Gneiss (Cobble)
Gneiss
metamorphic
Category
Sedimentary Rock (Possibly Conglomerate Or Breccia With A Quartz Vein)
Browse sedimentary rock (possibly conglomerate or breccia with a quartz vein) specimens identified by the Rock Identifier community.
Basalt (with possible Calcite/Quartz veining)
Afanitic Mafic Igneous Rock
igneous
Mixed Quartz and River Pebbles (Stone Collection)
Mixed assortment containing mainly Silicon Dioxide (SiO2)
igneous, sedimentary, metamorphic, and mineral
Sandstone (Quartzose)
Arenite (SiO2 principal)
sedimentary
Chert (Tan/Yellow variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chert Nodule (Commonly known as a Flint or River Cobble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone
Arenite (SiO2 based with quartz, feldspar, or lithic fragments)
sedimentary
Quartz
Silicon Dioxide (SiO₂)
Mineral
Quartz (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Quartz Druze on Matrix (Geode Fragment)
Quartz (Silicon Dioxide, SiO2)
mineral
Vesicular Sandstone
Clastic Sedimentary Rock (Sandstone)
sedimentary
Sandstone with Foliose Lichen
Arenite (Rock matrix) with Xanthoparmelia or Flavoparmelia (Lichen genus)
sedimentary
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Sandstone with Iron Oxide Staining
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Chert (containing Quartz)
Microcrystalline Silica (SiO2)
sedimentary
Dalmatian Stone
Peralkaline Feldsphathic Igneous Rock
igneous
Glauconitic Sandstone (Greensand)
Glauconitic Quartz Arenite (containing Glauconite, (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Quartz (River Stone)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
Mineral/Sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone (with Iron Oxide)
Arenite with Limonite/Hematite staining
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst (Tumbled)
Quartz (Silicon Dioxide, SiO2) with iron impurities
mineral
Milky Quartz with Mineral Inclusions
Quartz (Silicon Dioxide - SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Sandstone (likely Navajo Sandstone)
Arenite (primarily SiO2)
sedimentary
Chert (Cherty Flint/Jasper variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
African Turquoise (Jasper)
Polychrome African Jasper (often marketed as 'African Turquoise' due to its color, but it is not true turquoise)
Rock
Sandstone (likely Quartzose Sandstone)
Arenite
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (SiO2)
sedimentary
Milky Quartz
Silicon dioxide (SiO2)
mineral
Chert (Chalk-associated Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (Geode-like)
Silicon Dioxide (SiO2)
Mineral
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
mineral
Geode (unopened)
Calcedony-lined Geode (SiO2)
sedimentary