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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, County Borough/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, County Borough / 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 )

(Co-)Type locality

(Co-)Type locality

Italien/Piemont (Piemonte), Region/Verbano-Cusio-Ossola, Provinz/Mergozzo/Candoglia

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

 
Feldspar group
 
 
 

 
 
Alkali feldspar
 
 
 

 
 
 
Anorthoclase ?
(Na,K)AlSi3O8
triklin
C1

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

 
 
 
Celsian
BaAl2Si2O8
monoklin
I2/c

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

 
 
 
Microcline
KAlSi3O8
triklin
C1

 
 
 
Orthoclase
KAlSi3O8
monoklin
C2/m

 
 
 
Rubicline
(Rb,K)[AlSi3O8]
triklin
P1

 
 
 
Sanidine
(K,Na)(Si,Al)4O8
monoklin
C2/m

 
 
Banalsite
BaNa2Al4Si4O16
orthorhombisch
Iba2

 
 
Dmisteinbergite
CaAl2Si2O8
hexagonal
P6/mmm

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

 
 
Kokchetavite
KAlSi3O8
hexagonal
P6/mmm

 
 
Lingunite
(Na,Ca)AlSi3O8
tetragonal
I4/m

 
 
Paracelsian
BaAl2Si2O8
monoklin
P21/a

 
 
Plagioclase
 
 
 

 
 
 
Albite
NaAlSi3O8
triklin
C1

 
 
 
Andesine
(Na,Ca)(Si,Al)4O8
triklin
P1

 
 
 
Anorthite
CaAl2Si2O8
triklin
P1

 
 
 
Bytownite
(Ca,Na)(Si,Al)4O8
triklin
I1

 
 
 
Labradorite
(Ca,Na)(Si,Al)4O8
triklin
C1

 
 
 
Oligoclase
(Na,Ca)(Si,Al)4O8
triklin
C1

 
 
Reedmergnerite
NaBSi3O8
triklin
C1

 
 
Slawsonite
(Sr,Ca)Al2Si2O8
monoklin
P21/a

 
 
Stronalsite
SrNa2Al4Si4O16
orthorhombisch
Iba2

 
 
Svyatoslavite
CaAl2Si2O8
orthorhombisch
P21212

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Actuality: 07. Dec 2024 - 03:39:23

Other languages

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Paracelsian

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Paracelsian

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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