Agate
Silicon Dioxide (SiO2)
mineral
Category
Mineral (Found In Igneous And Metamorphic Rocks)
Browse mineral (found in igneous and metamorphic rocks) specimens identified by the Rock Identifier community.
Crystalline Quartz (Rough)
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Beach Pebble)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Milky Quartz Pebble
Quartz (Silicon Dioxide - SiO2)
mineral
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Mixed collection of minerals and rocks (Jasper, Carnelian, Granite, and Quartz)
Silicon Dioxide (SiO2) with varying impurities for silicates and igneous aggregates
igneous, sedimentary, and metamorphic
Quartzite
Quartzite (primarily SiO₂)
metamorphic
Banded Agate (with possible Chalcedony layers)
Silicon dioxide (SiO2)
sedimentary
Greenstone / Serpentinite
Serpentinite (composed primarily of minerals from the serpentine group Mg3Si2O5(OH)4)
metamorphic
Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Granite
Granite
igneous
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Mica Schist
Mica Schist (Composition typically contains Muscovite: KAl2(AlSi3O10)(OH)2 or Biotite: K(Mg,Fe)3AlSi3O10(OH)2 along with Quartz and Feldspar)
metamorphic
River Pebbles and Quartz
Mixed Igneous, Sedimentary, and Metamorphic Rocks (Silicon Dioxide SiO2 dominant)
mixed
Blue Lace Agate
Chalcedony (cryptocrystalline variety of Quartz), SiO2
mineral
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Agate Nodule / Weathered Chert
SiO2 (Silicon Dioxide - Microcrystalline Quartz)
Sedimentary / Mineral
Red Quartzite
Quartzite (SiO2)
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt with Secondary Infilling (e.g., Agate, Quartz, or Zeolite)
igneous
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Mica Schist
Mica Schist (primarily Muscovite and Biotite composition)
metamorphic
Nuummite
Antophyllite-Gedrite (Orthorhombic amphibole)
metamorphic
Amazonite
Amazonite (KAlSi3O8)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Orbicular Granite
Orbicular Granidiorite / Plutonic Igneous Rock
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Moonstone
Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8)
mineral
Zebra Rock / Zebra Marble
Banded Limestone-Marble Transition
metamorphic
Marble
Marble (primarily Calcite, CaCO3 or Dolomite, CaMg(CO3)2)
Metamorphic Rock
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Banded Agate (specifically Eye Agate / Chalcedony)
Agate (Cryptocrystalline variety of Quartz, SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
mineral
White Topaz
Aluminum Silicate Fluoride Hydroxide, Al2SiO4(F,OH)2
mineral
Galena
Lead Sulfide (PbS)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic plutonic rock (Felsic)
igneous