Maleevite Mineral Data

Maleevite Mineral Data

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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 % B₂O₃

Oxygen 37.44 % O

______ ______

100.00 % 99.98 % = TOTAL OXIDE

Empirical Formula:

Ba_0.99B_1.99Si_2.01O₈

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 - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P nma

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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),

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

Cleavage:

None

Color:

White.

Density:

3.78

Diaphaniety:

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

Optical Data:

Biaxial (-), a=1.649, b=1.656, g=1.656, bire=0.0070

Calculated Properties of Maleevite

Electron Density:

r_electron=3.47 gm/cc
note: r_Maleevite=3.77 gm/cc.

Fermion Index

Fermion Index = 0.09127
Boson Index = 0.90873

Photoelectric:

PE_Maleevite= 173.72 barns/electron
U=PE_Maleevite x r_electron= 603.47 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Maleevite is Not Radioactive

Maleevite Classification

Dana Class:

56.3.1.2 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

(56.3)with [Si2O7] with borate groups

(56.3.1)Danburite Goup

56.3.1.1 Danburite CaB2(SiO4)2 Pnam 2/m 2/m 2/m

56.3.1.2 Maleevite ! BaB2Si2O8 P nma 2/m 2/m 2/m

56.3.1.3 Pekovite! SrB2Si2O8 P nma 2/m 2/m 2/m

Strunz Class:

VIII/J.08-40 VIII - Silicates

VIII/J - Tectosilicates (network) without anions unfamiliar to the tetraheders

VIII/J.08 - Reedmergnerite - Danburite series

VIII/J.08-10 Reedmergnerite NaBSi3O8 C1 1

VIII/J.08-20 Danburite CaB2(SiO4)2 Pnam 2/m 2/m 2/m

VIII/J.08-30 Pekovite! SrB2Si2O8 P nma 2/m 2/m 2/m

VIII/J.08-40 Maleevite BaB2Si2O8 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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Print or Cut-and-Paste your Maleevite Specimen Label here :

Maleevite

BaB2Si2O8
Dana No: 56.3.1.2 Strunz No: VIII/J.08-40
Locality:

Notes: