Mineralogy Database

Stellerite Mineral Data

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General Stellerite Information

Help on Chemical  Formula: Chemical Formula: CaAl2Si7O18•7(H2O)
Help on Composition: Composition: Molecular Weight = 704.74 gm
   Calcium    5.69 %  Ca    7.96 % CaO
   Aluminum   7.66 %  Al   14.47 % Al2O3
   Silicon   27.90 %  Si   59.68 % SiO2
   Hydrogen   2.00 %  H    17.89 % H2O
   Oxygen    56.76 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaAl2Si7O18•7(H2O)
Help on Environment: Environment: Found in diabase-tuff from the Komandor islands, Bering Sea and other diabase rocks world wide.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1909
Help on Locality: Locality: Copper Isand, Commander Islands, Bering Sea. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Georg Wilhelm Steller (1709-1746), German explorer, zoologist and the discoverer of the Komandor Islands.
Help on Name Pronunciation: Name Pronunciation: Stellerite + Pronunciation Say STELLERITE
Help on Synonym: Synonym: ICSD 4395
  PDF 25-124
 

Stellerite Image

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  Stellerite

Comments: Hemispherical crystal cluster 35 mm diameter of white stellerite crystals in a pocket lined with drusy quartz.
Location: Pune (Poonah), Maharashtra, India. Scale: 13x7x5 cm.
© John Betts - Fine Minerals

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  Stellerite

Comments: Orange, blocky crystalline stellerite aggregate.
Location: Tambar Springs, New South Wales, Australia. Scale: Picture size 6x4 cm.
© Dave Barthelmy

Stellerite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7462:1:0.9704
Help on Cell Dimensions: Cell Dimensions: a = 13.599, b = 18.222, c = 17.683, Z = 8; V = 4,381.86 Den(Calc)= 2.14
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: F mmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.03(1), 4.04(0.45), 3.03(0.25),
 

Physical Properties of Stellerite

Help on Cleavage: Cleavage: {010} Perfect, {100} Imperfect, {001} Imperfect
Help on Color: Color: White, Pink, Salmon orange, Brown, Red.
Help on Density: Density: 2.12 - 2.13, Average = 2.12
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Habit: Habit: Stellate - Occurs as spherical, radial aggregates radiating from a "star" like point.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white
 

Optical Properties of Stellerite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2296,KPDmeas= 0.2312,KC= 0.2316
Ncalc = 1.49 - 1.5
Help on Optical Data: Optical Data: Biaxial (-), a=1.4848, b=1.4864-1.4964, g=1.4979, bire=0.0131
 

Calculated Properties of Stellerite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.16 gm/cc
note: Specific Gravity of Stellerite =2.13 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEStellerite = 2.02 barns/electron
U=PEStellerite x rElectron Density= 4.37 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Stellerite is Not Radioactive
 

Stellerite Classification

Help on  Dana Class: Dana Class: 77.01.04.04 (77)Tectosilicate Zeolite group
  (77.01)true zeolites
  (77.01.04)Heulandite and related species
 
77.01.04.01 Heulandite-Ca (Ca,Na)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, Cm, C 2 Mono
 
77.01.04.01a Heulandite-Na! (Na,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, Cm, C 2 Mono
 
77.01.04.01b Heulandite-K! (K,Na,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, Cm, C 2 2/m
 
77.01.04.01c Heulandite-Sr! (Sr,Na,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, Cm, C 2 Mono
 
77.01.04.01d Heulandite-Ba! (Ba,Ca,K,Na,Sr)5Al9Si27O72•22(H2O) C 2/m 2/m
 
77.01.04.02 Clinoptilolite-K (Na,K,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, C 2, Cm Mono
 
77.01.04.02a Clinoptilolite-Na! (Na,K,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, C 2, Cm Mono
 
77.01.04.02b Clinoptilolite-Ca! (Ca,Na,K)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m 2/m
 
77.01.04.03 Stilbite-Ca NaCa4[Al8Si28O72]•n(H2O)(n=28-32) C 2/m 2/m
 
77.01.04.03a Stilbite-Na! Na3Ca3[Al8Si28O72]•n(H2O)(n=28-32) C 2/m 2/m
 
77.01.04.04 Stellerite CaAl2Si7O18•7(H2O) F mmm 2/m 2/m 2/m
 
77.01.04.05 Barrerite (Na,K,Ca)2Al2Si7O18•6(H2O) Amma or Ammm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.GE.15 09 - SILICATES (Germanates)
  09.G - Tektosilicates with Zeolitic H2O
  09.GE -Chains of T10O20 Tetrahedra
 
09.GE.15 Barrerite (Na,K,Ca)2Al2Si7O18•6(H2O) Amma or Ammm 2/m 2/m 2/m
 
09.GE.15 Stellerite CaAl2Si7O18•7(H2O) F mmm 2/m 2/m 2/m
 

Other Stellerite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Stellerite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Stellerite

CaAl2Si7O18•7(H2O)
Dana No: 77.01.04.04 Strunz No: 09.GE.15
Locality:

 

Notes:

 

 
   
 


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