Surkhobite Mineral Data

Surkhobite Mineral Data

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General Surkhobite Information

Chemical Formula:

(Ca,Na)(Ba,K)(Fe++,Mn)4Ti2(Si4O14)O2(F,OH,O)3

Composition:

Molecular Weight = 902.39 gm

Potassium 1.08 % K 1.30 % K₂O

Barium 12.94 % Ba 14.44 % BaO

Sodium 1.17 % Na 1.58 % Na₂O

Calcium 3.38 % Ca 4.72 % CaO

Zirconium 1.82 % Zr 2.46 % ZrO₂

Titanium 8.38 % Ti 13.99 % TiO₂

Manganese 9.86 % Mn 12.73 % MnO

Niobium 0.72 % Nb 1.03 % Nb₂O₅

Aluminum 0.57 % Al 1.07 % Al₂O₃

Iron 12.50 % Fe 12.98 % FeO / 3.45 % Fe₂O₃

Silicon 12.48 % Si 26.70 % SiO₂

Hydrogen 0.13 % H 1.17 % H₂O

Oxygen 30.90 % O

Fluorine 4.06 % F 4.06 % F

- % F -1.71 % -O=F₂

______ ______

100.00 % 99.98 % = TOTAL OXIDE

Empirical Formula:

Ca_0.76Na_0.46Ba_0.85K_0.25Fe²⁺_1.63Mn²⁺_1.62Fe³⁺_0.39Al_0.19Ti_1.58Zr_0.18Nb_0.07Si_4.01O₁₄ O_2.26F_1.93(OH)_1.17

Environment:

Rare-metal syenite pegmatite. Bafertisite series; structure determined

IMA Status:

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

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Surkhobite Crystallography

Axial Ratios:

a:b:c =0.7746:1:1.5034

Cell Dimensions:

a = 10.719, b = 13.838, c = 20.805, Z = 8; beta = 95.09° V = 3,073.83 Den(Calc)= 3.90

Crystal System:

Monoclinic - SphenoidalH-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

Diaphaniety:

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).

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Surkhobite

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:

r_electron=3.69 gm/cc
note: r_Surkhobite=3.90 gm/cc.

Fermion Index

Fermion Index = 0.0446
Boson Index = 0.9554

Photoelectric:

PE_Surkhobite= 67.25 barns/electron
U=PE_Surkhobite x r_electron= 248.26 barns/cc.

Radioactivity:

GRapi = 14.78 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Surkhobite - barely detectable

Surkhobite Classification

Dana Class:

56.2.6b.4 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

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

(56.2.6b)Seidozerite - Lamprophyllite group (Bafertisite subgroup)

56.2.6b.1 Bafertisite Ba(Fe,Mn)2TiSi2O7(O,OH)2 Cm m

56.2.6b.2 Hejtmanite Ba(Mn,Fe)2TiO(Si2O7)(OH,F)2 P 2₁/m 2/m

56.2.6b.3 Nafertisite! Na3(Fe,Fe)6(Ti2Si12O34)(O,OH)7·2(H2O) A2/m 2/m

56.2.6b.4 Surkhobite ! (Ca,Na)(Ba,K)(Fe,Mn)4Ti2(Si4O14)O2(F,OH,O)3 C 2 2

Strunz Class:

VIII/CX.00-00 VIII - Silicates

VIII/CX - Unclassified Strunz Sorosilicates

VIII/CX.00 - Lamprophyllite Group

Other Surkhobite Information

References:

NAME( AmMin, v 89, p 469) PHYS. PROP.(AmMin, v 89, p 469) OPTIC PROP.(AmMin, v 89, p 469)

See Also:

Links to other databases for Surkhobite :
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 Surkhobite Specimen Label here :

Surkhobite

(Ca,Na)(Ba,K)(Fe++,Mn)4Ti2(Si4O14)O2(F,OH,O)3
Dana No: 56.2.6b.4 Strunz No: VIII/CX.00-00
Locality:

Notes: