Tiger's Eye (Gold/Brown variety)
Silicon dioxide (SiO2) with fibrous crocidolite inclusions
metamorphic
Category
Metamorphic Rock (Variety Of Quartz)
Browse metamorphic rock (variety of quartz) specimens identified by the Rock Identifier community.
Quartz Vein in Host Rock (Gossanous Matrtix)
Silicon Dioxide (SiO2) with iron oxides (Limonite/Hematite)
mineral
Conglomerate
Conglomerate (Clastic sedimentary rock)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz Vein in Host Rock (Pebble)
Quartz (SiO2) with sandstone or siltstone matrix
metamorphic/igneous transition
Conglomerate
Conglomerate (Sedimentary Clastic Rock)
sedimentary
Amethyst (Chevron or Banded Amethyst)
Silicon Dioxide (SiO2) with iron impurities
mineral
Chert (Flint Nodules)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (White Chert/Flint)
Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)
sedimentary
Chert (Jasper)
Chert / Microcrystalline Quartz (SiO2)
sedimentary
Conglomerate
Conglomerate (Detrital Sedimentary Rock)
sedimentary
Banded Agate (Onyx type)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Chert (varietal Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite (River Cobble)
Quartzite (SiO2)
metamorphic
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Geode (likely within Limestone or Dolomite matrix)
Quartz (SiO₂)
Mineral within a Sedimentary Rock
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Chert
Chert (microcrystalline quartz)
sedimentary
Orange Quartzite (River Pebble)
Quartzite (SiO2 with Iron Oxide inclusions)
metamorphic
Banded Chalcedony (Agate)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Granitic Gneiss
Gneiss (Polymetamorphic Granitic Gneiss)
metamorphic
Chert (specifically Flint or Dark Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Epidosite (Epidote-rich rock)
Epidotalite (primarily Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Banded Jasper (possibly "Picture Jasper")
Jasper (a microcrystalline variety of Quartz / Silicon Dioxide - SiO2)
Sedimentary rock (specifically a chemical sedimentary rock, or a chert if considered purely mineral aggregate)
Quartz
Quartz (SiO₂)
Mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granite (with alteration)
Granite (Felsic intrusive igneous rock)
igneous
Chert (Nodule)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Wishing Stone (Quartz-Veined Pebble)
Hydrothermal Quartz in Metasedimentary Matrix (SiO2/Matrix)
metamorphic
Red Quartz (Carnelian/Red Jasper Agate)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Sandstone (Pebble/Cobble)
Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)
Sedimentary
Gabbro
Gabbro (mafic intrusive igneous rock)
igneous
Sandstone (likely Greywacke or Lithic Sandstone)
Arenite / Wacke
sedimentary
Blue Lace Agate
Silicon Dioxide (SiO₂)
Mineral (Variety of Chalcedony/Quartz)
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Quartzite Beach Pebble
Quartzite (primarily SiO2)
metamorphic
Granite (Pink/Red variety)
Phaneritic Felsic Intrusive Igneous Rock (composed primarily of Quartz, K-Feldspar, and Plagioclase)
igneous
Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
metamorphic
Chert
Silicon dioxide (SiO2)
sedimentary