Maleevite Mineral Data

Maleevite Mineral Data
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General Maleevite Information

Help on Chemical Formula: Chemical Formula: BaB2Si2O8
Help on Composition: Composition: Molecular Weight = 341.91 gm
   Barium   39.76 %  Ba   44.40 % BaO
   Silicon  16.51 %  Si   35.32 % SiO2
   Boron     6.29 %  B    20.26 % B2O3
   Oxygen   37.44 %  O
           ______        ______ 
           100.00 %       99.98 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ba0.99B1.99Si2.01O8
Help on Environment: Environment: Found in a large boulder of pegmatite intruding syenite. Ba-dominant analogue of danburite; structure determined.
Help on IMA Status: IMA Status: Approved IMA 2004 (Dana # Added)
Help on Locality: Locality: Moraine of the Dara-i-Pioz glacier, Alai range, Tien Shan, northern Tajikistan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Mihail Naidenovitch Maleev (1940-), Bulgarian mineralogist and expert in mineral systematics.
Help on Synonym: Synonym: IMA2002-027
 

Maleevite Image

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Maleevite

Comments: Backscatter elecron images of (a) an intergrowth of maleevite (Mal) and quartz (Qtz) and unknown Y-silicate (Y-Si); (b) maleevite (Mal) in arfvedsonite and astrophyllite (Astr) (CanMin, v 42, p 109).
Location: Moraine of the Dara-i-Pioz glacier, Alai range, Tien Shan, northern Tajikistan. Scale: See Image.
© Canadian Mineralogist

Maleevite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.9957:1:1.1054
Help on Cell Dimensions: Cell Dimensions: a = 8.141, b = 8.176, c = 9.038, Z = 4; V = 601.58 Den(Calc)= 3.77
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P nma
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.62(1)(210), 2.021(0.7)(033), 3.39(0.6)(121),6.07(0.6)(011), 2.83(0.5)(013), 2.481(0.4)(131), 4.86(0.3)(111),
Click Here for Large Maleevite Structure Window Crystal Structure:

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Pautov L A , Agakhanov A A , Sokolova E V , Hawthorne F C , The Canadian Mineralogist , 42 (2004) p.107-119, Maleevite, BaB2Si2O8, and pekovite, SrB2Si2O8, new mineral species from the, Dara-i-Pioz alkaline massif, Northern Tajikistan: Description and crystal structure, Locality: Dara-i-Pioz alkaline massif, Northern Tajikistan

 

Physical Properties of Maleevite

Help on Cleavage: Cleavage: None
Help on Color: Color: White.
Help on Density: Density: 3.78
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Blocky - Crystal shape tends to be equant (e.g. feldspars).
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Hardness: Hardness: 7 - Quartz
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: white
 

Optical Properties of Maleevite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1734,KPDmeas= 0.1729,KC= 0.1739
Ncalc = 1.66
Help on Optical Data: Optical Data: Biaxial (-), a=1.649, b=1.656, g=1.656, bire=0.0070
 

Calculated Properties of Maleevite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.47 gm/cc
note: Specific Gravity of Maleevite =3.77 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.09
Boson Index = 0.91
Help on Photoelectric: Photoelectric: PEMaleevite = 173.72 barns/electron
U=PEMaleevite x rElectron Density= 603.47 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Maleevite is Not Radioactive
 

Maleevite Classification
Help on Dana Class: Dana Class: 56.03.01.02 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.03)with [Si2O7] with borate groups
  (56.03.01)Danburite Goup
 
56.03.01.01 Danburite CaB2(SiO4)2 Pnam 2/m 2/m 2/m
 
56.03.01.02 Maleevite! BaB2Si2O8 P nma 2/m 2/m 2/m
 
56.03.01.03 Pekovite! SrB2Si2O8 P nma 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: 09.FA.65 09 - SILICATES (Germanates)
  09.F - Tektosilicates without Zeolitic H2O
  09.FA -Tektosilicates without additional non-tetrahedral anions, (Al,B):Si = 1:1
 
09.FA.65 Danburite CaB2(SiO4)2 Pnam 2/m 2/m 2/m
 
09.FA.65 Maleevite! BaB2Si2O8 P nma 2/m 2/m 2/m
 
09.FA.65 Pekovite! SrB2Si2O8 P nma 2/m 2/m 2/m
 

Other Maleevite Information
Help on References: References: NAME( CanMin, v 42, p 107) PHYS. PROP.(CanMin, v 42, p 107) OPTIC PROP.(CanMin, v 42, p 107)
Help on See Also: See Also: Links to other databases for Maleevite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info

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Maleevite

BaB2Si2O8
Dana No: 56.03.01.02 Strunz No: 09.FA.65
Locality:

 

Notes: