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Paracelsian

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Formula:
Ba(Al2Si2O8)
Colour:
Colourless to white, light yellow tint.
Lustre:
Vitreous
Hardness:
6
Crystal System:
Monoclinic
Member of:
Name:
From the Greek for "near" and "Celsian" in allusion to its relationship to that species.
Polymorph of:
Feldspar Group. The pseudo-orthorhombic (the monoclinic angle is 90.01°) dimorph of Celsian.


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Classification of ParacelsianHide

Approved, 'Grandfathered' (first described prior to 1959)
9.FA.40

9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
A : Tektosilicates without additional non-tetrahedral anions
76.1.5.1

76 : TECTOSILICATES Al-Si Framework
1 : Al-Si Framework with Al-Si frameworks
16.12.5

16 : Silicates Containing Aluminum and other Metals
12 : Aluminosilicates of Sr, Ba and Zn

Pronounciation of ParacelsianHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of ParacelsianHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Colourless to white, light yellow tint.
Hardness:
Cleavage:
Poor/Indistinct
Poor cleavage {110} (unusual for feldspars).
Fracture:
Sub-Conchoidal

Optical Data of ParacelsianHide

Type:
Biaxial (-)
RI values:
nα = 1.570 nβ = 1.582 nγ = 1.587
Max Birefringence:
δ = 0.017
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v

Chemical Properties of ParacelsianHide

Formula:
Ba(Al2Si2O8)
IMA Formula:
BaAl2Si2O8
Common Impurities:
Fe,Mg,Ca,Na,K,H2O

Crystallography of ParacelsianHide

Crystal System:
Monoclinic
Cell Parameters:
a = 9.07 Å, b = 9.58 Å, c = 8.57 Å
β = 90.01°
Ratio:
a:b:c = 0.947 : 1 : 0.895
Unit Cell V:
744.65 ų (Calculated from Unit Cell)
Morphology:
Crystals prismatic, with {110} and {120} dominant, and with chisel-shaped terminations formed by {201}.
Twinning:
Twinning on {100}, simple; on {201}, lamellar.
Comment:
Pseudo-orthorhombic.

Type Occurrence of ParacelsianHide

Other Language Names for ParacelsianHide

Relationship of Paracelsian to other SpeciesHide

Member of:
Other Members of this group:
AlbiteNa(AlSi3O8)Tric. 1
AmazoniteK(AlSi3O8)
Andesine(Na,Ca)[Al(Si,Al)Si2O8]Tric.
AnorthiteCa(Al2Si2O8)Tric. 1 : P1
Anorthoclase(Na,K)AlSi3O8Tric.
BanalsiteNa2BaAl4Si4O16Orth.
Buddingtonite(NH4)(AlSi3)O8Mon. 2 : P21
Bytownite(Ca,Na)[Al(Al,Si)Si2O8]Tric.
CelsianBa(Al2Si2O8)Mon. 2/m
DmisteinbergiteCa(Al2Si2O8)Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
FilatoviteK(Al,Zn)2(As,Si)2O8Mon. 2/m
HexacelsianBaAl2Si2O8Hex. 6/mmm (6/m 2/m 2/m) : P63/mcm
Hyalophane(K,Ba)[Al(Si,Al)Si2O8]Mon.
KokchetaviteK(AlSi3O8)Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
KumdykoliteNa(AlSi3O8)Orth. mmm (2/m 2/m 2/m) : Pnnm
Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
MicroclineK(AlSi3O8)Tric. 1
Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
OrthoclaseK(AlSi3O8)Mon. 2/m : B2/m
ReedmergneriteNaBSi3O8Tric.
RubiclineRb(AlSi3O8)Tric.
SanidineK(AlSi3O8)Mon. 2/m : B2/m
SlawsoniteSr(Al2Si2O8)Mon.
StronalsiteNa2SrAl4Si4O16Orth.
SunstoneA variety of feldspar (microcline or oligoclase) that has schiller, commonly with an orange/brown ...
SvyatoslaviteCa(Al2Si2O8)Orth.

