Maleevite Mineral Data
General Maleevite Information
Chemical Formula:
BaB2Si2O8
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 % B2 O3
Oxygen 37.44 % O
______ ______
100.00 % 99.98 % = TOTAL OXIDE
Empirical Formula:
Ba0.99 B1.99 Si2.01 O8
Environment:
Found in a large boulder of pegmatite intruding syenite. Ba-dominant analogue of danburite; structure determined.
IMA Status:
Approved IMA 2004 (Dana # Added)
Locality:
Moraine of the Dara-i-Pioz glacier, Alai range, Tien Shan, northern Tajikistan. Link to MinDat.org Location Data.
Name Origin:
Named for Mihail Naidenovitch Maleev (1940-), Bulgarian mineralogist and expert in mineral systematics.
Synonym:
IMA2002-027
Maleevite Image
Images:
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
Axial Ratios:
a:b:c =0.9957:1:1.1054
Cell Dimensions:
a = 8.141, b = 8.176, c = 9.038, Z = 4; V = 601.58 Den(Calc)= 3.77
Crystal System:
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
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),
Physical Properties of Maleevite
Cleavage:
None
Color:
White.
Density:
3.78
Diaphaneity:
Transparent
Fracture:
Brittle - Uneven - Very brittle fracture producing uneven fragments.
Habit:
Blocky - Crystal shape tends to be equant (e.g. feldspars).
Habit:
Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Hardness:
7 - Quartz
Luster:
Vitreous - Greasy
Streak:
white
Optical Properties of Maleevite
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
Optical Data:
Biaxial (-), a=1.649, b=1.656, g=1.656, bire=0.0070
Calculated Properties of Maleevite
Electron Density:
Bulk Density (Electron Density)=3.47 gm/cc note: Specific Gravity of Maleevite =3.77 gm/cc.
Fermion Index:
Fermion Index = 0.09 Boson Index = 0.91
Photoelectric:
PEMaleevite = 173.72 barns/electronU=PEMaleevite x r Electron Density= 603.47 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Maleevite is Not Radioactive
Maleevite Classification
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
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
References:
NAME( CanMin, v 42, p 107) PHYS. PROP.(CanMin, v 42, p 107) OPTIC PROP.(CanMin, v 42, p 107)
See Also:
Links to other databases for Maleevite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
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:
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