Mineralogy Database

Sapphirine Mineral Data

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General Sapphirine Information

Help on Chemical  Formula: Chemical Formula: (Mg,Al)8(Al,Si)6O20
Help on Composition: Composition: Molecular Weight = 683.33 gm
   Magnesium  21.34 %  Mg   35.39 % MgO
   Aluminum   25.67 %  Al   48.49 % Al2O3
   Silicon     6.17 %  Si   13.19 % SiO2
   Oxygen     46.83 %  O
             ______        ______ 
             100.00 %       97.07 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg6Al6.5Si1.5O20
Help on Environment: Environment: Magmatic and metamorphic rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1819
Help on Locality: Locality: St. Urbain, Charlevoix Co., Quebec, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its blue color.
Help on Name Pronunciation: Name Pronunciation: Sapphirine + Pronunciation Say SAPPHIRINE
 

Sapphirine Image

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  Sapphirine

Comments: Large complex crystalline cluster of dark blue to black sapphirine.
Location: Betroka district, Toliara (TulÊar) Province, Madagascar. Scale: 15x14x10 mm.
© John Betts - Fine Minerals

Sapphirine Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9642:1:0.8336
Help on Cell Dimensions: Cell Dimensions: a = 9.97, b = 10.34, c = 8.62, Z = 2; alpha = 107.4°, beta = 95.2°, gamma = 123.8° V = 701.75 Den(Calc)= 3.23
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
 

Physical Properties of Sapphirine

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: Blue, Bluish gray, Greenish gray, Green.
Help on Density: Density: 3.42 - 3.48, Average = 3.45
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 7.5 - Garnet
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 Sapphirine

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.047 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.062 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.211,KPDmeas= 0.2079,KC= 0.1986
Ncalc = 1.68 - 1.69
Help on Optical Data: Optical Data: Biaxial (-), a=1.701-1.729, b=1.703-1.732, g=1.705-1.734, bire=0.0040-0.0050, 2V(Calc)=78-88, 2V(Meas)=51-69. Dispersion r < v.
Help on Pleochroism (y): Pleochroism (y): greenish blue, blue, or dark blue.
Help on Pleochroism (z): Pleochroism (z): deep blue, yellowish green, or green.
 

Calculated Properties of Sapphirine

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.41 gm/cc
note: Specific Gravity of Sapphirine =3.45 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PESapphirine = 1.47 barns/electron
U=PESapphirine x rElectron Density= 5.01 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Sapphirine is Not Radioactive
 

Sapphirine Classification

Help on  Dana Class: Dana Class: 69.02.01b.01 (69)Inosilicate Chains with Side Branches or Loops
  (69.02)with P>2
  (69.02.01b)Aenigmatite and related species (Sapphirine subgroup)
 
69.02.01b.01 Sapphirine (Mg,Al)8(Al,Si)6O20 P1 1
 
69.02.01b.02 Surinamite (Mg,Fe)3Al4BeSi3O16 P 21/n 2/m
 
69.02.01b.03 Khmaralite! (Mg,Al,Fe)16(Al,Si,Be)12O40 P 21/c 2/m
Help on  Strunz Class: Strunz Class: 09.DH.45 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DH -Inosilicates with 4-periodic single chains, Si4O12
 
09.DH.45 Aenigmatite (Na,Ca)4(Fe,Ti,Mg)12Si12O40 P1 1
 
09.DH.45 Dorrite Ca2Mg2Fe4(Al,Fe)4Si2O20 P1,P 1 Tri
 
09.DH.45 Krinovite NaMg2CrSi3O10 P1 1
 
09.DH.45 Rhonite Ca2(Mg,Fe,Fe,Ti)6(Si,Al)6O20 P1 1
 
09.DH.45 Sapphirine (Mg,Al)8(Al,Si)6O20 P1 1
 
09.DH.45 Serendibite Ca2(Mg,Al)6(Si,Al,B)6O20 P1 1
 
09.DH.45 Khmaralite! (Mg,Al,Fe)16(Al,Si,Be)12O40 P 21/c 2/m
 
09.DH.45 Makarochkinite! Ca2Fe4FeTiSi4BeAlO20 P1 1
 
09.DH.45 Welshite Ca4Mg9Sb3O4[Si6Be3AlFe2O36] P1 1
 
09.DH.45 Wilkinsonite Na2Fe4Fe2Si6O20 P1 1
 

Other Sapphirine Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Sapphirine :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

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Sapphirine

(Mg,Al)8(Al,Si)6O20
Dana No: 69.02.01b.01 Strunz No: 09.DH.45
Locality:

 

Notes:

 

 
   
 


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