Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Category
Mixed (Igneous, Sedimentary, Metamorphic, And Minerals)
Browse mixed (igneous, sedimentary, metamorphic, and minerals) specimens identified by the Rock Identifier community.
Learn about Mixed (Igneous, Sedimentary, Metamorphic, And Minerals) in the encyclopedia
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Tumbled green aventurine and/or serpentine
Quartz variety aventurine (SiO₂) and possibly serpentine-group minerals
mineral
Quartz pebble
SiO2
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Magnetite / Hematite (Iron Ore)
Magnetite (Fe3O4) or Hematite (Fe2O3)
mineral
Mixed beach pebbles; likely quartzite, granite, and iron-stained metamorphic rock
Predominantly quartzite (SiO₂), granite (quartz–feldspar–mica), and weathered iron-rich rock
metamorphic and igneous rocks
Kaolinite (Kaolin)
Kaolinite (Al2Si2O5(OH)4)
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Pale Rose or Milky Variety)
Silicon Dioxide (SiO2)
mineral
Serpentinite (likely serpentinized ultramafic rock)
Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), with possible magnetite, olivine, pyroxene, and talc
metamorphic
Biotite granite (likely weathered granite)
Granite; quartz + feldspar + biotite, with accessory dark minerals
igneous
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Polished ruby-in-fuchsite (probable)
Corundum (Al₂O₃) with green fuchsite mica (Cr-muscovite), possibly zoisite/amphibole
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Raw Specimen)
Silicon Dioxide (SiO2)
mineral
Graphite
Graphite (C)
mineral
Feldspathic Gneiss (Granite Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Granite Pebble (Pegmatitic Quartz-Feldspar River Rock)
Granite / Quartz-Feldspar-Mica Aggregate
igneous
Clear Quartz Point
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Banded Gneiss (Metamorphic Rock)
metamorphic
Mixed river gravel, prominently iron-stained chert/jasper
Microcrystalline quartz (SiO₂), chiefly chert/jasper with iron-oxide staining; mixed clasts may include quartzite and other silicates
sedimentary
Tumbled green jasper (probable serpentine-rich stone)
Jasper, microcrystalline quartz (SiO₂), possibly mixed with serpentine or chlorite
mineral
Quartzite with Mica / Gneiss Pebble
Metamorphic Rock (Quartz-Feldspar-Mica aggregate)
metamorphic
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Pink/Rose Quartz or Quartz Crystal)
Silicon Dioxide (SiO2)
mineral
Gneiss
Metamorphic Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Mixed tumbled gemstone collection
Varied minerals, likely including amethyst, sodalite/lapis lazuli, quartzite or aventurine, jasper, and agate/chalcedony
gemstone
Gneissic Schist
Gneiss-schist (Metamorphic rock)
metamorphic
Polished Hematite Tower
Hematite (Fe2O3)
mineral
Gneiss
Gneiss
metamorphic
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Possible magnetite fragment
Magnetite (Fe₃O₄), tentative identification
mineral
Quartz in Greenstone
Metamorphic rock with quartz vein (SiO2 / mixed silicates)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Mixed sedimentary rock and mineral specimens
Predominantly limestone, chert, sandstone, and iron-oxide-bearing clasts; exact identification requires testing
sedimentary