Quartz / Quartzite
Silicon Dioxide (SiO2)
Mineral / Metamorphic
Category
Igneous And Metamorphic Derivative (Weathered)
Browse igneous and metamorphic derivative (weathered) specimens identified by the Rock Identifier community.
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Quartzite Cobble / Quartzite Pebble
Quartzite (SiO2)
metamorphic
Gneiss
Gneiss (Metamorphic rock of variable composition, typically SiO2 rich)
metamorphic
Nephrite Jade (River Pebble)
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Basalt with Weathering Crust
Extrusive mafic volcanic rock
igneous
Muscovite Mica
Muscovite / KAl2(AlSi3O10)(OH)2
mineral
Hematite
Hematite (Fe2O3)
mineral
Basalt
Basalt (Mafic Extrusive)
igneous
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Yellow Quartzite (River Stone)
Quartzite (composed primarily of Quartz: SiO2)
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
Mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz (Common or Milky)
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
André Landed Here Rock (Glacial Erratic)
Granodiorite / Diorite (compositional estimate)
igneous
Calcite
Calcium Carbonate (CaCO3)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Citrine or Yellow Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Gneiss (likely)
Gneiss
Metamorphic
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Greasy Quartz (likely carved Milky Quartz or Aventurine)
Silicon Dioxide (SiO2)
mineral
Quartzite (Iron-stained)
Quartzite (mostly SiO2 with Fe2O3 impurities)
metamorphic
Biotite (Black Mica)
Biotite - K(Mg,Fe)3(AlSi3O10)(OH)2
mineral
White Moonstone (Feldspar)
Potassium aluminum silicate (KAlSi3O8)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Carnelian (Orange Chalcedony)
Silicon dioxide (SiO2)
mineral
Basalt
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Hypersthene
Hypersthene (formula: (Mg,Fe)SiO3)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Citrine Quartz
Citrine (Silicon Dioxide, SiO2)
mineral
Quartz (Yellow/Citrine variety)
Crystalline Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
Mineral