Milky Quartz
Quartz (SiO2) with iron staining
mineral
Category
Sedimentary Or Igneous (Host Environment)
Browse sedimentary or igneous (host environment) specimens identified by the Rock Identifier community.
Sandstone (Pebble/Conglomerate fragment)
Sandstone (clastic sedimentary rock)
Sedimentary Rock
Quartz (Milky or Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based typically)
sedimentary
Crackle Agate / Dyed Quartz
SiO2 (Silicon Dioxide)
mineral
Granite Gneiss
Granitic Gneiss
Metamorphic
Greenschist
Greenschist facies metamorphic rock
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Garnet (Almandine/Pyrope variety)
Silicate mineral group; typically Fe3Al2(SiO4)3 (Almandine) or Mg3Al2(SiO4)3 (Pyrope)
mineral
Gneiss
Gneiss
metamorphic
Pyrite
Iron Disulfide (FeS2)
mineral
Magnetite (likely with weathered Limonite/Hematite)
Magnetite (Fe3O4) with iron oxide weathering
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Quartz Geode
Silicon dioxide (SiO2)
mineral
Gneiss (specifically Banded Gneiss)
Gneiss
metamorphic
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Gneiss (Cobble)
Gneiss
metamorphic
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
mineral
Pyrite (on Quartz matrix)
Iron Sulfide (FeS2)
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Quartz (Grain/Fragment)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Clear/White Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (Metamorphic high-grade, predominantly SiO2, Al2O3, K2O, Na2O)
metamorphic
Pyrite (on Quartz matrix)
Iron Sulfide (FeS2)
mineral
Mica-rich Schist fragment
Mica Schist
metamorphic
Gneiss (specifically Micaceous Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Muscovite Mica
KAl2(AlSi3O10)(F,OH)2
mineral
Brown Sandstone
Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)
sedimentary
Quartz (likely Clear Quartz or Rock Crystal)
Quartz (SiO2)
Mineral
Amethyst Geode (polished heart-cut)
Silicon Dioxide (SiO2) with iron impurities
mineral
Sandstone
Arenite
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Stone/Ocher)
Limonite (FeO(OH)·nH2O)
mineral
Jasper (likely Iron-stained)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Porphyry
Porphyritic Rhyolite/Andesite
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Aragonite (Flos Ferri)
Calcium Carbonate (CaCO3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral