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Stishovite (Stishovit)

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Stishovit und Coesit
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Stishovit und Coesit
In diesem weißen Impaktit vom Barringer Meteoriten Krater, Coconino Co., Arizona kommen die beiden Kieselsäure-Hochdruckmodifikationen Stishovit und Coesit vor. Größe des Stückes etwa 36 mm x 15 mm.
Copyright: Klaus Schäfer; Contribution: Klaus Schäfer
Collection: Klaus Schäfer, Collection number: SyS-Stis-3-1-1
Location: USA/Arizona/Coconino Co./Winslow/Barringer Meteoriten Krater
Mineral: Coesite, Stishovite
Image: 1711811739
License: Usage for Mineralienatlas project only
Stishovit und Coesit (SNr: SyS-Stis-3-1-1)

In diesem weißen Impaktit vom Barringer Meteoriten Krater, Coconino Co., Arizona kommen die beiden Kieselsäure-Hochdruckmodifikationen Stishovit und Coesit vor. Größe des Stückes etwa 36 mm x 15 mm...
Collection: Klaus Schäfer
Copyright: Klaus Schäfer
Contribution: Klaus Schäfer 2024-03-30
Locality: Barringer Meteoriten Krater / Winslow / Coconino Co. / Arizona / USA

Collectors Summary

Color farblos
Streak color weiß
Hardness (Mohs) 7.5 - 8
Solubility + HF
Crystal System tetragonal, P42/mnm
Morphology Aggregate aus submikroskopischen Kristallen

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.15

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
15:Stishovit-Gruppe

Lapis Classification

IV/D.01-060

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

Classification by Hölzel

4.DB.160

4: OXIDES
D: Dioxides
B: SiO2Modifications

Dana 8th edition

04.04.01.09

04: Oxide Minerals
04: Simple Oxides with a cation charge of 4+ (A++++ O2)
01: Rutile group (Tetragonal: P4/mnm)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos

Streak color

weiß

Diaphaneity (Transparency)

transparent

max. Birefringence

0.027
Birefringence chart\! Stishovite title=Birefringence chart Stishovite

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

1.799s

RI value γ / ε

1.826

Ri mean

1.808

2V angle

Uniaxial (+)

Crystallography

Crystal System

tetragonal

Class (H-M)

4/mmm

Space Group number

136

Space Group

P42/mnm

Cell parameters a (Å)

4.179

Cell parameters b (Å)

-

Cell parameters c (Å)

2.665

Cell parameters a/b or c/a

0.638

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

2

Volume (ų)

46.542

X-Ray Powder Diffraction

2.959(100),
2.246(20),
1.981(30),
1.870(10),
1.530(50),
1.478(20),
1.333(10),
1.235(20)
XRD chart Stishovite

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

Morphology

Aggregate aus submikroskopischen Kristallen

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

7.5 - 8

VHN (Hardness Vickers)

1890

Density (g/cm³)

4.29 - 4.35

4.287 ( ρ calc. Mineralienatlas )

Instability

+ HF

(Co-)Type locality

(Co-)Type locality

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

Preface

Occurrences

In Meteor-Impakten, wo er durch Schock-Metamorphose aus Quarz bei Temperaturen > 1200 Grad und Drücken 100 kbar gebildet wurde. Halbstabil, altert zu Glas oder Cristobalit bei > 300 Grad.

Associations

Coesit, Quarz, Si-Glas

Rareness

selten

Author (Name, Year)

Chao & Fahey & Littler & Milton, 1962

Additional Information

Modifikation von SiO2, siehe Quarz (Polymorphie).

References

Handbook of Mineralogy (Anthony et al.), 2 (1995), 757

Wenjun Yong, Edgar Dachs, Artur Benisek, Richard A. Secco: Heat capacity, entropy and phase equilibria of stishovite. Physics and Chemistry of Minerals Volume 39, Number 2 (2012) S.153-162.

Other languages

German

Stishovit

Spanish

Stishovita

English

Stishovite

French

Stishovite

Russian

Стишовит

Alternative Name

Stipoverit

Stipoverita

Stipoverite

CNMNC symbol

Symbol

Sti

Locations with GPS information

IDs

GUSID (Global unique identifier short form) IaXqvnRgUkiqZPxKSQCkVg
GUID (Global unique identifier) BEEAA521-6074-4852-AA64-FC4A4900A456
Database ID 3647