Hag Stone
Perforated sedimentary rock (typically limestone, sandstone, or flint)
sedimentary
Category
Mineral (Man Made Glass, Not Natural)
Browse mineral (man made glass, not natural) specimens identified by the Rock Identifier community.
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Shale with Iron Staining
Fissile Mudrock (Sedimentary Rock)
sedimentary
Fossilized Shark Tooth (Fragment)
Elasmobranchii gen. et sp. indet. (Calcium Phosphate / Apatite fossil)
fossil
Limonite with Hematite
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Picture Jasper
SiO2
Sedimentary/Mineral
Pumice
Pumice (a highly vesicular volcanic glass)
igneous
Polished blue chalcedony or glass-like quartz specimen
Chalcedony (microcrystalline SiO₂), possibly treated or synthetic; exact identification requires testing
gemstone
Dyed Blue Agate
Silicon Dioxide (SiO2) with artificial pigment
mineral
Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2)
mineral
River Cobble (Quartzite)
Meta-orthoquartzite
metamorphic
Granite
Phaneritic Plutonic Felsic Rock
igneous
Magnetite (Lodestone variety)
Magnetite (Fe3O4)
mineral
Granite
Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Pearl (with Peridot)
Calcium carbonate (CaCO3) + Conchiolin; Peridot: Magnesium iron silicate (Mg, Fe)2SiO4
mineral
Hag Stone
Perforated sedimentary rock (typically sandstone or limestone)
sedimentary
Granite
Phaneritic Plutonic Felsic Rock
igneous
Chert (Jasper/Flint variety)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Hagstone (Adder Stone)
Chert or Sedimentary pebble with natural perforation
sedimentary
Tektite (likely indochinite)
Natural silica-rich impact glass; predominantly amorphous SiO₂ with aluminum, iron, magnesium, calcium, and sodium
mineral
Granite
Phaneritic intrusive felsic igneous rock
igneous
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Red Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Calcite (likely chalky calcite fragment)
Calcite, calcium carbonate (CaCO₃)
mineral
Sandstone (with Iron Staining)
Sandstone (mainly Quartz, SiO2, with Iron Oxides like Goethite/Hematite)
sedimentary
Amethyst (Rough)
Silicon Dioxide (SiO2) with iron impurities
mineral
Sapphire
Corundum (Al2O3)
gemstone
Ruby (Raw/Rough)
Corundum (Al2O3 with Chromium trace)
mineral
Sandstone (lithic wacke)
Arenite / Lithic Wacke (mostly SiO2 with rock fragments)
sedimentary
Bandit Heart Pebble (Quartz-Veined Sedimentary Rock)
Quartz-veined siltstone or sandstone
sedimentary
Mixed Quartz and River Pebbles (Stone Collection)
Mixed assortment containing mainly Silicon Dioxide (SiO2)
igneous, sedimentary, metamorphic, and mineral
Quartzite
Metamorphic Rock (composed primarily of Quartz, SiO2)
metamorphic
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
mineral
Pink quartz beads (likely rose quartz)
Quartz, SiO₂; pink color commonly from trace inclusions or lattice defects
mineral
Likely polished dark pebble
Indeterminate; possibly basalt, black jasper, or a dark sulfide-rich stone
mineral
Banded Sedimentary Rock (Wishbone Stone / Banded Quartzite or Limestone)
Silicified limestone or banded sedimentary rock with mineral veins
sedimentary
Blue Quartzite (Aventurine variety)
Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebeckite
metamorphic
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Sodalite beads
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂, likely with minor lazurite/pyrite or calcite inclusions
mineral
Tumbled Stone
Silicon dioxide / Various silicates
mineral
Brecciated Jasper
SiO2 (Silicon Dioxide)
sedimentary
Colorless Gemstone (possibly Diamond or Cubic Zirconia)
C (Diamond) or ZrO2 (Cubic Zirconia)
gemstone
Red Sandstone
Sandstone (Quartz Arenite / Arkose with Hematite cement)
sedimentary