Related Minerals - Nickel-Strunz GroupingHide

9.FA.05KaliophiliteKAlSiO4Hex.
9.FA.05KalsiliteKAlSiO4Hex. 6 2 2 : P63 2 2
9.FA.05Nepheline(Na,K)AlSiO4Hex. 6 : P63
9.FA.05Panunzite(K,Na)AlSiO4Hex. 6 : P63
9.FA.05Trikalsilite(K,Na)AlSiO4Hex.
9.FA.05Yoshiokaite(Ca,Na)[Al(Al,Si)O4]Trig. 3 : P3
9.FA.05MegakalsiliteKAlSiO4Hex.
9.FA.10MalinkoiteNaBSiO4Hex. 6 : P63
9.FA.15VirgiliteLiAlSi2O6Hex. 6 2 2 : P62 2 2
9.FA.25LisitsyniteKBSi2O6Orth. 2 2 2 : P2 2 2
9.FA.30AdulariaKAlSi3O8Mon.
9.FA.30Anorthoclase(Na,K)AlSi3O8Tric.
9.FA.30Buddingtonite(NH4)(AlSi3)O8Mon. 2 : P21
9.FA.30CelsianBa(Al2Si2O8)Mon. 2/m
9.FA.30Hyalophane(K,Ba)[Al(Si,Al)Si2O8]Mon.
9.FA.30MicroclineK(AlSi3O8)Tric. 1
9.FA.30OrthoclaseK(AlSi3O8)Mon. 2/m : B2/m
9.FA.30SanidineK(AlSi3O8)Mon. 2/m : B2/m
9.FA.30RubiclineRb(AlSi3O8)Tric.
9.FA.30MonalbiteNaAlSi3O8Mon. 2/m : B2/m
9.FA.35AlbiteNa(AlSi3O8)Tric. 1
9.FA.35Andesine(Na,Ca)[Al(Si,Al)Si2O8]Tric.
9.FA.35AnorthiteCa(Al2Si2O8)Tric. 1 : P1
9.FA.35Bytownite(Ca,Na)[Al(Al,Si)Si2O8]Tric.
9.FA.35Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
9.FA.35Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
9.FA.35ReedmergneriteNaBSi3O8Tric.
9.FA.45SvyatoslaviteCa(Al2Si2O8)Orth.
9.FA.45KumdykoliteNa(AlSi3O8)Orth. mmm (2/m 2/m 2/m) : Pnnm
9.FA.50SlawsoniteSr(Al2Si2O8)Mon.
9.FA.55LisetiteCaNa2Al4Si4O16Orth.
9.FA.60BanalsiteNa2BaAl4Si4O16Orth.
9.FA.60StronalsiteNa2SrAl4Si4O16Orth.
9.FA.65DanburiteCaB2Si2O8Orth. mmm (2/m 2/m 2/m)
9.FA.65MaleeviteBaB2Si2O8Orth. mmm (2/m 2/m 2/m) : Pnma
9.FA.65PekoviteSrB2Si2O8
9.FA.70Lingunite(Na,Ca)AlSi3O8Tet. 4/m : I4/m
9.FA.75KokchetaviteK(AlSi3O8)Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm

Related Minerals - Dana Grouping (8th Ed.)Hide

76.1.5.2SlawsoniteSr(Al2Si2O8)Mon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

16.12.1StronalsiteNa2SrAl4Si4O16Orth.
16.12.2SlawsoniteSr(Al2Si2O8)Mon.
16.12.3BrewsteriteMon.
16.12.4CelsianBa(Al2Si2O8)Mon. 2/m
16.12.6CymriteBaAl2Si2(O,OH)8 · H2OMon.
16.12.7EdingtoniteBa[Al2Si3O10] · 4H2O
16.12.8BanalsiteNa2BaAl4Si4O16Orth.
16.12.9Harmotome(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2OMon. 2/m : P21/m
16.12.10Hyalophane(K,Ba)[Al(Si,Al)Si2O8]Mon.
16.12.11BalipholiteBaLiMg2Al3(Si2O6)2(OH)4Orth.
16.12.12ArmeniteBaCa2Al6Si9O30 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnna
16.12.13Wellsite(Ba,Ca,K2)Al2Si6O16 · 6H2OMon.
16.12.14Merlinoite(K,Na)5(Ca,Ba)2Al9Si23O64 · 23H2OOrth.
16.12.15Anandite(Ba,K)(Fe2+,Mg)3((Si,Al,Fe)4O10)(S,OH)2Mon. 2/m : B2/b
16.12.16Fraipontite(Zn,Al)3((Si,Al)2O5)(OH)4Mon.
16.12.17SauconiteNa0.3Zn3((Si,Al)4O10)(OH)2 · 4H2OMon.
16.12.18Minehillite(K,Na)2-3Ca28Zn4Al4Si40O112(OH)16Hex.
16.12.19HendricksiteK(Zn,Mg,Mn2+)3(AlSi3O10)(OH)2Mon. 2/m : B2/m
16.12.20Baileychlore(Zn,Fe2+,Al,Mg)6(Si,Al)4O10(OH)8Tric.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for ParacelsianHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Tacconi, E. (1905) Di un silicato di alluminio e bario [paracelsian] dei calcefiri di Candoglia in valle del Toce. Rend. R. Istit. Lombardo Sci. Lett., Milano, 38, 636-643 (in Italian).
Mineralogical Magazine (1907): 14: 406 (abstract).
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 (1985) Two independent refinements of the structure of paracelsian, BaAl2Si2O8: American Mineralogist: 70: 969-974.

Internet Links for ParacelsianHide

Localities for ParacelsianHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Italy (TL)
 
  • Piedmont
    • Verbano-Cusio-Ossola Province
      • Ossola Valley
        • Mergozzo
          • Candoglia
Tacconi, E. (1905): Di un silicato di alluminio e bario dei calcefiri di Candoglia in valle del Toce. Rendiconti del Regio Istituto Lombardo di Scienze e Lettere, Serie II, 38, 636-643.
Romania
 
  • Suceava Co.
    • Suceava district
      • Iacobeni (Jakobeny; Jacobeny; Jakabfalva)
http://minerals-of-the-carpathians.eu
UK
 
  • Wales
    • Gwynedd
      • Lleyn Peninsula
        • Llanfaelrhys
          • Rhiw
Spencer, L.J. (1942) Barium feldspars, (celsian and paracelsian) from Wales. Mineralogical Magazine, 26, 231-245.
Mineral and/or Locality  
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