Mineralogy Database

Coesite Mineral Data

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General Coesite Information

Help on Chemical  Formula: Chemical Formula: SiO2
Help on Composition: Composition: Molecular Weight = 60.08 gm
   Silicon  46.74 %  Si  100.00 % SiO2
   Oxygen   53.26 %  O
           ______        ______ 
           100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (SiO2)
Help on Environment: Environment: High temperature and high pressure polymorph of quartz (500-800 deg C, ~ 30-35 kbar). Formed in impact craters and ultra-high-pressure eclogite rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1954
Help on Locality: Locality: Metor Crater, Cononino County, Arizona, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Loring Coes, Jr. (1915-1973), American chemist, Norton Company, who first synthesized the phase.
Help on Synonym: Synonym: ICSD 18112
  PDF 14-654
 

Coesite Image

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  Coesite

Comments: Fine-grained, massive coesite.
Location: Meteor Crater, Canyon Diablo, Coconino County, Arizona, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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  Coesite

Comments: Coesite inclusion in garnet of eclogite sample (Eur. J. Mineral, 13:567).
Location: Ultra high-pressure metamorphic area of the Saidenbach reservoir, Erzgebirge, Germany, where micro-diamond-bearing gneiss occurs. Scale: Scale Bar 50 µm.
© Eur. J. Mineral

Coesite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5791:1:0.5791
Help on Cell Dimensions: Cell Dimensions: a = 7.17, b = 12.38, c = 7.17, Z = 16; beta = 120° V = 551.18 Den(Calc)= 2.90
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.098(1), 3.432(0.5), 2.77(0.15),
 

Physical Properties of Coesite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless.
Help on Density: Density: 2.93
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Hardness: Hardness: 7.5 - Garnet
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Coesite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.022 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2055,KPDmeas= 0.2034,KC= 0.208
Ncalc = 1.6 - 1.61
Help on Optical Data: Optical Data: Biaxial (+), a=1.593-1.594, b=1.595, g=1.599, bire=0.0050-0.0060, 2V(Calc)=54-72, 2V(Meas)=54-64. Dispersion r < v weak.
 

Calculated Properties of Coesite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.90 gm/cc
note: Specific Gravity of Coesite =2.90 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PECoesite = 1.80 barns/electron
U=PECoesite x rElectron Density= 5.20 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Coesite is Not Radioactive
 

Coesite Classification

Help on  Dana Class: Dana Class: 75.01.04.01 (75)Tectosilicate Si Tetrahedral Frameworks
  (75.01)SiO2 with [4] coordinated Si
  (75.01.04)Dana Group
 
75.01.04.01 Coesite SiO2 C 2/c 2/m
 
75.01.04.02 Moganite! SiO2 I2/a 2/m
Help on  Strunz Class: Strunz Class: 04.DA.35 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DA -With small cations
 
04.DA.35 Coesite SiO2 C 2/c 2/m
 

Other Coesite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Coesite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineral and Gemstone Kingdom
13 - Mineralienatlas (Deutsch)
14 - Minerals in Thin Section-University of North Carolina
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info
18 - WWW-MINCRYST

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Coesite

SiO2
Dana No: 75.01.04.01 Strunz No: 04.DA.35
Locality:

 

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