Druzy Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary Or Igneous (Host Environment)
Browse sedimentary or igneous (host environment) specimens identified by the Rock Identifier community.
Learn about Sedimentary Or Igneous (Host Environment) in the encyclopedia
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Ironstone Concretion (Limonite/Goethite)
Ironstone (composed primarily of Goethite FeO(OH) and Limonite)
sedimentary
Limestone
Sedimentary rock composed primarily of Calcite (CaCO3)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Vein in Gneiss/Granite
Silicon Dioxide (SiO2) in Feldspar-Quartz Gneiss host rock
metamorphic
Pegmatite (Granitic Pegmatite with Quartz, Mica, and Tourmaline/Biotite)
Pegmatite
igneous
Carnelian (Orange Agate)
Silicon Dioxide (SiO2)
mineral
Copper-bearing basalt or volcaniclastic rock
Cuprite–malachite-bearing mafic volcanic rock; likely basalt with copper sulfides/oxides
igneous
Granite Pegmatite
Pegmatite (Quartz, Feldspar, Mica)
igneous
Concretion
Sedimentary Concretion
sedimentary
Ruby (Raw/Rough)
Corundum (Al2O3 with Chromium trace)
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Amber-bearing Coal/Sedimentary Rock
Bituminous coal or carbonaceous siltstone with Fossilized Tree Resin (C10H16O)
sedimentary
Quartz Vein in Granite
Crystalline Silicon Dioxide (SiO2) in Granitic Matrix
mineral/igneous
Veined Quartzite / Vein-filled Sedimentary Rock
Siliciclastic rock with iron oxide-filled fractures
sedimentary
Raw greenish crystal/mineral fragment
Uncertain from image; possibly olivine (forsterite-rich), epidote, or green tourmaline
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Peridot in Basalt
Olivine ((Mg, Fe)2SiO4) in Basalt
mineral
Pyrite in Slate
Iron Disulfide (FeS2) in Low-grade Metamorphic Rock
metamorphic
Ferruginous Quartz / Iron-Stained Quartz
Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)
mineral
Quartz (Milky or Smoky variant)
Silicon Dioxide (SiO2)
mineral
Yellow Quartz (Citrine Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Mica (Biotite or Phlogopite variety)
Phyllosilicate (complex mineral formula involving K, Mg, Fe, Al, Si, and O)
mineral
Jasper with Quartz Veining
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartz with Calcite / Geode Fragment
Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3)
mineral
Quartz in Matrix
Silicon Dioxide (SiO2) in host rock matrix
mineral
Amethyst (Tumbled)
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Host Rock
Silicon dioxide (SiO2) veining in silicate matrix
sedimentary
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral with metamorphic or sedimentary host
Quartz with Schorl (Black Tourmaline)
Silicon Dioxide (SiO2) with Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Milky quartz
Quartz (SiO₂), likely massive milky quartz with minor iron-oxide staining and inclusions
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral / Sedimentary
River Stone (Granitic Gneiss)
Foliated Granitic Gneiss
metamorphic
General Gravel (River Rock/River Stones)
Mixed Lithic Sediments (Conglomerate Clasts)
sedimentary
Granitic Pegmatite with Tourmaline/Chlorite
Pegmatite
Igneous
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Quartz-rich pegmatite fragment
Granite-family pegmatite; chiefly quartz (SiO₂), feldspar, and black mica (biotite)
igneous
Jasper with Quartz Veining
Microcrystalline quartz (SiO2) with iron oxide impurities
sedimentary
Jasper with Quartz Veining
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Greenstone / Greenschist
Greenschist (contains chlorite, epidote, actinolite)
metamorphic