Milky Quartz
Silicon Dioxide (SiO2)
mineral
Category
Minerals
Browse minerals specimens identified by the Rock Identifier community.
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White Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossilized Coral (Favosites)
Favosites (extinct genus of tabulate coral)
sedimentary
Slate
Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
sedimentary
Orbicular Jasper (Eye Jasper / Kambaba-like pattern)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Tree Agate
Silicon Dioxide (SiO2) - Dendritic Agate/Chalcedony
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Granitic Quartz or Pegmatite
Quartz with Orthoclase Feldspar (SiO2 + KAlSi3O8)
igneous
Quartz (Milky or White Quartz)
Silicon Dioxide (SiO2)
mineral
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Travertine (Calcareous Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Ironstone Concretion (Moqui Marble)
Ironstone concretion (Fe2O3 with a sandstone core)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Ocean Jasper
Spherulitic Chalcedony (SiO2)
mineral
Red aventurine
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
metamorphic
Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Granite Pebble
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Pyrite-rich Gossan
Iron Sulfide (FeS2) in Ore Matrix
mineral
Limonite (Hydrated Iron Oxide / Bog Iron)
FeO(OH)·nH2O
Mineral (Sedimentary context)
Blue Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Sandstone (with Iron Staining)
Clastic sedimentary rock (SiO2 with Fe2O3 oxides)
sedimentary
Diorite
Intermediate plutonic igneous rock
Igneous
Gossan (Iron Hat)
Limonitic Gossan (predominantly FeO(OH)·nH2O)
igneous/metamorphic derivative
Slate
Foliated Metamorphic Slate
metamorphic
Banded Gneiss
Gneiss (Metamorphic high-grade, predominantly SiO2, Al2O3, K2O, Na2O)
metamorphic
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with iron oxide inclusions/staining (Limonite/Hematite)
Mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock including secondary mineral infills)
Igneous
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions (Hematite/Goethite)
mineral
Botryoidal Chalcedony (Agate)
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Mica Schist with Quartz
Mica Schist (principally Muscovite and Biotite with Quartz veins)
metamorphic
Chert (White Chert/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert (and Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Desert Rose Selenite (Gypsum)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral