Milky quartz (possibly quartz-rich vein rock)
Quartz, silicon dioxide (SiO₂)
mineral
Category
Not A Geological Specimen
Browse not a geological specimen specimens identified by the Rock Identifier community.
Learn about Not A Geological Specimen in the encyclopedia
View all →
Conglomerate
Conglomerate Sedimentary Rock
sedimentary
Quartz (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Siltstone
SiO2 (Quartz) on clastic sedimentary matrix
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Eclogite
Eclogite (Omphacite + Pyrope)
metamorphic
Mica Schist with Pyrite
Mica Schist (FeS2 containing)
metamorphic
Desert Rose
Gypsum (CaSO4·2H2O) or Barite (BaSO4) inclusions in sand
mineral
Stromatolite
Biogenic Sedimentary Rock (Precambrian Stromatolite fossil)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement) SiO2
sedimentary
Gold-Bearing Quartz Ore
Crystalline Silicon Dioxide (SiO2) with Trace Aurum (Au)
mineral
Pale limestone or calcite-rich rock
Calcite (CaCO₃), likely micritic limestone
sedimentary
Basalt with Iron Oxide staining
Basalt (Mafic volcanic rock)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Pyritic Gneiss (with Garnet)
Gneiss containing Pyrite (FeS2) and Almandine Garnet (Fe3Al2(SiO4)3)
metamorphic
Jasper Conglomerate
Jasperoid Conglomerate (predominantly SiO2 with iron oxide impurities)
sedimentary
Petrified Coral (Agatized Coral)
Anthozoa (Agatized Fossil)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Sandstone with Liesegang Rings
Arenite with Iron Oxide Concretions
sedimentary
Tumbled blue glassy mineral specimen, possibly blue calcite or dyed quartz
Uncertain from image; likely calcite (CaCO₃) or dyed microcrystalline quartz (SiO₂)
mineral
Quartz-rich geode or drusy quartz specimen
Quartz, silicon dioxide (SiO₂), likely coating a carbonate or volcanic-rock cavity
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Banded Chert with Quartz Veining
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron disulfide (FeS2)
mineral
Fossilized ammonite fragment
Ammonoidea; likely an ammonite suture-section specimen, commonly Jurassic–Cretaceous
fossil
Quartz (Rock Crystal) with minor impurities
Quartz (SiO2)
Mineral
Orange-brown tumbled mineral specimen
Indeterminate; possibly iron-stained chalcedony, quartz, or jasper
mineral
Weathered quartz-bearing rock, possibly granitic gneiss
Quartz–feldspar–mica aggregate; exact identification requires testing
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz Vein Rock
Silicon Dioxide (SiO2)
mineral
Porphyritic Basalt
Porphyritic Basalt (with plagioclase phenocrysts)
igneous
Weathered Sandstone / Quartzite
Quartz Arenite
sedimentary
Painted Sandstone Cobble
Clastic Sedimentary Rock (Sandstone base)
sedimentary
Banded Agate
Cryptocrystalline Quartz (SiO2)
mineral
Man-made Synthetic Material (Plastic/Composite)
Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)
Non-geological / Synthetic