Celsian Mineral Data

Celsian Mineral Data

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General Celsian 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:

Contact metamorphic rocks with significant barium.

IMA Status:

Valid Species (Pre-IMA) 1895

Locality:

Imfeld-Binnental, Switzerland. Link to MinDat.org Location Data.

Name Origin:

Named after the Swedish astronomer and natural scientist, A. Celsius(1701-1744).

Synonym:

ICSD 25836

PDF 38-1450

Celsian Image

Images:

Celsian Hendricksite

Comments: Gray massive celsian with dark red hendricksite.
Location: Franklin, Sussex County, New Jersey, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Celsian Crystallography

Axial Ratios:

a:b:c =0.6613:1:1.1044

Cell Dimensions:

a = 8.627, b = 13.045, c = 14.408, Z = 8; beta = 115.2° V = 1,467.15 Den(Calc)= 3.40

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: I21/c

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

By Intensity(I/I_o): 3.35(1), 3.47(1), 3.02(0.95),

Crystal Structure:

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Griffen D T , Ribbe P H , American Mineralogist , 61 (1976) p.414-418, Refinement of the crystal structure of celsian

Physical Properties of Celsian

Cleavage:

[001] Perfect, [010] Good

Color:

Colorless, Yellow, White.

Density:

3.1 - 3.4, Average = 3.25

Diaphaniety:

Transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

6-6.5 - Orthoclase-Pyrite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Celsian

Gladstone-Dale:

CI meas= -0.033 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.013 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1728,KPDmeas= 0.1808,KC= 0.1751

Optical Data:

Biaxial (+), a=1.58-1.584, b=1.585-1.587, g=1.594-1.596, bire=0.0120-0.0140, 2V(Calc)=62-74, 2V(Meas)=86-90. Dispersion none.

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Celsian

Electron Density:

r_electron=3.15 gm/cc
note: r_Celsian=3.40 gm/cc.

Fermion Index

Fermion Index = 0.07233
Boson Index = 0.92767

Photoelectric:

PE_Celsian= 159.23 barns/electron
U=PE_Celsian x r_electron= 501.79 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Celsian is Not Radioactive

Celsian Classification

Dana Class:

76.1.1.4 (76)Tectosilicate Al-Si Framework

(76.1)with Al-Si frameworks

(76.1.1)K (Na,Ba) feldspars

76.1.1.1 Orthoclase KAlSi3O8 C 2/m 2/m

76.1.1.2 Sanidine (K,Na)(Si,Al)4O8 C 2/m 2/m

76.1.1.3 Hyalophane (K,Ba)Al(Si,Al)3O8 C 2/m 2/m

76.1.1.4 Celsian BaAl2Si2O8 I21/c 2/m

76.1.1.5 Microcline KAlSi3O8 C1 1

76.1.1.6 Anorthoclase (Na,K)AlSi3O8 C1 1

76.1.1.7 Rubicline! (Rb,K)AlSi3O8 P1 1

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

Strunz Class:

VIII/J.06-60 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 Celsian Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)

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Celsian

BaAl2Si2O8
Dana No: 76.1.1.4 Strunz No: VIII/J.06-60
Locality:

Notes: