Badakhshanite-(Y) (original) (raw)

A valid IMA mineral species

Formula:

Y2Mn4Al(Si2B7BeO24)

Specific Gravity:

4.41 (Calculated)

Crystal System:

Orthorhombic

Name:

Named for the Gorno-Badakhshan Oblast, Tajikistan, that includes the type locality. The oblast makes up 45% of the land area of the country but holds only 3% of its population.

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

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:53212:5

26ddbead-3373-4ead-b7ca-8d14becb26b2

IMA Classification of Badakhshanite-(Y)Hide

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Type description reference:

Pautov, Leonid A., Mirakov, Mirak A., Cámara, Fernando, Sokolova, Elena, Hawthorne, Frank C., Schodibekov, Manuchekhr A., Karpenko, Vladimir 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. The Canadian Mineralogist, 58 (3) 381-394 doi:10.3749/canmin.2000003

Classification of Badakhshanite-(Y)Hide

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9.EA.45

9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of Badakhshanite-(Y)Hide

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Comment:

Transparent and pale yellow in thin section.

Density:

4.41 g/cm3 (Calculated)

Comment:

Density calculated using the empirical formula. It is 4.25 g/cm3 using the ideal formula.

Optical Data of Badakhshanite-(Y)Hide

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RI values:

_n_α = 1.805(2) _n_β = 1.827 _n_γ = 1.853(3)

δ = 0.048

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Optical Extinction:

Straight extinction, negative elongation.

Chemistry of Badakhshanite-(Y)Hide

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Mindat Formula:

Y2Mn4Al(Si2B7BeO24)

Crystallography of Badakhshanite-(Y)Hide

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Crystal System:

Orthorhombic

Class (H-M):

m m m _(_2/_m_2/_m_2/m ) - Dipyramidal

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

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of Badakhshanite-(Y)Hide

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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:

Reference:

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. The Canadian Mineralogist: 58(3): 381–394.

Synonyms of Badakhshanite-(Y)Hide

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Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of Badakhshanite-(Y)Hide

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Other InformationHide

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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.

Internet Links for Badakhshanite-(Y)Hide

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References for Badakhshanite-(Y)Hide

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Reference List:

Pautov, Leonid A., Mirakov, Mirak A., Cámara, Fernando, Sokolova, Elena, Hawthorne, Frank C., Schodibekov, Manuchekhr A., Karpenko, Vladimir 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. The Canadian Mineralogist, 58 (3) 381-394 doi:10.3749/canmin.2000003

Localities for Badakhshanite-(Y)Hide

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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

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.