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Coesite (Coesit)

Pictures (1 Images total)

Pyrop-Coesit-Quarzit
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Pyrop-Coesit-Quarzit
Vallone di Gilba, Val Varaita, Dora-Maira-Massiv, Cuneo, Provinz; Piemont, Italien. ca. 35x35cm.
Copyright: Doc Diether; Contribution: Doc Diether
Collection: Archiv Doc Diether
Location: Italien/Piemont (Piemonte), Region/Cuneo, Provinz/Dora-Maira-Massiv/Val Varaita/Vallone di Gilba
Mineral: Coesite, Pyrope
Rock: quartzite
Image: 1413395536
Rating: 4 (votes: 2)
License: Usage for Mineralienatlas project only
Pyrop-Coesit-Quarzit

Vallone di Gilba, Val Varaita, Dora-Maira-Massiv, Cuneo, Provinz; Piemont, Italien. ca. 35x35cm.
Collection: Archiv Doc Diether
Copyright: Doc Diether
Contribution: Doc Diether 2014-10-15
Locality: Vallone di Gilba / Val Varaita / Dora-Maira-Massiv / Cuneo, Provinz / Piemont (Piemonte), Region / Italien

Collectors Summary

Color Farblos
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 7.5 - 8
Solubility +- HF
Crystal System monoklin, C2/c
Morphology Unregelmäßige bis fast rechteckige Körner bis 3 mm

Chemism

Chemical formula

SiO2

Chemical composition

Silicium, Sauerstoff

Unit weight: 60.08439 u; Number of atoms in the formula: 3

Info

Empirical formula:

SiO2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

53.26

2

66.67

15.9994300

31.9988600
Silicon

Si

46.74

1

33.33

28.0855300

28.0855300

Analysis wt%

? SiO2 : 99.00

Strunz 9th edition incl. updates

4.DA.35

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
D: Metall: Sauerstoff = 1:2 und vergleichbare
A: Mit kleinen [Kationen]: [Kieselsäure]-Familie
35:Coesit-Gruppe

Lapis Classification

IV/D.01-050

IV: OXIDE
D: Oxide mit Verhältnis Metall : Sauerstoff = 1:2 (MO2 und verwandte Verbindungen)
1: Quarz-Reihe

Classification by Hölzel

4.DB.140

4: OXIDES
D: Dioxides
B: SiO2Modifications

Dana 8th edition

75.01.04.01

75: Tektosilicate Minerals
01: Tektosilicates Tectosilicate Si Tetrahedral Frameworks SiO2 with [4] coordinated Si

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

Farblos

Streak color

weiß

Lustre

Glasglanz

max. Birefringence

0.003
Birefringence chart\! Coesite title=Birefringence chart Coesite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.595

RI value β

1.596

RI value γ / ε

1.598

Ri mean

1.596

2V angle

Biaxial (+) 60°

Optical Data Luminescence

Luminescence

keine Fluoreszenz bekannt

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

15

Space Group

C2/c

Cell parameters a (Å)

7.17

Cell parameters b (Å)

12.38

Cell parameters c (Å)

7.17

Cell parameters a/b or c/a

0.579

Cell parameters c/b

0.579

Cell parameters α

90°

Cell parameters β

120.0

Cell parameters γ

90°

Z

16

Volumne (ų)

551.175

X-Ray Powder Diffraction

3.439(70),
3.099(100),
2.772(50),
2.705(70),
2.302(50),
2.191(50),
2.038(70),
1.717(70)
XRD chart Coesite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Morphology

Unregelmäßige bis fast rechteckige Körner bis 3 mm

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

7.5 - 8

VHN (Hardness Vickers)

1650 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.92

2.896 ( ρ calc. Mineralienatlas )

Instability

+- HF

(Co-)Type locality

(Co-)Type locality

USA/Arizona/Coconino Co./Winslow/Barringer Meteoriten Krater

Preface

Associations

Stishovit, Quarz, Granat, Klinopyroxen. Kyanit, Omphacit, Sanidin, Muskovit, Rutil, Dolomit.

Rareness

lokal häufig

Author (Name, Year)

Sosman, 1954

Additional Information

Coesit ist eine Quarz-Modifikation (Polymorphie)

References

Handbook of Mineralogy (Anthony et al.), 2 (1995), 156

Other languages

German

Coesit

Spanish

Coesita

English

Coesite

French

Coesite

Russian

Коэсит

Simplified Chinese

柯石英

CNMNC symbol

Symbol

Coe

Locations with GPS information