Quartzite
Quartzite (primarily SiO2)
metamorphic
Category
Rock
Browse rock specimens identified by the Rock Identifier community.
Petrified Wood
Silicified Wood (primarily Chalcedony or Quartz, SiO2)
sedimentary
Malachite and Azurite on Matrix
Cu2CO3(OH)2 (Malachite) / Cu3(CO3)2(OH)2 (Azurite)
mineral
Chert (Smooth River Pebble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Chert / Flint Nodules in Sandstone
Microcrystalline Quartz (SiO2) within Clastic Sedimentary Rock
sedimentary
Turquoise
Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Quartz Vein in Host Rock (clastic sediment)
Silicon Dioxide (SiO2) in matrix
sedimentary
Schist (Micaceous Schist)
Schist (comprising Muscovite/Biotite mica, Quartz, and Feldspar)
metamorphic
Larimar
Blue Pectolite (NaCa2Si3O8(OH))
mineral
Garnet (Almandine)
Almandine, Fe3Al2(SiO4)3
metamorphic
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Olivine in Basalt (Peridotite Xenolith)
Forsterite-rich Olivine (Mg2SiO4) in Aphanitic Basalt
igneous
Chrysocolla in Jasper (Chryso-Jasper)
Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O (Chrysocolla) + SiO2 (Jasper)
mineral
Chert (Grey-Green Flint)
Microcrystalline silicon dioxide (SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Grey River Stone (Quartz-rich Quartzite/Siltstone)
Quartzite / Meta-siltstone (primarily SiO2)
Metamorphic (low-grade)
Pegmatite
Granitic Pegmatite
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Pumice
Vesicular Rhyolite (highly vesicular igneous volcanic rock)
igneous
Blue Lace Agate
Chalcedony (a form of Quartz) - SiO2
Mineral
Biotite Mica in Host Rock
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Chalk (Calcitic)
Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock
sedimentary
Schist with Quartz Vein
Mica Schist with Crystalline Quartz (SiO2)
metamorphic
Sandstone Pebbles
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary
Pink Granite
Phaneritic intrusive igneous rock (K-feldspar rich)
igneous
Oolitic Chert
Silicon Dioxide (SiO2) with Oolitic texture
sedimentary
Sandstone (likely Quartzose)
Arenite (primarily SiO2)
sedimentary
Basalt with Secondary Mineralization (Likely Zeolites or Calcite)
Aphanitic mafic volcanic rock with secondary mineral inclusions (e.g., CaAl2Si3O10·3H2O for Scolecite)
igneous
Quartzite (Milky)
Metamorphic rock predominantly composed of Quartz (SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
Mineral in Metamorphic/Igneous Host
Unakite (or Epidotized Granite)
Epidotized Granite (Composition: KAlSi3O8, Ca2(Al,Fe)3(SiO4)3(OH), SiO2)
metamorphic
Granite
Granite (Phaneritic Quartz-Feldspar Rock)
igneous
Sandstone
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
River Pebble (Quartz-rich)
Silicon Dioxide (SiO2) with various inclusions
sedimentary
River Quartzite Siltstone
Quartz-rich Meta-siltstone (SiO2 dominated)
metamorphic
Sandstone (Quartz-rich)
Clastic sedimentary rock (SiO2 primary)
sedimentary