jade
Serpentine-group minerals, commonly antigorite/lizardite; possible nephrite (interlocking actinolite–tremolite)
metamorphic
Rough amethyst-bearing quartz specimens
Quartz, SiO₂; purple coloration from trace iron and irradiation
mineral
Vesicular volcanic rock, likely scoria
Scoria; composition commonly basaltic to andesitic, rich in plagioclase and pyroxene
igneous
Diamond
C (Native Carbon)
mineral
Cubic Zirconia (Simulated Diamond)
Zirconium Dioxide (ZrO2)
mineral (synthetic)