Coesite (original) (raw)
A valid IMA mineral species - grandfathered
About CoesiteHide
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Colour:
Colourless, very pale pink, very pale yellowish-white
Lustre:
Vitreous, Sub-Vitreous, Waxy
Specific Gravity:
2.92 (Calculated)
Crystal System:
Monoclinic
Name:
Named in honor of Loring Coes Jr. (5 January 1915, Worcester, Massachusetts, USA - 4 December 1978, Worcester, Massachusetts, USA), chemist who first synthesized it. The name was first proposed by Sosman in 1954 for the synthetic material. The name was carried over when natural material was found.
A high-pressure modification of SiO2.
In the impact rocks, it may result from subsolidus quartz-to-coesite transformation.
An interesting coesite-like phase bearing 8.5 wt.% H2O and some Al and B is described by Thomas et al. (2022).
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:1104:0
6e8e18ec-6947-42a7-822e-6b47f143e62b
IMA Classification of CoesiteHide
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Approved, 'Grandfathered' (first described prior to 1959)
Type description reference:
Classification of CoesiteHide
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4.DA.35
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
A : With small cations: Silica family
75.1.4.1
75 : TECTOSILICATES Si Tetrahedral Frameworks
1 : Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
7.8.2
7 : Oxides and Hydroxides
8 : Oxides of Si
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Coe | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Coe | Siivolam & Schmid (2007) | Siivolam, J. and Schmid, R. (2007) Recommendations by the IUGS Subcommission on the Systematics of Metamorphic Rocks: List of mineral abbreviations. Web-version 01.02.07. IUGS Commission on the Systematics in Petrology. download |
| Coe | Whitney & Evans (2010) | Whitney, D.L. and Evans, B.W. (2010) Abbreviations for names of rock-forming minerals. American Mineralogist, 95, 185–187 doi:10.2138/am.2010.3371 |
| Coe | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of CoesiteHide
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Vitreous, Sub-Vitreous, Waxy
Transparency:
Transparent, Translucent
Colour:
Colourless, very pale pink, very pale yellowish-white
Cleavage:
Poor/Indistinct
Suspected on {010}{012}
Density:
2.92 g/cm3 (Calculated)
Optical Data of CoesiteHide
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RI values:
_n_α = 1.593 - 1.599 _n_γ = 1.597 - 1.604
δ = 0.004 - 0.005
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Pleochroism:
Non-pleochroic
Comments:
On synthetic material
Chemistry of CoesiteHide
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Common Impurities:
Al,Fe,Na
Crystallography of CoesiteHide
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Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 7.143(2) Å, b = 12.383(3) Å, c = 7.143(2) Å
β = 120°
Ratio:
a:b:c = 0.577 : 1 : 0.577
Unit Cell V:
547.16 ų (Calculated from Unit Cell)
Morphology:
Irregular to rectangular grains.
Crystal StructureHide
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0000816 | Coesite | Levien L, Prewitt C T (1981) High-pressure crystal structure and compressibility of coesite American Mineralogist 66 324-333 |  |
1981 | 0 | 293 | |
| 0000817 | Coesite | Levien L, Prewitt C T (1981) High-pressure crystal structure and compressibility of coesite American Mineralogist 66 324-333 | |
1981 | 0 | 293 | |
| 0000818 | Coesite | Levien L, Prewitt C T (1981) High-pressure crystal structure and compressibility of coesite American Mineralogist 66 324-333 | |
1981 | 2.18 | 293 | |
| 0000819 | Coesite | Levien L, Prewitt C T (1981) High-pressure crystal structure and compressibility of coesite American Mineralogist 66 324-333 | |
1981 | 3.15 | 293 | |
| 0000820 | Coesite | Levien L, Prewitt C T (1981) High-pressure crystal structure and compressibility of coesite American Mineralogist 66 324-333 | |
1981 | 3.87 | 293 | |
| 0000821 | Coesite | Levien L, Prewitt C T (1981) High-pressure crystal structure and compressibility of coesite American Mineralogist 66 324-333 | |
1981 | 4.6 | 293 | |
| 0000822 | Coesite | Levien L, Prewitt C T (1981) High-pressure crystal structure and compressibility of coesite American Mineralogist 66 324-333 | |
1981 | 5.19 | 293 | |
| 0004264 | Coesite | Ikuta D, Kawame N, Banno S, Hirajima T, Ito K, Rakovan J F, Downs R T, Tamada O (2007) First in situ X-ray diffraction identification of coesite and retrograde quartz on a glass thin section of an ultrahigh-pressure metamorphic rock and their crystal structure details American Mineralogist 92 57-63 | |
2007 | Yangkou meta-igneous complex in the middle part of the Sulu UHP terrain, eastern China | 0 | 293 |
| 0008746 | Coesite | Angel R J, Shaw C S J, Gibbs G V (2003) Compression mechanisms of coesite Physics and Chemistry of Minerals 30 167-176 | 2003 | 0.0001 | 293 | ||
| 0008747 | Coesite | Angel R J, Shaw C S J, Gibbs G V (2003) Compression mechanisms of coesite Physics and Chemistry of Minerals 30 167-176 | 2003 | 0.0001 | 293 | ||
| 0008748 | Coesite | Angel R J, Shaw C S J, Gibbs G V (2003) Compression mechanisms of coesite Physics and Chemistry of Minerals 30 167-176 | 2003 | 2.248 | 293 | ||
| 0008749 | Coesite | Angel R J, Shaw C S J, Gibbs G V (2003) Compression mechanisms of coesite Physics and Chemistry of Minerals 30 167-176 | 2003 | 2.84 | 293 | ||
| 0008750 | Coesite | Angel R J, Shaw C S J, Gibbs G V (2003) Compression mechanisms of coesite Physics and Chemistry of Minerals 30 167-176 | 2003 | 3.763 | 293 | ||
| 0008751 | Coesite | Angel R J, Shaw C S J, Gibbs G V (2003) Compression mechanisms of coesite Physics and Chemistry of Minerals 30 167-176 | 2003 | 4.45 | 293 | ||
| 0008752 | Coesite | Angel R J, Shaw C S J, Gibbs G V (2003) Compression mechanisms of coesite Physics and Chemistry of Minerals 30 167-176 | 2003 | 5.01 | 293 | ||
| 0008753 | Coesite | Angel R J, Shaw C S J, Gibbs G V (2003) Compression mechanisms of coesite Physics and Chemistry of Minerals 30 167-176 | 2003 | 6.16 | 293 | ||
| 0008754 | Coesite | Angel R J, Shaw C S J, Gibbs G V (2003) Compression mechanisms of coesite Physics and Chemistry of Minerals 30 167-176 | 2003 | 6.509 | 293 | ||
| 0008755 | Coesite | Angel R J, Shaw C S J, Gibbs G V (2003) Compression mechanisms of coesite Physics and Chemistry of Minerals 30 167-176 | 2003 | 7.814 | 293 | ||
| 0008756 | Coesite | Angel R J, Shaw C S J, Gibbs G V (2003) Compression mechanisms of coesite Physics and Chemistry of Minerals 30 167-176 | 2003 | 8.68 | 293 | ||
| 0010692 | Coesite | Araki T, Zoltai T (1969) Refinement of a coesite structure Zeitschrift fur Kristallographie 129 381-387 | |
1969 | synthetic | 0 | 293 |
| 0010809 | Coesite | Kirfe A, Will G, Arndt J (1979) A new phase of coesite SiO2 it is not really a new phase Zeitschrift fur Kristallographie 149 315-326 | |
1979 | 0 | 293 | |
| 0010855 | Coesite | Sasaki S, Chen H K, Prewitt C T, Nakajima Y (1983) Re-examination of "P2_1/a coesite" Zeitschrift fur Kristallographie 164 67-77 | |
1983 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.2 Å | (8) |
| 4.38 Å | (4) |
| 3.43 Å | (30) |
| 3.09 Å | (100) |
| 2.76 Å | (8) |
| 2.69 Å | (10) |
| 2.33 Å | (4) |
| 2.29 Å | (8) |
| 2.18 Å | (4) |
| 2.03 Å | (6) |
| 1.84 Å | (4) |
| 1.79 Å | (8) |
| 1.71 Å | (12) |
| 1.70 Å | (10) |
| 1.66 Å | (2) |
| 1.58 Å | (6) |
| 1.545 Å | (10) |
| 1.501 Å | (4) |
| 1.418 Å | (2) |
| 1.409 Å | (4) |
| 1.345 Å | (12) |
| 1.321 Å | (2) |
| 1.285 Å | (6) |
| 1.236 Å | (4) |
| 1.171 Å | (6) |
Comments:
ICDD 14-654 (synthetic)
Geological EnvironmentHide
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Geological Setting:
Formed at pressures > 20 kbar. Impact craters, kimberlites, eclogites.
Type Occurrence of CoesiteHide
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General Appearance of Type Material:
Irregular grains from 5-50 microns in size.
Place of Conservation of Type Material:
Geological Setting of Type Material:
In sandstone associated with a meteor impact crater (under and nearby).
Reference:
Chao, E.C.T., Shoemaker, E.M., Madsen, M.M. (1960) First natural occurrence of coesite. Science: 132: 220-222.
Synonyms of CoesiteHide
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Other Language Names for CoesiteHide
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Simplified Chinese:柯石英
Traditional Chinese:柯石英
Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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Fluorescence of CoesiteHide
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Other InformationHide
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Notes:
Nearly insoluble in 5% HF at room temperature. Rapidly dissolved by fused NH4HF2.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for CoesiteHide
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References for CoesiteHide
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Reference List:
Localities for CoesiteHide
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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 
symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Locality ListHide
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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 
- Good crystals or important locality for species. 
- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.