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

Environment:

In a band through shales and sandstones, associated with a metamorphosed manganese deposit (Benallt mine, Wales).

IMA Status:

Valid Species (Pre-IMA) 1905

Locality:

From Candoglia, Valle d'Ossola, Piedmont, Italy. In the Benallt mine, Rhiw, Lleyn Peninsula, Wales. Link to MinDat.org Location Data.

Name Origin:

A combination of the Greek "para", for near, and the mineral's dimorph, celsian.

Name Pronunciation:

Paracelsian + Pronunciation

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

Diaphaneity:

Transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Pseudo Orthorhombic - Crystals show an orthorhombic shape.

Hardness:

6 - Orthoclase

Luminescence:

Non-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
Ncalc = 1.58

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:

Bulk Density (Electron Density)=3.07 gm/cc
note: Specific Gravity of Paracelsian =3.32 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

PE_Paracelsian= 159.23 barns/electron
U=PE_Paracelsian x rElectron Density= 489.24 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Paracelsian is Not Radioactive

Paracelsian Classification

Dana Class:

76.01.05.01 (76)Tectosilicate Al-Si Framework

(76.01)with Al-Si frameworks

(76.01.05)Paracelsian group

76.01.05.01 Paracelsian BaAl2Si2O8 P 2₁/c 2/m

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

Strunz Class:

09.FA.40 09 - SILICATES (Germanates)

09.F - Tektosilicates without Zeolitic H2O

09.FA -Tektosilicates without additional non-tetrahedral anions, (Al,B):Si = 1:1

09.FA.40 Paracelsian BaAl2Si2O8 P 2₁/c 2/m

Other Paracelsian Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Paracelsian :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Paracelsian

BaAl2Si2O8
Dana No: 76.01.05.01 Strunz No: 09.FA.40
Locality:

Notes: