Paracelsian Mineral Data

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Search for Paracelsian using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Paracelsian :

A Bijoux Google Search for Paracelsian
Adam's Minerals Google Search for Paracelsian
Cape Minerals Google Search for Paracelsian
Dakota Matrix Minerals Google Search for Paracelsian
Excalibur Mineral Corp. Google Search for Paracelsian
Exceptional Minerals Google Search for Paracelsian
John Betts Fine Minerals Search for Paracelsian
McDougall Minerals Google Search for Paracelsian
Mineral News Website Link
Rock and Mineral Shows Google Search for Paracelsian
Weinrich Minerals, Inc. Google Search for Paracelsian

Ask about Paracelsian here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Paracelsian Specimen Label here :

Paracelsian

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

Notes: