First Natural Occurrence of Coesite

  title={First Natural Occurrence of Coesite},
  author={Edward C. T. Chao and Eugene Merle Shoemaker and Betty M. Madsen},
  pages={220 - 222}
Coesite, the high-pressure polymorph of SiO2, hitherto known only as a synthetic compound, is identified as an abundant mineral in sheared Coconino sandstone at Meteor Crater, Arizona. This natural occurrence has important bearing on the recognition of meteorite impact craters in quartz-bearing geologic formations. 
Quartz pseudomorphs after coesite
Coesite has recently been described as a primary phase in a mantle-derived kyanite eclogite from the Roberts-Victor kimberlite, South Africa. An additional specimen from the same locality contains
Coesite Discovered in Tektites
  • L. Walter
  • Geology, Materials Science
  • 1965
The mixture of SiO2 phases indicates that these tektites have been quenched from high temperatures and that modifications in texture and chemical composition from the original parent material have been minimal.
An unusual occurrence of coesite at the Lonar crater, India
Coesite has been identified within ejected blocks of shocked basalt at Lonar crater, India. This is the first report of coesite from the Lonar crater. Coesite occurs within SiO2 glass as distinct ~30
Trace Element Relationships and Terrestrial Origin of Tektites
RECENTLY, Cherry, Taylor, and Sachs1 reported from an examination of australite data “that silica concentration is significantly negatively correlated with the concentrations of aluminium oxide,
Origin of Diamonds in the Ureilites
Diamonds in two of the three diamantiferous stony meteorites (ureilites) show a pronounced crystallographic orientation. This suggests that the diamonds were produced by shock during breakup of the
Lake Mien, Southern Sweden — A Possible Astrobleme
Coesite, a high pressure polymorph of quartz, has been shown to exist in boulders coming from the Lake Mien structure. Earlier this was interpreted as of volcanic origin but the finding of coesite
Shock metamorphism of the Coconino Sandstone at Meteor Crater, Arizona
A study of the shocked Coconino sandstone from Meteor Crater, Arizona, was undertaken to examine the role of porosity in the compression of rocks and in the formation of highpressure phases. A suite
The Classification of Soil Silicates and Oxides
Soils may be developed on either sedentary or transported materials, but irrespective of which of these is involved, all soils may be traced back to parent rocks. Hence all rock-forming minerals can
Sudbury Structure, Ontario: Some Petrographic Evidence for Origin by Meteorite Impact
Unusual deformation structures, similar to those observed in rocks from known and suspected meteorite impact craters, are observed in inclusions of basement rock in the Onaping formation at Sudbury, Ontario, suggesting that the formation consists of shocked and melted material deposited immediately after a meteoriteimpact which formed the Sudbury basin.


The quartz‐coesite transition
The quartz–coesite transition curve has been determined over the temperature range 700° to 1700°C in the pressure range 20 to 40 kb. The equation for the curve is P = 19.5 + 0.0112T, where P is in
High-pressure region of the silica isotypes
The region extending from ambient conditions up to approximately 600° C and 60,000 bars has been examined for the various polymorphs of S i 0 2 , and for B e F 2 , A1P0 4 , A1AS04, A1V04 , MnAs0 4 ,
A New Dense Crystalline Silica.
  • L. Coes
  • Materials Science, Medicine
  • 1953
Geological Survey open file report
  • 1959
Meteor Crater (The author
  • 1910