Surkhobite Mineral Data

General Surkhobite Information

Chemical Formula:

KBa3Ca2Na2(Mn, Fe++,Fe+++)16Ti8(Si2O7)8O8(OH)4 (F,O,OH)8

Composition:

Molecular Weight = 3,523.22 gm

Potassium 1.56 % K 1.88 % K₂O

Barium 10.06 % Ba 11.23 % BaO

Sodium 1.70 % Na 2.29 % Na₂O

Strontium 0.22 % Sr 0.26 % SrO

Calcium 1.82 % Ca 2.55 % CaO

Magnesium 0.08 % Mg 0.13 % MgO

Zirconium 0.26 % Zr 0.35 % ZrO₂

Titanium 9.74 % Ti 16.26 % TiO₂

Manganese 12.74 % Mn 16.45 % MnO

Niobium 1.50 % Nb 2.15 % Nb₂O₅

Aluminum 0.01 % Al 0.01 % Al₂O₃

Iron 12.40 % Fe 14.03 % FeO / 2.13 % Fe₂O₃

Silicon 12.80 % Si 27.39 % SiO₂

Hydrogen 0.13 % H 1.18 % H₂O

Oxygen 32.02 % O

Fluorine 2.96 % F 2.96 % F

- % F -1.25 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na_2.6K_1.41Ca_1.6Sr_0.09Ba_2.58Mn²⁺_8.17Fe²⁺_6.88Fe³⁺_0.94Mg_0.11Al_0.01Ti_7.17Nb_0.57Zr_0.1 Si_16.06H_4.61F_5.49O_70.51

Environment:

Rare-metal syenite pegmatite. Discredited because surkhobite (2003) is considered to be junshajiangite (1981). Redefined with new formula 2008.

IMA Status:

Redifined IMA 2008, Discredited IMA 2007, Approved IMA 2003 (Dana # Added)

Locality:

Serkhob River Basin, Dara-i-Pioz massif, Central Tajikistan. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

IMA2002-037

IMA2007-06-E - Surkhobite Discredited

IMA2008-07-A - Surkhobite Redifined

Surkhobite Image

Images:

Surkhobite

Comments: Small grain of reddish surkhobite.
Location: Dara-i-Pioz Glacier, Altai Range, Tajikistan. Scale: Graph Size 1 mm.
© Sergey Vasiliev / Systematic Mineralogy

Surkhobite Crystallography

Axial Ratios:

a:b:c =0.7746:1:1.5034

Cell Dimensions:

a = 10.719, b = 13.838, c = 20.805, Z = 2; beta = 95.09° V = 3,073.83 Den(Calc)= 3.81

Crystal System:

Monoclinic - Sphenoidal H-M Symbol (2) Space Group: C 2

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

By Intensity(I/I_o): 3.454(1)(006), 2.592(0.7)(008), 2.074(0.4)(048),10.39(0.2)(002), 1.728(0.15)(602,371,370)2.862(0.15)(225), 3.186(0.15),

Physical Properties of Surkhobite

Cleavage:

{001} Perfect

Color:

Brownish red.

Density:

3.84

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Surkhobite

Gladstone-Dale:

CI meas= 0.029 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2219,KPDmeas= 0.2201,KC= 0.2267
Ncalc = 1.86 - 1.87

Optical Data:

Biaxial (-), a=1.79, b=1.858, g=1.888, bire=0.0980, 2V(Calc)=64, 2V(Meas)=65. Dispersion r < v strong.

Calculated Properties of Surkhobite

Electron Density:

Bulk Density (Electron Density)=3.62 gm/cc
note: Specific Gravity of Surkhobite =3.81 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Surkhobite= 54.99 barns/electron
U=PE_Surkhobite x r_electron= 198.90 barns/cc.

Radioactivity:

GRapi = 21.43 (Gamma Ray American Petroleum Institute Units)
Concentration of Surkhobite per GRapi unit = 4.67 (%)

Estimated Radioactivity from Surkhobite - barely detectable

Surkhobite Classification

Dana Class:

56.02.06b.04 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

(56.02)with cations in [4] and/or >[4] coordination

(56.02.06b)Seidozerite - Lamprophyllite group (Bafertisite subgroup)

56.02.06b.01 Bafertisite Ba(Fe,Mn)2TiSi2O7(O,OH)2 Cm m

56.02.06b.02 Hejtmanite Ba(Mn,Fe)2TiO(Si2O7)(OH,F)2 P 2₁/m 2/m

56.02.06b.03 Nafertisite! Na3(Fe,Fe)6(Ti2Si12O34)(O,OH)7•2(H2O) A2/m 2/m

56.02.06b.04 Surkhobite! KBa3Ca2Na2(Mn,Fe,Fe)16Ti8(Si2O7)8O8(OH)4(F,O,OH)8 C 2 2

56.02.06b.05 Nechelyustovite! (Ba,Na)2{(Na,Ti,Mn)4[(Ti,Nb)2O2Si4O14](OH,O,F)2}•4.5H2O P 2/m 2/m

56.02.06b.06 Caryochroite! (Na,Sr)3(Fe,Mg)10[Ti2Si12O37](O,OH)9•8H2O P 2/n (?) 2/m

Strunz Class:

09.BE.67 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BE -Si2O7 groups with additional anions;

09.BE.67 Jinshajiangite Na2K5BaCa(Fe,Mn)8(Ti,Fe,Nb,Zr)4Si8O32(O,F,H2O)6 C 2/m,Cm,C 2 Mono

09.BE.67 Perraultite (Na,Ca)2(Ba,K)2(Mn,Fe)8(Ti,Nb)4Si8O32(OH,F,O)6 C 2 2

09.BE.67 Surkhobite KBa3Ca2Na2(Mn,Fe,Fe)16Ti8(Si2O7)8O8(OH)4(F,O,OH)8 C 2 2

Other Surkhobite Information

References:

NAME( AmMin, v 89, p 469) PHYS. PROP.(AmMin, v89:469 and v93:1944) OPTIC PROP.(AmMin, v 89, p 469)

See Also:

Links to other databases for Surkhobite :
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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Surkhobite

KBa3Ca2Na2(Mn, Fe++,Fe+++)16Ti8(Si2O7)8O8(OH)4 (F,O,OH)8
Dana No: 56.02.06b.04 Strunz No: 09.BE.67
Locality:

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