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Mullite

Pictures (87 Images total)

Mullit
Views (Image: 1276511687): 6778, Rating: 9.8
Mullit

Größe: 2,08 mm; Fundort: Wannenköpfe, Ochtendung, Eifel, Rheinland-Pfalz, Deutschland
Copyright: Matteo Chinellato
Contribution: Hg 2010-06-14
Locality: Wannenköpfe / Ochtendung / Maifeld, Verbandsgemeinde / Mayen-Koblenz-Kreis / Rheinland-Pfalz / Deutschland
Mullit
Views (Image: 1525949641): 402
Mullit (SNr: E-BB-Mullit-2-1-2)

Radialstrahliges Aggregat violetter Mullit-Nadeln, die mit Tropfen von Silikat-Glas geziert sind, aus dem Steinbruch Caspar am Bellerberg, Eifel. Bildbreite etwa 4 mm.
Collection: Klaus Schäfer
Copyright: Klaus Schäfer
Contribution: Klaus Schäfer 2018-05-10
Locality: Ettringer Bellerberg (Stbr. Caspar) / Bellerberg / Ettringen / Mayen / Mayen-Koblenz-Kreis / Rheinland-Pfalz / Deutschland
Mullit
Views (Image: 1291815223): 4401, Rating: 8.63
Mullit

Größe: 3,26 mm, Fundort: Nickenicher Sattel, Nickenich, Eifel, Rheinland-Pfalz, Deutschland
Copyright: Matteo Chinellato
Contribution: Hg 2010-12-08
Locality: Nickenicher Sattel (Eicher Sattel) / Nickenich / Pellenz, Verbandsgemeinde / Mayen-Koblenz-Kreis / Rheinland-Pfalz / Deutschland
Mullit
Views (Image: 1267274878): 7298, Rating: 9.11
Mullit

Bildbreite: 3 mm; Fundort: Emmelberg, Üdersdorf, Eifel, Rheinland-Pfalz, Deutschland
Copyright: Fred Kruijen
Contribution: Hg 2010-02-27
Locality: Emmelberg / Üdersdorf / Daun / Vulkaneifel, Landkreis / Rheinland-Pfalz / Deutschland
Mullit
Views (Image: 1263904238): 3227, Rating: 9.4
Mullit

Größe: 1,48 mm; Fundort: Ettringer Bellerberg, Ettringen, Eifel, Deutschland
Collection: Domenico Preite
Copyright: Matteo Chinellato
Contribution: Hg 2010-01-19
Locality: Ettringer Bellerberg (Stbr. Caspar) / Bellerberg / Ettringen / Mayen / Mayen-Koblenz-Kreis / Rheinland-Pfalz / Deutschland
Mullit
Views (Image: 1350943872): 850
Mullit (SNr: EM 3266)

Bildbreite: 1,9 mm; Deutschland/Rheinland-Pfalz/Vulkaneifel-Kreis/Daun/Üdersdorf/Emmelberg
Collection: loparit
Copyright: loparit
Contribution: loparit 2012-10-23
Locality: Emmelberg / Üdersdorf / Daun / Vulkaneifel, Landkreis / Rheinland-Pfalz / Deutschland

Collectors Summary

Color farblos, violett, gelb, weiß, hellrosa
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 6.5
Cleavages ausgeprägt {010}
Solubility - Säuren
Crystal System orthorhombisch, Pbam, Pbnm, Pnnm

Chemism

Chem­ical formula

Al4+2xSi2-2xO10-x {x ≈ 0.4}

Empir­ical formula (anal­y­sis)

Al4.8Si1.2O9.6

Chem­ical com­po­si­tion

Aluminium, Silicium, Sauerstoff

Unit weight: 316.80854736 u; Number of atoms in the formula: 15.6

Info

Empirical formula:

Al4.8Si1.2O9.6

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

48.48

9.6

61.54

15.9994300

153.5945280
Aluminium

Al

40.88

4.8

30.77

26.9815382

129.5113834
Silicon

Si

10.64

1.2

7.69

28.0855300

33.7026360

Anal­y­sis wt%

SiO2 : 29.04, Al2O3 : 69.63, Fe2O3 : 0.50, TiO2 : 0.79 (Ref: American Mineralogist 24)

Strunz 9th edi­tion incl. updates

9.AF.20

9: Silikate (Germanate)
A: Inselsilikate (Nesosilikate)
F: Insel(Neso)silikate mit zusätzlichem Anionen; Kationen in [4], [5] und/oder nur [6] Koordination
20:Mullit-Gruppe

Lapis Clas­sifica­tion

VIII/B.02-050

VIII: SILIKATE
B: Inselsilikate mit tetraederfremden Anionen
2: Kationen in tetraedrischer oder oktaedrischer Koordination [4/6]

Clas­sifica­tion by Hölzel

9.AG.170

9: SILICATES
A: Nesosilicates
G: Nesosilicates with Cation: O
1: C small Sillimanite-Group

Dana 8th edi­tion

52.02.02a.02

52: Nesosilicates Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
02: Nesosilicates Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O with cations in [4] and >[4] coordination
02a: Al2SiO5 (Sillimanite subgroup)

IMA sta­tus

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

farblos, violett, gelb, weiß, hellrosa

Streak color

weiß

Diaphane­ity (Trans­parency)

transparent bis durchscheinend

Lus­tre

Glasglanz

max. Birefrin­gence

0.010
Birefringence chart\! Mullite title=Birefringence chart Mullite

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

1.630 - 1.670

RI value β

1.636 - 1.675

RI value γ / ε

1.640 - 1691

Ri mean

1.657

2V angle

Biaxial (+) 20° - 61° (gemessen) 78.5 (berechnet)

Ori­enta­tion

X = a, Y = b, Z = c

Dis­per­sion

schwach, r > v

Absorp­tion

Z > X = Y

Pleochro­ism

farblos zu rosa

Optical Data Luminescence

Color LW-UV (365nm)

  

gelblich weiß

Color SW-UV (254nm)

  

gelblich weiß

After­glow (Per­sistant Lumi­nes­cence)

keine Daten

Crystallography

Crystal Sys­tem

orthorhombisch

Class (H-M)

mmm

Space Group number

58

Space Group

Pbam, Pbnm, Pnnm

Cell param­e­ters a (Å)

7.5785

Cell param­e­ters b (Å)

7.6817

Cell param­e­ters c (Å)

2.8864

Cell param­e­ters a/b or c/a

0.987

Cell param­e­ters c/b

0.376

Cell param­e­ters α

90°

Cell param­e­ters β

90°

Cell param­e­ters γ

90°

Z

1

Volumne (ų)

168.034

Kristall struc­ture

Stephan Lenz, Johannes Birkenstock, Lennart A. Fischer, Willi Schüller, Hartmut Schneider, Reinhard X. Fischer: Natural mullites: chemical composition, crystal structure, and optical properties. European Journal of Mineralogy Vol. 31, Nr. 2 (2019) S. 353-367.

X-Ray Pow­der Diffrac­tion

5.39(50),
3.428(90),
3.390(100),
2.694(40),
2.542(50),
2.206(60),
2.121(20),
1.524(30)
XRD chart Mullite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

6.5

VHN (Hard­ness Vick­ers)

960 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.2 (gemessen) 3.171 (berechnet)

3.131 ( ρ calc. Mineralienatlas )

Cleav­ages

ausgeprägt {010}

Insta­bil­ity

- Säuren

(Co-)Type locality

(Co-)Type locality

UK/Schottland/Highland/Isle of Mull/Seabank Villa

Preface

Author (Name, Year)

Bowen & Greig & Zies, 1924

References

Handbook of Mineralogy (Anthony et al.), 2 (1995), 557

Other languages

German

Mullit

Spanish

Mullita

English

Mullite

French

Mullite

Russian

Муллит

Simplified Chinese

莫来石

Alternative Name

Keramite (of Mellor and Scott)

Spanish

Porcelainita

Simplified Chinese

富铝红柱石

CNMNC symbol

Symbol

Mul

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

 DeWikiPedia - search for: Mullit
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Mineralienatlas.de (Forum) - search for: Mullit

English pages

 Mindat - search for: Mullite
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Handbook-of-Mineralogy - search for: Mullite
RRUFF - Raman, XRD and other mineral data - search for: Mullite
RRUFF - References and PDF downloads - search for: Mullite
American-Mineralogist-Crystal-Structure-Database - search for: Mullite
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Russian pages

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Mineral Dealer

German pages

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Locations with GPS information