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Paracelsian

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Paracelsian
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Paracelsian
freistehende Kristalle bis 1,5 cm; Fundort: Benallt Mine, Rhiw, Llanfaelrhys, Halbinsel Lleyn, Caernarvornshire, Wales, England;
Ex coll. BMNH, London
Copyright: Rob Lavinsky; Contribution: Collector
Location: UK/Wales/Conwy (Gwynedd; Caernarvonshire)/Lleyn, Halbinsel/Llanfaelrhys/Rhiw/Benallt Mine
Mineral: Paracelsian
Image: 1156565327
Rating: 8 (votes: 1)
License: Usage for Mineralienatlas project only
Paracelsian

freistehende Kristalle bis 1,5 cm; Fundort: Benallt Mine, Rhiw, Llanfaelrhys, Halbinsel Lleyn, Caernarvornshire, Wales, England;
Ex coll. BMNH, London

Copyright: Rob Lavinsky
Contribution: Collector 2006-08-26
Locality: Benallt Mine / Rhiw / Llanfaelrhys / Lleyn, Halbinsel / Conwy (Gwynedd; Caernarvonshire) / Wales / UK

Collectors Summary

Color farblos
Hardness (Mohs) 6
Crystal System monoklin, P21/a

Chemism

Chemical formula

BaAl2Si2O8

Chemical composition

Aluminium, Barium, Silicium, Sauerstoff

Unit weight: 375.4572764 u; Number of atoms in the formula: 13

Info

Empirical formula:

BaAl2Si2O8

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

34.09

8

61.54

15.9994300

127.9954400

Aluminium

Al

14.37

2

15.38

26.9815382

53.9630764

Silicon

Si

14.96

2

15.38

28.0855300

56.1710600

Barium

Ba

36.58

1

7.69

137.3277000

137.3277000

Analysis wt%

SiO2 : 33.01, Al2O3 : 27.16, BaO : 38.53, K2O : 0.54 (Ref: Mineralogical Magazine 42)

Strunz 9th edition incl. updates

9.FA.40

9: Silikate (Germanate)
F: Gerüstsilikate (Tektosilikate) ohne zeolithisches H2O
A: Gerüstsilikate (Tektosilicates) ohne weitere [Anionen]
40:Paracelsian-Gruppe

Lapis Classification

VIII/J.06-070

VIII: SILIKATE
J: Gerüstsilikate (mit Zeolithen)
6: Ohne tetraederfremde Anionen; Feldspat-Gruppe

Classification by Hölzel

9.FC.210

9: SILICATES
F: Tektosilicates
C: Feldspar-Group

Dana 8th edition

76.01.05.01

76: Tektosilicates Tectosilicate Al-Si Framework
01: Tektosilicates Tectosilicate Al-Si Framework with Al-Si frameworks
05: Paracelsian group

IMA status

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

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Feldspar group

Optical Properties

Color

farblos

max. Birefringence

0.017

Birefringence chart\! Paracelsian title=Birefringence chart Paracelsian

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

1.570

RI value β

1.582

RI value γ / ε

1.587

Ri mean

1.580

2V angle

Biaxial (-) 51°

Optical Data Luminescence

Luminescence

fluoreszierend

Color SW-UV (254nm)

 

rot

Color SW-UV Afterglow (254nm)

 

rot

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/a

Cell parameters a (Å)

9.076

Cell parameters b (Å)

9.583

Cell parameters c (Å)

8.578

Cell parameters a/b or c/a

0.947

Cell parameters c/b

0.895

Cell parameters α

90°

Cell parameters β

90°..

Cell parameters γ

90°

Z

4

Volume (ų)

746.074

X-Ray Powder Diffraction

4.004(100),
3.797(70),
3.593(40),
2.990(50),
2.731(50),
2.555(50),
2.370(40),
2.194(40)

XRD chart Paracelsian

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

VHN (Hardness Vickers)

730 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.31 - 3.32 / Durchschnittlich = 3.31

3.342 ( ρ calc. Mineralienatlas )

Preface

Associations

Celsian

Rareness

Extrem Selten

Author (Name, Year)

Tacconi, 1905

Additional Information

Feldspat-Gruppe (Buddingtonit-Orthoklas-Slawsonit-Serie)

References

Handbook of Mineralogy (Anthony et al.), 2 (1995), 618

Tacconi, E. - Di un silicato di alluminio e bario paracelsian dei calcefiri di Candoglia in valle del Toce. Rend. R. Istit. Lombardo Sci. Lett., Milano, 38 (1905), 636-643 (in Italienisch).

Mineralogical Magazine (1907), 14, 406 (Abstrakt).

Spencer, L.J. (1942) Barium feldspars, (celsian and paracelsian) from Wales. Mineralogical Magazine, 26, 231-245.

Smith, J.V. (1953) The crystal structure of paracelsian, BaAl2Si2O8: Acta Crystalographica, 6, 613-620.

Deer, W.A., R.A. Howie, and J. Zussman (1963) Rock-forming Minerals, vol. 4, Framework Silicates, 166-178.

Chiari, G., G. Gazzoni, J.R. Craig, G.V. Gibbs, and S.J. Louisnathan - Two independent refinements of the structure of paracelsian, BaAl2Si2O8: American Mineralogist, 70 (1985), 969-974.

IMA group assignments

Other languages

English

Paracelsian

French

Paracelsian

German

Paracelsian

Spanish

Paracelsiana

Russian

Парацельзиан

CNMNC symbol

Symbol

Pcls

Locations with GPS information

IDs

GUSID (Global unique identifier short form) B_P2iAH2HEqMdX8xZ8rv5Q
GUID (Global unique identifier) 88F6F307-F601-4A1C-8C75-7F3167CAEFE5
Database ID 2910