Sand Grain (Silica/Quartz Grain)
Silicon Dioxide (SiO2)
sedimentary
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
View all →
Gneiss
Gneiss
metamorphic
Mixed rounded stream pebbles
Most appear to be granitic and mafic igneous rocks, including granite, gneiss, basalt, and possibly quartzite; exact identification is uncertain from the image.
igneous
Gneiss (specifically Banded Gneiss)
Gneiss
metamorphic
Mixed mineral and rock specimens
Unidentified assortment; visible pieces may include rose quartz, green aventurine, quartz, and a gray crystalline rock, but the image is insufficient for exact identification.
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Crystal Fragment
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Botryoidal limonite/goethite nodule
Limonite (largely goethite, FeO(OH), with hydrated iron oxides)
mineral
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Golden Calcite
Calcium Carbonate (CaCO3)
mineral
Magnetite / Ironstone Pebble
Magnetite (Fe3O4)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Magnetite (Lodestone variety)
Magnetite (Fe3O4)
mineral
Gneiss (likely Granitic Gneiss)
Gneiss
metamorphic
Banded Gneiss
Gneiss (high-grade metamorphic silicate rock)
metamorphic
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Magnetite (Lodestone)
Magnetite (Fe3O4)
mineral
Gneiss
Gneiss
metamorphic
Foliated Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Rhodonite
Manganese inosilicate, (Mn,Fe,Mg,Ca)SiO3
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Gneiss
Gneiss
metamorphic
Metallic sulfide mineral specimen, likely pyrite
Pyrite (iron disulfide, FeS₂), possibly mixed with marcasite or chalcopyrite
mineral
Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Botryoidal hematite-rich iron ore (probable)
Hematite, Fe₂O₃, possibly mixed with goethite/limonite
mineral
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic