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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 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

Volumne (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


 
 
 
 
 

 
 
 
(Na,K)AlSi3O8
triklin
C1

 
 
 
(NH4)AlSi3O8·0.5 H2O
monoklin
P21, P21/m

 
 
 
BaAl2Si2O8
monoklin
I2/c

 
 
 
(K,Ba)Al(Si,Al)3O8
monoklin
C2/m

 
 
 
KAlSi3O8
triklin
C1

 
 
 
KAlSi3O8
monoklin
C2/m

 
 
 
(Rb,K)[AlSi3O8]
triklin
P1

 
 
 
(K,Na)(Si,Al)4O8
monoklin
C2/m

 
 
BaNa2Al4Si4O16
orthorhombisch
Iba2

 
 
CaAl2Si2O8
hexagonal
P6/mmm

 
 
K[(Al,Zn)2(As,Si)2O8]
monoklin
I2/c

 
 
KAlSi3O8
hexagonal
P6/mmm

 
 
(Na,Ca)AlSi3O8
tetragonal
I4/m

 
 
BaAl2Si2O8
monoklin
P21/a

 
 
 
 
 

 
 
 
NaAlSi3O8
triklin
C1

 
 
 
(Na,Ca)(Si,Al)4O8
triklin
P1

 
 
 
CaAl2Si2O8
triklin
P1

 
 
 
(Ca,Na)(Si,Al)4O8
triklin
I1

 
 
 
(Ca,Na)(Si,Al)4O8
triklin
C1

 
 
 
(Na,Ca)(Si,Al)4O8
triklin
C1

 
 
NaBSi3O8
triklin
C1

 
 
(Sr,Ca)Al2Si2O8
monoklin
P21/a

 
 
SrNa2Al4Si4O16
orthorhombisch
Iba2

 
 
CaAl2Si2O8
orthorhombisch
P21212

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Actuality: 26. Jun 2022 - 01:18:16

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