Celsian Mineral Data

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: Images:

Celsian   Alforsite   Titantaramellite   Sanbornite Comments: SEM image showing alforsite (al). Matrix composed by lamellar sanbornite (sa) and granular quartz (q). Rectangular crystal in the upper right corner is titantaramellite (ti) and isometric crystals included in sanbornite are celsian (ce). Location: Trumbull Peak, near Incline, Mariposa Co., California, USA. Scale: See Image. © Pavel M. Kartashov

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 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 Diaphaneity: 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
Ncalc = 1.54 - 1.6 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: Bulk Density (Electron Density)=3.15 gm/cc
note: Specific Gravity of Celsian =3.40 gm/cc.
Fermion Index: Fermion Index = 0.07
Boson Index = 0.93 Photoelectric: PE_Celsian = 159.23 barns/electron
U=PE_Celsian x rElectron Density= 501.79 barns/cc.
Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Celsian is Not Radioactive  

Celsian Classification

Dana Class: 76.01.01.04 (76)Tectosilicate Al-Si Framework   (76.01)with Al-Si frameworks   (76.01.01)K (Na,Ba) feldspars  

76.01.01.01 Orthoclase KAlSi3O8 C 2/m 2/m

 

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

 

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

 

76.01.01.04 Celsian BaAl2Si2O8 I21/c 2/m

 

76.01.01.05 Microcline KAlSi3O8 C1 1

 

76.01.01.06 Anorthoclase (Na,K)AlSi3O8 C1 1

 

76.01.01.07 Rubicline! (Rb,K)AlSi3O8 P1 1

 

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

Strunz Class: 09.FA.30 09 - SILICATES (Germanates)   09.F - Tektosilicates without Zeolitic H2O   09.FA -Tektosilicates without additional non-tetrahedral anions, (Al,B):Si = 1:1  

09.FA.30 Buddingtonite (NH4)AlSi3O8•0.5(H2O) P 2₁ or P 2₁/m Mono

 

09.FA.30 Celsian BaAl2Si2O8 I21/c 2/m

 

09.FA.30 Anorthoclase (Na,K)AlSi3O8 C1 1

 

09.FA.30 Hyalophane (K,Ba)Al(Si,Al)3O8 C 2/m 2/m

 

09.FA.30 Orthoclase KAlSi3O8 C 2/m 2/m

 

09.FA.30 Microcline KAlSi3O8 C1 1

 

09.FA.30 Rubicline! (Rb,K)AlSi3O8 P1 1

 

09.FA.30 Sanidine (K,Na)(Si,Al)4O8 C 2/m 2/m

 

Other Celsian Information

References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65) See Also: Links to other databases for Celsian :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineral and Gemstone Kingdom
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST
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