Milky Quartz
Silicon Dioxide (SiO2)
mineral
Category
Mineral (Specifically A Variety Of Chalcedony, Which Is A Cryptocrystalline Quartz)
Browse mineral (specifically a variety of chalcedony, which is a cryptocrystalline quartz) specimens identified by the Rock Identifier community.
Amygdaloidal Basalt with Epidote/Chlorite
Basalt (containing (Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)))
igneous
Chert (Pebble)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (varietal: Jasper or Flint likely, but definitive identification is difficult from image)
SiO₂ (silicon dioxide)
Sedimentary
Chert / Flint
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Basalt with Epidote Veining
Basalt (Mafic Extrusive Rock) with Ca2(Al,Fe)3(SiO4)3(OH)
igneous
Honey Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Banded Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Petrified Wood (Agatized/Silicified Wood)
Silicified Wood (SiO2)
metamorphic
Ruby (Pinkish-Red)
Corundum (Al2O3 with Chromium trace)
mineral
Black Onyx
Silicon Dioxide (SiO2) with parallel banding
mineral
Chert (specifically Iron-stained River Cobble)
Silicon Dioxide (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz in Host Rock
Silicon Dioxide (SiO2) in Rhyolite or Granite matrix
igneous
Beryl (var. Heliodor or Aquamarine)
Beryllium Aluminum Cyclosilicate (Be3Al2Si6O18)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities (mostly Iron Oxides)
Mineral
Emerald
Beryl (Be₃Al₂Si₆O₁₈), specifically the green variety colored by trace amounts of chromium or vanadium.
Mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert (Common Variety, Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Conglomerate
Conglomerate rock
sedimentary
Sandstone with Iron Staining
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Chert Nodule (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint)
Silicon Dioxide (SiO2)
sedimentary
Botryoidal Chalcedony in Geode/Vug
Silicon Dioxide (SiO2)
mineral
Dalmatian Stone (Dalmatian Jasper)
Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite
igneous
Prasiolite and Quartz Crystal Cluster
Quartz (SiO2); Prasiolite is a variety of Quartz
mineral
Transit Token (RTD Denver)
Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)
not a rock or mineral (anthropogenic material)
Ferruginous Sandstone
Sandstone with iron oxide (Hematite/Limonite) cement
sedimentary
Moss Agate
Silicon Dioxide with inclusions (SiO2)
mineral
Chert (Red/Brown Variety)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Chert (Jasper/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (variations include Flint or Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Arrowhead Debitage or Spall)
Silicon Dioxide (SiO₂)
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Mineral (Variety of Quartz)
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint variety)
Silicon Dioxide (SiO2)
sedimentary