Quartzite
Quartzite (SiO2)
Metamorphic
Category
Metamorphic Rock (Variety Of Quartz)
Browse metamorphic rock (variety of quartz) specimens identified by the Rock Identifier community.
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Blue Sapphire
Corundum (Al2O3)
mineral
Chert Nodule (Flint)
Chert (Cryptocrystalline Silica - SiO2)
sedimentary
Unakite or Epidosite
Epidosite (Mineral composition: Epidote, Feldspar, and Quartz)
metamorphic
Quartz (Milky/Smoky variety)
Silicon Dioxide (SiO2)
mineral
Chert (Nodular)
Chert (SiO2 - Microcrystalline Quartz)
sedimentary
Quartz (Milky/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Serpentine
Antigorite / Lizardite / Chrysotile mix; (Mg, Fe)3Si2O5(OH)4
metamorphic
River Stone (likely Quartzite or Chert)
Recrystallized Silicon Dioxide (SiO2)
metamorphic
Banded Calcite (often sold as 'Mexican Onyx')
Calcite (Calcium Carbonate, CaCO3)
Mineral / Sedimentary Rock
Snowflake Obsidian
Vitreous Volcanic Rock (Amorphous Silicate), SiO2
igneous
Iron-stained Quartzite
Quartzite with Limonite/Hematite staining (SiO2 with FeO(OH)·nH2O)
metamorphic
Pebble (likely Quartz or Chert)
SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.
Sedimentary Rock
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Rutilated Quartz
Quartz (SiO2) with Rutile (TiO2) inclusions
Mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Blue Aventurine
Silicon Dioxide (SiO2) with inclusions of Dumortierite
Mineral (silicate variety)
Banded Agate (specifically Lake Superior Agate style)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Dalmatian Stone
Dalmatian Jasper (a misnomer) / Perthitic Igneous Rock
igneous
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (Milky/Crystal variety)
Silicon Dioxide (SiO2)
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
Mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Amethyst
SiO2 (Silicon Dioxide)
Mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Pink Quartzite Pebble
Metamorphic Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Leopard Skin Jasper
Jasper (Silicon Dioxide with impurities), SiO2
sedimentary
Quartz in Matrix (possibly with Biotite or Hornblende)
Quartz (Silicon Dioxide, SiO2) in Granitic Matrix
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite River Rock
Quartzite (Silicon Dioxide, SiO2)
metamorphic
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Sedimentary or Metamorphic (low-grade)
Raw Emerald
Beryl (Be3Al2(SiO3)6) with Cr/V impurities
mineral
Banded Gneiss
Gneiss (Metamorphic high-grade rock)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Serpentine
Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Jasper (specifically Red or Brecciated Jasper variant)
Jasper (Microcrystalline Quartz - SiO2)
sedimentary
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Feldspar
KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8
mineral