Paracelsian Mineral Data

Paracelsian Mineral Data +

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General Paracelsian Information

Chemical Formula:

BaAl2Si2O8

Composition:

Molecular Weight = 375.46 gm

Barium 36.58 % Ba 40.84 % BaO

Aluminum 14.37 % Al 27.16 % Al₂O₃

Silicon 14.96 % Si 32.01 % SiO₂

Oxygen 34.09 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BaAl₂Si₂O₈

IMA Status:

Valid Species (Pre-IMA) 1905

Locality:

BE Link to MinDat.org Location Data.

Synonym:

ICSD 27720

PDF 10-352

Paracelsian Image

Images:

Paracelsian

Comments: Translucent paracelsian crystals on matrix.
Location: Benalt Mine, Rhiw, Carnarvonshire, Gwynedd, Wales. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Paracelsian Crystallography

Axial Ratios:

a:b:c =0.8953:1:0.9475

Cell Dimensions:

a = 8.58, b = 9.583, c = 9.08, Z = 4; beta = 90° V = 746.58 Den(Calc)= 3.34

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 4(1), 3.8(0.7), 2.99(0.5),

Crystal Structure:

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Phillips M W , Kroll H , Pentinghaus H , Ribbe P H , American Mineralogist , 60 (1975) p.659-666, The structures of synthetic paracelsian analogs, SrGa2Si2O8 and SrGa2Ge2O8

View Additional jPOWD Structure files for Paracelsian
[1] [2] [3] [4]

Physical Properties of Paracelsian

Cleavage:

[110] Indistinct

Color:

Colorless, White.

Density:

3.31 - 3.32, Average = 3.31

Diaphaniety:

Transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Hardness:

6 - Orthoclase

Luminescence:

Fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Paracelsian

Gladstone-Dale:

CI meas= 0.001 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.008 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1736,KPDmeas= 0.1749,KC= 0.1751

Optical Data:

Biaxial (-), a=1.5702, b=1.5824, g=1.5869, bire=0.0167

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Paracelsian

Electron Density:

r_electron=3.07 gm/cc
note: r_Paracelsian=3.32 gm/cc.

Fermion Index

Fermion Index = 0.07233
Boson Index = 0.92767

Photoelectric:

PE_Paracelsian= 159.23 barns/electron
U=PE_Paracelsian x r_electron= 489.24 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Paracelsian is Not Radioactive

Paracelsian Classification

Dana Class:

76.1.5.1 (76)Tectosilicate Al-Si Framework

(76.1)with Al-Si frameworks

(76.1.5)Paracelsian group

76.1.5.1 Paracelsian BaAl2Si2O8 P 2₁/c 2/m

76.1.5.2 Slawsonite (Sr,Ca)Al2Si2O8 P 2₁/a 2/m

Strunz Class:

VIII/J.06-70 VIII - Silicates

VIII/J - Tectosilicates (network) without anions unfamiliar to the tetraheders

VIII/J.06 - Feldspar group, Buddingtonite - Orthoclase - Slawsonite series

VIII/J.06-10 Buddingtonite (NH4)AlSi3O8·0.5(H2O) P 2₁ or P 2₁/m Mono

VIII/J.06-15 Kokchetavite! KAlSi3O8 P 6/mmm(?) 6/m 2/m 2/m

VIII/J.06-20 Sanidine (K,Na)(Si,Al)4O8 C 2/m 2/m

VIII/J.06-30 Microcline KAlSi3O8 C1 1

VIII/J.06-35 Rubicline! (Rb,K)AlSi3O8 P1 1

VIII/J.06-40 Orthoclase KAlSi3O8 C 2/m 2/m

VIII/J.06-50 Hyalophane (K,Ba)Al(Si,Al)3O8 C 2/m 2/m

VIII/J.06-60 Celsian BaAl2Si2O8 I21/c 2/m

VIII/J.06-70 Paracelsian BaAl2Si2O8 P 2₁/c 2/m

VIII/J.06-80 Slawsonite (Sr,Ca)Al2Si2O8 P 2₁/a 2/m

Other Paracelsian Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Paracelsian

BaAl2Si2O8
Dana No: 76.1.5.1 Strunz No: VIII/J.06-70
Locality:

Notes: