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Badakhshanite-(Y)

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Formula:
Y2Mn4Al(Si2B7BeO24)
Colour:
yellow-brown
Lustre:
Vitreous
Hardness:
6½ - 7
Specific Gravity:
4.41 (Calculated)
Crystal System:
Orthorhombic
Related to perettiite-(Y) of which it is the AlBe-analogue.

Crystal structure details:
- tetrahedra form layers || (010) comprising of four different tetrahedrally coordinated sites: Si, B(1), B(2), and T;
- the above elements constitute 4-, 5-, and 8-membered rings of the Si2B7BeO24 composition;
- 3 cation sites between the above sheets: M(1), occupied by Y(REE); M(2), occupied by Mn2+(Y,Ca,Fe2+); and M(3), occupied by Al(Sc);
- ideal composition of the M(1,2) sites is Y2Mn4;
- M(3) site is, ideally, 1 Al apfu



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Classification of Badakhshanite-(Y)Hide

Approved, Pending publication
Approval Year:
2018

Physical Properties of Badakhshanite-(Y)Hide

Vitreous
Colour:
yellow-brown
Comment:
transparent and pale yellow in thin section
Streak:
white
Hardness:
6½ - 7 on Mohs scale
Tenacity:
Brittle
Fracture:
Conchoidal
Density:
4.41 g/cm3 (Calculated)

Optical Data of Badakhshanite-(Y)Hide

Type:
Biaxial (-)
RI values:
nα = 1.805(2) nβ = 1.827 nγ = 1.853(3)
Warning: A non-numeric value encountered in /home/mindat/www/show_class.php on line 4243
2V:
Measured: -60° (10)
Max Birefringence:
δ = 0.048
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
weak r > v
Optical Extinction:
straight extinction, negative elongation
Pleochroism:
Non-pleochroic

Chemical Properties of Badakhshanite-(Y)Hide

Formula:
Y2Mn4Al(Si2B7BeO24)
Emperical Formula (of original material):
[Y1.21(Yb0.47Lu0.12Dy0.04Er0.07Tm0.03Ho0.01Gd0.02Sm0.01Tb0.01)Σ0.78Th0.01)Σ2(Mn3.47Y0.34Ca0.11Fe2+0.08)Σ4(Al0.63Sc0.24Fe2+0.06□0.07)Σ1[(Si2.10B6.69Be1.20)Σ9.99O24]

Crystallography of Badakhshanite-(Y)Hide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Setting:
Pnma
Cell Parameters:
a = 12.852(1) Å, b = 4.5848(5) Å, c = 12.8539(8) Å
Ratio:
a:b:c = 2.803 : 1 : 2.804
Unit Cell V:
757.38 ų
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.07 Å(45)
4.59 Å(42)
4.07 Å(39)
3.042 Å(100)
2.637 Å(68)
2.533 Å(60)
2.119 Å(32)
1.828 Å(36)

Type Occurrence of Badakhshanite-(Y)Hide

General Appearance of Type Material:
single, columnar crystals, 50 to 400 μm in length, as inclusions in spessartine and tourmaline; rarely: crystals within blebs along garnet-tourmaline-quartz boudaries
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskiy Prospekt 18-2, Moscow 119071, Russia, registration number 5235/1.
Geological Setting of Type Material:
medium- to coarse-grained, non-graphic, miarolitic granitic pegmatite
Associated Minerals at Type Locality:

Synonyms of Badakhshanite-(Y)Hide

Other InformationHide

IR Spectrum:
confirms lacking OH and H2O
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Badakhshanite-(Y)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Pautov, L.A., Mirakov, M.A., Cámara Artigas, F., Sokolova, E., Hawthorne, F.C., Schodibekov, M.A. and Karpenko, V.Y. (2018) Badakhshanite-(Y), IMA 2018-085. CNMNC Newsletter No. 46, December 2018, page xxxx; Mineralogical Magazine, 82, xxxx–xxxx.
Pautov, L.A., Mirakov, M.A., Cámara, F., Sokolova, E., Hawthorne F.C., Schodibekov, M.A., Karpenko, V.Yu (2020): Badakhshanite-(Y), Y2Mn4Al(Si2B7BeO24), a New Mineral Species of the Perettiite Group from a Granite Miarolic Pegmatite in Eastern Pamir, the Gorno Badakhshan Autonomous Oblast, Tajikistan. Canadian Mineralogist: 58, (in press)

Internet Links for Badakhshanite-(Y)Hide

Localities for Badakhshanite-(Y)Hide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Tajikistan (TL)
 
  • Gorno-Badakhshan
    • Murghob
Pautov, L.A., Mirakov, M.A., Cámara Artigas, F., Sokolova, E., Hawthorne, F.C., Schodibekov, M.A. and Karpenko, V.Y. (2018) Badakhshanite-(Y), IMA 2018-085. CNMNC Newsletter No. 46, December 2018, page xxxx; Mineralogical Magazine, 82, xxxx–xxxx
 
Mineral and/or Locality  
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