Limonite-stained Quartz / Quartzite
Silicon Dioxide (SiO2) with iron hydroxides (FeO(OH)·nH2O)
Category
Browse metamorphic rock (variety of quartz) specimens identified by the Rock Identifier community.
Limonite-stained Quartz / Quartzite
Silicon Dioxide (SiO2) with iron hydroxides (FeO(OH)·nH2O)
Quartz (Yellow/Citrine variety)
Silicon Dioxide (SiO2)
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
Quartz (Crystal/Druzy Quartz)
Quartz (SiO₂)
Vesicular Basalt (commonly mistaken for Slag)
Scoriaceous Basalt (composed primarily of Plagioclase Feldspar and Pyroxene)
Quartz in Matrix (possibly Basalt or Siltstone host)
Silicon Dioxide (SiO2) in Host Rock
River Cobble (likely Sandstone or Siltstone type)
Sandstone or Siltstone (common rock types that form river cobbles)
Granodiorite (Gneissic Pebble)
Granodiorite displaying minor foliation
Tiger's Eye (Tumbled Blue/Black-Golden variety)
Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)
Schist
Mica Schist (Quartz-Muscovite-Biotite Schist)
Chalcedony (Grey/White Agate)
Silicon Dioxide (SiO₂)
Milk Quartz (Tumbled Pebble)
Quartz (Silicon Dioxide, SiO2)
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Sapphire (Corundum variety)
Sapphire (Al₂O₃)
Feldspar (specifically Orthoclase)
Potassium Aluminum Silicate (KAlSi3O8)
Garnet (Almandine/Pyrope series)
Garnet Group - X3Y2(SiO4)3
Geode (Unopened)
Siliceous Geode (SiO2)
Chalcedony
Silicon Dioxide (SiO2)
Slate with Quartz
Low-grade Metamorphic Slate with SiO2 inclusions
Crazy Lace Agate
Silicon Dioxide (SiO2) with iron and aluminum inclusions
Citrine
Silicon Dioxide (SiO2)
Pyrite
Iron Sulfide (FeS2)
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
Pyrite in Matrix
Iron Disulfide (FeS2)
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
Quartzite Pebble (River Rock)
Quartzite (SiO2)
Chert (varietal: Jasper or Flint likely, but definitive identification is difficult from image)
SiO₂ (silicon dioxide)
Chert (varietal Chalcedony or Flint)
Silicon dioxide (SiO2) - Microcrystalline Quartz
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
Milky Quartz
Silicon Dioxide (SiO2)
Schist
Schist (metamorphic rock)
Sandstone
Sandstone (various mineral compositions)
Conglomerate
Conglomerate (Clastic Sedimentary Rock)
Citrine
Citrine (Silicon Dioxide - SiO2)
Gneiss
High-grade regional metamorphic rock (Foliated)
Quartzite
Metamorphic Quartz (SiO2)
Quartzite
Quartzite
Carnelian Agate
Silicon Dioxide (SiO2)
Greenstone with Epidote or Quartz Vein
Epidiorite or Metabasalt (composed largely of Chlorite, Epidote, and Amphibole)
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)