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Bulgakite

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Formula:
Li2(Ca,Na)Fe2+7Ti2(Si4O12)2O2(OH)4(F,O)(H2O)2
Colour:
Brownish orange
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
3.30 - 3.326
Crystal System:
Triclinic
Name:
Named after Lev Vasil'evich Bulgak (Лев Васильевич Булгак) (b. 1955), Russian mineralogist, gemologist, and discoverer of several new minerals. He worked at the A. E. Fersman Mineralogical Museum (1975-2003).
Bulgakite is a Ca-analogue of nalivkinite.


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Classification of BulgakiteHide

Approved
Approval Year:
2014
First Published:
2016

Physical Properties of BulgakiteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Brownish orange
Streak:
pale brown streak
Hardness:
Hardness:
VHN100=204 - Vickers
Tenacity:
Brittle
Cleavage:
Perfect
Perfect parallel to {001} and moderate parallel to {010}
Fracture:
Hackly
Density:
3.30 - 3.326 g/cm3 (Measured)    3.326 g/cm3 (Calculated)

Optical Data of BulgakiteHide

Type:
Biaxial (+)
RI values:
nα = 1.695(3) nβ = 1.711(2) nγ = 1.750(3)
2V:
Measured: 70° (5), Calculated: 67°
Max Birefringence:
δ = 0.055
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
Strong: r > v
Pleochroism:
Visible
Comments:
X = intensive reddish brown, Y = light brown, Z = greenish
light brown

Chemical Properties of BulgakiteHide

Formula:
Li2(Ca,Na)Fe2+7Ti2(Si4O12)2O2(OH)4(F,O)(H2O)2
IMA Formula:
Li2(Ca,Na)Fe2+7Ti2(Si4O12)2O2(OH)4(O,F)(H2O)2

Crystallography of BulgakiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 5.374(1) Å, b = 11.965(2) Å, c = 11.654(3) Å
α = 113.457(8)°, β = 94.533(8)°, γ = 103.084(10)°
Ratio:
a:b:c = 0.449 : 1 : 0.974
Unit Cell V:
657.5 ų
Z:
1

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.54Å(100)
3.50Å(100)
2.783Å(90)
2.647Å(55)
2.578Å(100)
1.760Å(52)
1.660Å(46)
1.576Å(68)
Comments:
From Type Description.

Type Occurrence of BulgakiteHide

Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4572/1
Geological Setting of Type Material:
Fenitized amphibole–quartz–feldspar rock from a glacial morraine
Associated Minerals at Type Locality:
Reference:
Agakhanov, A.A., Pautov, L.A., Sokolova, E., Abdu, Y.A., Karpenko, V.Y. (2016) Two Astrophyllite-Supergroup Minerals: Bulgakite, A New Mineral From the Darai-Pioz Alkaline Massif, Tajikistan and Revision of the Crystal Structure and Chemical Formula of Nalivkinite. The Canadian Mineralogist: 54: 33-48.

Synonyms of BulgakiteHide

Relationship of Bulgakite to other SpeciesHide

Other Members of this group:
AstrophylliteK2NaFe2+7Ti2Si8O26(OH)4FTric. 1 : P1
Hydroastrophyllite(H3O,K,Ca)3(Fe,Mn)5-65Ti2Si8(O,OH)31Tric.
NalivkiniteLi2Na(Fe2+,Mn2+)7Ti2Si8O26(OH)4FTric. 1 : P1
Niobophyllite(K,Na)3(Fe,Mn)6(Nb,Ti)2Si8(O,OH,F)31Tric.
Tarbagataite(K□)Ca(Fe2+,Mn)7Ti2(Si4O12)2O2(OH)5Tric. 1 : P1
ZircophylliteK2NaFe2+7Zr2(Si4O12)2O2(OH)4FTric.

Fluorescence of BulgakiteHide

Other InformationHide

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 BulgakiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Agakhanov, A.A., Pautov, L.A., Sokolova, E., Hawthorne, F.C. and Karpenko, V.Y. (2014) Bulgakite, IMA 2014-041. CNMNC Newsletter No. 22, October 2014, page 1242. Mineralogical Magazine: 78: 1241-1248.
Agakhanov, A.A., Pautov, L.A., Sokolova, E., Abdu, Y.A., Karpenko, V.Y. (2016) Two Astrophyllite-Supergroup Minerals: Bulgakite, A New Mineral From the Darai-Pioz Alkaline Massif, Tajikistan and Revision of the Crystal Structure and Chemical Formula of Nalivkinite. The Canadian Mineralogist: 54: 33-48.

Internet Links for BulgakiteHide

Localities for BulgakiteHide

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)
 
  • Districts of Republican Subordination
Agakhanov, A.A., Pautov, L.A., Sokolova, E., Abdu, Y.A., Karpenko, V.Y. (2016): Two Astrophyllite-Supergroup Minerals: Bulgakite, A New Mineral From the Darai-Pioz Alkaline Massif, Tajikistan and Revision of the Crystal Structure and Chemical Formula of Nalivkinite. Canadian Mineralogist: 54: 33-48.
 
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