Quartz (Iron-stained or Milky)
Silicon Dioxide (SiO2)
mineral
Category
Man Made Byproduct (Often Mistaken For Obsidian Or Emerald)
Browse man made byproduct (often mistaken for obsidian or emerald) specimens identified by the Rock Identifier community.
Learn about Man Made Byproduct (Often Mistaken For Obsidian Or Emerald) in the encyclopedia
View all →
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Anthropogenic Heat Source (Electronic/Industrial Interface)
Thermal IR emission (Electronic infrastructure)
not a rock or mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Orange Calcite
Calcite (Calcium Carbonate - CaCO3)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Quartzite (Iron-stained)
Quartzite (SiO2 with iron oxides)
metamorphic
Trace Fossil (Lichenandites or Rhynie Chert Chert with Microfossils)
Trace fossil in microcrystalline quartz (SiO2)
fossil
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Basalt
Basalt (Mafic volcanic rock)
igneous
Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (70% or more silicon dioxide)
Igneous
Likely banded obsidian or dark volcanic glass
Obsidian, predominantly rhyolitic volcanic glass (SiO₂-rich), possibly with devitrified bands and phenocrysts
igneous
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Emerald
Beryl (Be3Al2(SiO3)6)
gemstone
Aragonite
Aragonite (Calcium Carbonate - CaCO3)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Jadeite
Jadeite (NaAlSi2O6)
gemstone
Gemstone jewelry ensemble
Likely mixed gemstone and glass-bead jewelry; exact stones cannot be determined from the image
gemstone
Emerald
Beryl (Be3Al2(SiO3)6)
gemstone
Emerald
Beryl (Be3Al2(SiO3)6)
gemstone
Blue Dumortierite in Quartz
Al7(BO3)(SiO4)3O3 (Dumortierite)
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
gemstone
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
gemstone
Limestone
Sedimentary Rock (Primarily CaCO3)
sedimentary
Quartzite
Metamorphic quartz rock (SiO2)
metamorphic
Chert (Jasper)
Microcrystalline Quartz (SiO2) with Iron Oxide impurities
sedimentary
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Obsidian (volcanic glass)
Obsidian, naturally occurring rhyolitic volcanic glass; composition is silica-rich, commonly about 70–75% SiO₂
igneous
Tumbled dark-green serpentine
Serpentinite; chiefly serpentine-group minerals, commonly antigorite, lizardite, or chrysotile (Mg₃Si₂O₅(OH)₄)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite (Gold-toned)
Crystalline Quartz Metamorphite (SiO2)
metamorphic
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
gemstone
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Apache Tear
Obsidian (Hydrated Silica / Amorphous Volcanic Glass)
igneous
Quartzite with Hematite staining
Quartzite (SiO2)
metamorphic
Sandstone (Pebble)
Sandstone (SiO2 with matrix/cement)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Tiffany Stone
Bertrandite-Bearing Fluorite Hyalite Opal
metamorphic