Dyed blue tumbled stone, likely howlite or magnesite
Howlite (Ca₂B₅SiO₉(OH)₅) or magnesite (MgCO₃), artificially dyed blue
mineral
Category
Metamorphic Rock (For Both Nephrite And Jadeite)
Browse metamorphic rock (for both nephrite and jadeite) specimens identified by the Rock Identifier community.
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Chert (Green Fossilized Algae or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral side of metamorphic/igneous sources
Shale or Argillite
Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)
Sedimentary or Metamorphic (low grade)
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Polished carnelian/chalcedony agate
Microcrystalline quartz (SiO₂), chiefly chalcedony with iron-oxide coloring
mineral
Quartz (Milky/Smoky variety on matrix)
Silicon Dioxide (SiO2)
mineral
Herkimer Diamond
Double-Terminated Quartz (SiO2)
mineral
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
Black Tourmaline (Schorl)
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)
mineral
Tumbled green serpentine (probable)
Serpentine-group minerals, chiefly antigorite/lizardite; commonly Mg₃Si₂O₅(OH)₄
metamorphic
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Quartz (Druzy or Geode fragment)
Silicon Dioxide (SiO2)
mineral
Polished brecciated jasper/chalcedony
Microcrystalline quartz (SiO₂), likely jasper with chalcedony and iron-oxide inclusions
mineral
Tumbled green-brown stone, likely serpentine
Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite
metamorphic
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Small quartz crystal fragment (probable)
Quartz, silicon dioxide (SiO₂)
mineral
Siltstone (Yellow/Brown Sandstone or Siltstone)
Siltstone / Fine-grained Sandstone (rich in iron oxides like limonite)
sedimentary
Fossil bivalve shell fragment
Likely a ribbed oyster or scallop-type bivalve; exact genus requires locality and preservation details
fossil
Granodiorite (or Granite) Pebble
Phaneritic Felsic Igneous Pebble
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (on Granite)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Jasp-Agate
Cryptocrystalline Quartz (SiO2) with Iron Oxide inclusions
sedimentary
Serpentine-rich metamorphic cobble
Serpentinite, principally antigorite/lizardite Mg3Si2O5(OH)4, possibly with magnetite and minor carbonate
metamorphic
Red and Yellow Jasper
Silicon Dioxide (SiO2)
sedimentary
Tumbled serpentine (likely)
Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; approximate formula Mg₃Si₂O₅(OH)₄
metamorphic
Pyrite
Iron Pyrite (FeS2)
Mineral
Chert (varieties include Flint and Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz (Herkimer Diamond variant)
Silicon Dioxide (SiO2)
mineral
Lichen-covered granite
Granite, chiefly quartz–feldspar–mica; surface colonized by lichens
igneous
Actinolite
Ca2(Mg,Fe)5Si8O22(OH)2
mineral
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Ironstone (iron-oxide-rich rock)
Ferruginous ironstone, likely limonite/goethite-rich; exact identification requires testing
sedimentary
Clear Quartz (Double Terminated)
Silicon Dioxide (SiO2)
mineral
Schorl (Black Tourmaline) in Quartz Matrix
Schorl: NaFe3Al6(BO3)3Si6O18(OH)4 (Complex Borosilicate)
mineral