Agate in Rhyolite
Silicon Dioxide (Quartz/Chalcedony) in Volcanic Rock matrix
igneous
Category
Sedimentary Or Igneous (Host Environment)
Browse sedimentary or igneous (host environment) specimens identified by the Rock Identifier community.
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Quartz Veined Basalt
Mafic Volcanic Rock with Microcrystalline Quartz (SiO2)
igneous
Diabase (Dolerite)
Mafic intrusive igneous rock
igneous
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Quartz Vein
Silicon Dioxide (SiO2)
Mineral
Greenstone
Metabasalt / Chlorite schist
metamorphic
Tumbled red jasper
Jasper, microcrystalline quartz (SiO₂), commonly colored by iron oxides
mineral
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Garnet (Almandine)
Almandine Garnet (Fe3Al2(SiO4)3)
gemstone
Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Quartz-veined Siltstone
Siltstone with Quartz (SiO2) veins
sedimentary
Banded gneiss pebble
Gneiss, typically quartz–feldspar–mica assemblage
metamorphic
Labradorite (tumbled)
Labradorite (a plagioclase feldspar mineral between anorthite and albite; chemical formula: (Ca,Na)(Si,Al)4O8)
Mineral
Quartz Vein in Schist / Gneiss
Silicon Dioxide (SiO2) in Metamorphic Matrix
igneous
Ruby (Cabochon)
Corundum (Al2O3)
gemstone
Pegmatite (Quartz and Feldspar)
Igneous Pegmatite containing SiO2 and KAlSi3O8
igneous
Quartz-bearing Pegmatite with Metallic Sulfides
Pegmatite / Quartz-Feldspar Matrix with Pyrite and Mica
igneous
Agate
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Pyrite-bearing rock (likely pyrite-rich schist or sulfide ore)
Pyrite, FeS₂, dispersed in a dark metamorphic or hydrothermal host rock
mineral
Feldspar (Orthoclase)
Potassium Alveolar Silicate (KAlSi3O8)
mineral
Milky quartz vein rock
Quartz, silicon dioxide (SiO₂), likely with iron-oxide staining and minor mica or sulfide minerals
mineral
Quartz Vein in Matrix
Silicon Dioxide (SiO2) within Rhyolitic or Granitic Matrix
igneous
Quartz-rich pegmatite (likely feldspar–quartz rock)
Granitic pegmatite; predominantly quartz (SiO₂) and feldspar, with possible mica and iron-oxide staining
igneous
Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in a sedimentary host
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
K2 Stone
Azurite in Granite
igneous
Pegmatite with muscovite mica
Granitic pegmatite; quartz (SiO₂), feldspar, and muscovite (KAl₂(AlSi₃O₁₀)(OH)₂), locally biotite/tourmaline
igneous
Quartz-rich granitic pegmatite fragment
Pegmatite, composed mainly of quartz (SiO₂), feldspar, and mica
igneous
Pegmatitic granite (likely feldspar–quartz–mica rock)
Granitic pegmatite; chiefly K-feldspar and quartz, with mica and iron-oxide staining
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt with Secondary Mineral Amygdules
igneous
Sandstone Concretion
Carbonate-cemented Sandstone Concretion
sedimentary
Quartz Geode (Smoky Quartz)
Silicon Dioxide (SiO2)
mineral
Carnelian
Silicon dioxide (chalcedony variety), SiO2
gemstone
Carnelian
Carnelian (Silicon Dioxide - SiO2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Blue Quartz with Dumortierite/Magnesio-riebeckite inclusions
Quartz (SiO2) containing Dumortierite (Al7(BO3)(SiO4)3O3)
igneous/metamorphic
Serpentinite
Serpentinite (Hydrated magnesium iron phyllosilicate)
metamorphic
Yellow Jasper
Silica (Silicon Dioxide, SiO2) with iron inclusions
sedimentary