Mineralogy Database

Turkestanite Mineral Data

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General Turkestanite Information

Help on Chemical  Formula: Chemical Formula: Th(Ca,Na)2(K1-x,[ ]x)Si8O20•n(H2O)
Help on Composition: Composition: Molecular Weight = 879.42 gm
   Potassium   2.67 %  K     3.21 % K2O
   Sodium      1.31 %  Na    1.76 % Na2O
   Calcium     6.84 %  Ca    9.56 % CaO
   Thorium    21.11 %  Th   24.02 % ThO2
   Silicon    25.55 %  Si   54.66 % SiO2
   Hydrogen    0.69 %  H     6.15 % H2O
   Oxygen     41.84 %  O
             ______        ______ 
             100.00 %       99.36 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Th0.8Ca1.5Na0.5K0.6Si8O20•3(H2O)
Help on Environment: Environment: Found in the albitized exocontact zone at the Djelisu and Dara-Pioz alkaline complexes. The calcium dominant analog of steacyite.
Help on IMA Status: IMA Status: Approved IMA 1996 (Dana # Added)
Help on Locality: Locality: Located 40 km apart north and south, respectively, of the Turkestan - Tadjikistan border. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the discovery locality, along the Turkestan Ridge.
Help on Name Pronunciation: Name Pronunciation: Turkestanite + Pronunciation Say TURKESTANITE
Help on Synonym: Synonym: IMA1996-036
 

Turkestanite Image

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  Turkestanite

Comments: Green, blocky, prismatic crystal of turkestanite in matrix.
Location: Dara-i-Pioz Glacier, Alayskiy (Alai) Range, Tien Shan Mts, Districts of the Republican Subordination, Tajikistan. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Turkestanite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.95258
Help on Cell Dimensions: Cell Dimensions: a = 7.592, c = 14.824, Z = 2; V = 854.43 Den(Calc)= 3.42
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 4/mcc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.4(1), 5.31(0.7), 2.654(0.59),
 

Physical Properties of Turkestanite

Help on Cleavage: Cleavage: {111} Imperfect, {111} Imperfect, {111} Imperfect
Help on Color: Color: Apple green, Dark green, Brown.
Help on Density: Density: 3.36
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 5.5-6 - Knife Blade-Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Turkestanite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.114 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.13 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1779,KPDmeas= 0.1811,KC= 0.2044
Ncalc = 1.69 - 1.7
Help on Optical Data: Optical Data: Uniaxial (-), e=1.606, w=1.611, bire=0.0050.
 

Calculated Properties of Turkestanite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.22 gm/cc
note: Specific Gravity of Turkestanite =3.36 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PETurkestanite = 466.07 barns/electron
U=PETurkestanite x relectron=1,499.01 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 431,084.28 (Gamma Ray American Petroleum Institute Units)
Concentration of Turkestanite per GRapi unit = 2.32 (PPM)

Turkestanite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 70.56 ± 17.64 grams of pure Turkestanite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 7055.9 ±1764.0 grams of pure Turkestanite .

Estimated Radioactivity from Turkestanite - strong
Specimen
Size
Weight/Volume
(Sphere)
*
Calculated
Activity
Bequerols
(Bq)
Calculated
Activity
Curies (Ci)
Estimated
Activity
GR(api)
Estimated
Exposure
(mRem**)/hr
If Held in Hand
For One Hour
1000 gm / 8.28 cm 9,457,329 2.56E-04 431,084.28 141.73
100 gm / 3.84 cm 945,733 2.56E-05 43,108.43 14.17
10 gm / 1.78 cm 94,573 2.56E-06 4,310.84 1.42
1 gm / 8.28 mm 9,457 2.56E-07 431.08 0.14
0.1 gm / 3.84 mm 946 2.56E-08 43.11 0.01
0.01 gm / 1.78 mm 95 2.56E-09 4.31 0.00
0.001 gm / 0.83 mm 9 2.56E-10 0.43 0.00

Weight of pure Turkestanite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.36 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
 

Turkestanite Classification

Help on  Dana Class: Dana Class: 63.01.01.03 (63)Cyclosilicate Condensed Rings
  (63.01)4-membered rings
  (63.01.01)Steacyite Group
 
63.01.01.01 Steacyite K1-x(Ca,Na)2ThSi8O20(x=0.2to0.4) P 4/mcc 4/m 2/m 2/m
 
63.01.01.02 Iraqite-(La) K(La,Ce,Th)2(Ca,Na)4(Si,Al)16O40 P 4/mcc 4/m 2/m 2/m
 
63.01.01.03 Turkestanite! Th(Ca,Na)2(K1-x,[]x)Si8O20•n(H2O) P 4/mcc 4/m 2/m 2/m
 
63.01.01.04 Arapovite! (U,Th)(Ca,Na)2(K1-x[]x)Si8O20•H2O,x=0.5 P 4/mcc 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.CH.10 09 - SILICATES (Germanates)
  09.C - Cyclosilicates
  09.CH -[Si4O12]8- 4-membered double rings
 
09.CH.10 Iraqite-(La) K(La,Ce,Th)2(Ca,Na)4(Si,Al)16O40 P 4/mcc 4/m 2/m 2/m
 
09.CH.10 Steacyite K1-x(Ca,Na)2ThSi8O20(x=0.2to0.4) P 4/mcc 4/m 2/m 2/m
 
09.CH.10 Turkestanite! Th(Ca,Na)2(K1-x,[]x)Si8O20•n(H2O) P 4/mcc 4/m 2/m 2/m
 
09.CH.10 Arapovite! (U,Th)(Ca,Na)2(K1-x[]x)Si8O20•H2O,x=0.5 P 4/mcc 4/m 2/m 2/m
 

Other Turkestanite Information

Help on References: References: NAME( CanMin, 8/99) PHYS. PROP.(MinRec, V 31, No. 2) OPTIC PROP.(MinRec, V 31, No. 2)
Help on See Also: See Also: Links to other databases for Turkestanite :
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
11 - Uranium Minerals
12 - WWW-MINCRYST

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Turkestanite

Th(Ca,Na)2(K1-x,[ ]x)Si8O20•n(H2O)
Dana No: 63.01.01.03 Strunz No: 09.CH.10
Locality:

 

Notes:

 

 
   
 


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