Citrine Quartz / Yellow Quartz Pebbles
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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Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Carnelian (Chalcedony)
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Quartz Geode
Crystalline Silica (SiO2)
mineral
Sunstone
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
mineral
Jasper (Cream/Yellow variety)
Jasper (Microcrystalline Quartz, SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony - SiO2)
mineral
Green Aventurine
Aventurine Quartz (SiO2 with inclusions)
mineral
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2)
igneous
Porphyritic Basalt (Chinese Writing Stone or Flower Stone)
Porphyritic Basalt / Porphyry
igneous
Snowflake Obsidian
Obsidian (volcanic glass) with Cristobalite inclusions
igneous
Thunderegg (specifically a Jasper/Agate-filled Geode nodule)
Silicon Dioxide (SiO2) within Rhyolitic Matrix
igneous
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of Iron Oxide)
metamorphic
Chert (Yellow Jasper variant)
Microcrystalline quartz (SiO2)
sedimentary
Tumbled amethyst
Quartz, SiO₂; purple variety colored mainly by trace iron and irradiation
mineral
Tumbled blue chalcedony or pale aquamarine-like quartz
Chalcedony (microcrystalline SiO₂), possibly blue quartz; visual identification is uncertain
mineral
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Polished blue chalcedony or glass-like quartz specimen
Chalcedony (microcrystalline SiO₂), possibly treated or synthetic; exact identification requires testing
gemstone
Chert (specifically Flint or Dark Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2 - Silicon Dioxide/Quartz)
metamorphic
Diamond
Carbon (C)
mineral
Chalcedony (Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Diamond
C
gemstone
Chert (often referred to as Flint or Jasper when pigmented)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Diamond
C
gemstone
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2
Mineral
Flint or chert
Microcrystalline quartz (SiO₂), commonly with chalcedony
sedimentary
Fossil Shark Tooth
Chondrichthyes (Class)
fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Small purple quartz crystal, likely amethyst
Amethyst: violet variety of quartz, silicon dioxide (SiO₂)
gemstone
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Iron Meteorite
Siderite (Iron-Nickel Meteorite)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Diamond (or Diamond Simulant like Cubic Zirconia)
Carbon (C) - if Diamond; Zirconium dioxide (ZrO2) - if Cubic Zirconia
mineral
Fossil shell fragment
Indeterminate molluscan bioclast, likely aragonite or calcite
fossil
Lapis Lazuli
Lapis lazuli (a rock primarily composed of Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Likely weathered mica schist fragment
Mica schist, chiefly muscovite/biotite mica with quartz and feldspar
metamorphic