Shale or Argillite
Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)
Sedimentary or Metamorphic (low grade)
Category
Metamorphic (Man Made)
Browse metamorphic (man made) specimens identified by the Rock Identifier community.
Aquamarine and clear quartz
Aquamarine (Be3Al2Si6O18), Quartz (SiO2)
Mineral
Quartz (variety of colors)
SiO2 (Silicon Dioxide)
Mineral
Green Slag Glass (Cullet)
Amorphous Silica (Industrial Glass Byproduct)
Synthetic/Byproduct (Non-igneous, non-sedimentary, non-metamorphic)
Sandstone
Arenite (general term for sandstone)
Sedimentary Rock
Quartz (River-worn Pebble)
Quartz (SiO2)
Mineral
Quartz (Druzy) in host rock
SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)
Mineral
Amethyst Geode/Cluster
Quartz (SiO2) - variety Amethyst
Mineral
Quartz (in matrix)
Quartz (SiO₂)
mineral
Pyrite
Pyrite (Iron sulfide, FeS₂)
mineral
Beryl (Variety Mix)
Be3Al2(Si6O18)
Mineral
Quartz
Quartz (SiO₂)
Mineral
Quartzite
Quartzite (primarily composed of SiO O₂)
Sedimentary Rock
Chalcedony (Banded/Mottled Variety)
Chalcedony (a cryptocrystalline variety of Quartz, SiO2)
Mineral
Sandstone
Quartz Arenite (a common type of sandstone, given the appearance), Arkose, Greywacke (depending on mineralogy)
Sedimentary Rock
Sapphire (likely blue synthetic sapphire or blue glass in a ring)
Corundum (Al₂O₃), specifically the blue variety due to trace amounts of iron and titanium impurities. If synthetic, it would still be Al₂O₃.
Mineral
Rutilated Quartz (likely Citrine or Smoky Quartz with Rutile inclusions)
SiO2 with TiO2 inclusions (Quartz with Rutile)
Mineral
Jasper (yellow/cream variety)
SiO₂ (Cryptocrystalline Quartz)
Sedimentary
Lapis Lazuli (blue bead) and Moss Agate (green heart)
Lapis Lazuli (lazurite-based rock) and Moss Agate (SiO2 with manganese/iron inclusions)
metamorphic (Lapis) and sedimentary/igneous assoc. (Moss Agate)
Chert (Flint)
Chert (predominantly SiO₂ - silicon dioxide)
sedimentary