Quartz
Silicon Dioxide (SiO2)
mineral
Category
Igneous And Metamorphic Derivative (Weathered)
Browse igneous and metamorphic derivative (weathered) specimens identified by the Rock Identifier community.
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White quartz pebble
Quartz (silicon dioxide, SiO₂), likely milky quartz
mineral
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Granite Pebble
Granite (Felsic intrusive igneous rock)
igneous
Quartzite Pebble (River Pebble)
Quartzite (SiO2)
metamorphic
Milky Quartz
Quartz (SiO2)
mineral
Basalt Pebble
Mafic Extrusive Igneous Rock
igneous
Quartz (likely a weathered/tumbled piece)
Quartz (SiO₂)
Mineral
Possible shale or slate fragment
Fine-grained clay-rich rock; possibly slate (low-grade metamorphosed shale)
metamorphic
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
River Pebble / Quartzite Rock
Metamorphic Quartzite (primarily SiO2)
metamorphic
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Black Tourmaline
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)
mineral
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
sedimentary
Quartzite
Metamorphic Quartzite
metamorphic
River Stone (likely Quartzite or Sandstone)
Metamorphosed Quartz-rich Rock (SiO2)
metamorphic
Quartzite / Sandstone
Quartzite (SiO2)
metamorphic
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Banded Agate
Silicon Dioxide (SiO2)
gemstone
Polished dark mineral fragments, likely hematite or magnetite
Hematite (Fe₂O₃) or magnetite (Fe₃O₄)
mineral
White Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Corundum (Sapphire variant)
Aluminium oxide (Al2O3)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz
SiO₂ (Silicon Dioxide)
Mineral
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Weathered quartz-rich rock, possibly quartzite
Quartzite (predominantly SiO₂), tentative identification
metamorphic
Tumbled garnet-bearing metamorphic rock (probable garnet schist)
Garnet schist; chiefly quartz, mica, feldspar, and almandine garnet (Fe₃Al₂Si₃O₁₂)
metamorphic
Red-and-gray granitic gneiss
Gneiss, composed mainly of quartz, feldspar, and mica with iron-oxide staining
metamorphic
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Common Opal
SiO2·nH2O (Hydrated Silicon Dioxide)
mineraloid
Quartz (Amethyst variety)
Silicon Dioxide (SiO2)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Hypersthene
Enstatite (Hypersthene variety), (Mg,Fe)SiO3
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Smoky Quartz
Silicon Dioxide (SiO₂)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral