Quartz Crystal Fragment
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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Black Jasper with Quartz
Silicon Dioxide (SiO2) with impurities
sedimentary
Unakite
Epidotized Granite
metamorphic
Quartz (Milky or Smoky Quartz)
Silicon Dioxide (SiO2)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Peridot (Olivine)
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
mineral
K2 Jasper
Azurite in Granite
igneous
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) with iron and magnesium inclusions
Mineral (Variety of Quartz/Chalcedony)
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineralological
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Banded Iron Formation (Chert)
Banded Iron Formation (BIF) with Jasper/Chert layers
sedimentary
Olivine (Peridotite)
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
igneous
Turquoise (Blue Howlite imitation)
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Banded Agate
Agate (Cryptocrystalline variety of Silica, SiO2)
mineral
Quartz (Milky or Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Blue Lace Agate (with Amethyst Geode center)
Silicon Dioxide (SiO2) - Cryptocrystalline Chalcedony
mineral
Yellow or Honey Quartz
Silicon Dioxide (SiO2)
mineral
Smoky quartz
Quartz (SiO₂), naturally irradiated brown variety
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of organic matter)
fossil
Jasper
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of organic matter)
sedimentary
White chalcedony or quartz-rich pebble
Microcrystalline quartz (SiO₂), possibly with minor calcite or feldspar
mineral
Hag Stone
Perforated Sedimentary Rock (typically Limestone or Sandstone)
sedimentary
Shark Tooth Fossil
Carcharocles megalodon or similar extinct shark tooth
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Iron sulfide-rich ore, possibly pyrite-bearing gossan
Likely pyrite (FeS₂) with iron oxides/hydroxides and host rock; exact identification requires testing
mineral
Tumbled pink feldspar-rich stone, likely granite or microcline
Feldspar-dominant granitoid; probable potassium feldspar (orthoclase/microcline, KAlSi₃O₈) with quartz and minor iron-stained minerals
igneous
Chalcedony
Silicon Dioxide (SiO2)
mineral
Fossil Shark Tooth
Selachii fossil
fossil
Jade (likely Nephrite Jade based on appearance)
Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)
Mineral
Spiny Oyster Shell
Spondylus (Calcium Carbonate, CaCO3)
mineral
Green Jasper
Silicon Dioxide (SiO2)
sedimentary
Lapis Lazuli
Lapis Lazuli (a rock type, not a single mineral, composed primarily of lazurite, calcite, and pyrite)
Mineral, part of a rock
Geode fragment, likely quartz-lined basalt or chalcedony nodule
Microcrystalline quartz (SiO₂), possibly with iron-oxide staining in a basaltic host
mineral
Dyed Agate
Chalcedony (SiO2)
gemstone
Black Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper Variant likely)
Silicon Dioxide (SiO2)
Sedimentary Rock or Mineral (depending on origin and purity)
Agate (Bead Form)
Agate (Cryptocrystalline Quartz, SiO2)
mineral