Mineralogy Database

Kochite Mineral Data

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General Kochite Information

Help on Chemical  Formula: Chemical Formula: Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4
Help on Composition: Composition: Molecular Weight = 1,505.08 gm
   Sodium      7.90 %  Na   10.64 % Na2O
   Strontium   0.12 %  Sr    0.14 % SrO
   Calcium    15.74 %  Ca   22.02 % CaO
   Lanthanum   0.18 %  La    0.22 % La2O3
   Cerium      0.47 %  Ce    0.55 % Ce2O3
   Yttrium     0.30 %  Y     0.38 % Y2O3
   Hafnium     0.12 %  Hf    0.14 % HfO2
   Zirconium   9.21 %  Zr   12.44 % ZrO2
   Titanium    5.22 %  Ti    8.70 % TiO2
   Manganese   3.91 %  Mn    5.04 % MnO
   Niobium     1.36 %  Nb    1.94 % Nb2O5
   Aluminum    0.04 %  Al    0.07 % Al2O3
   Vanadium    0.03 %  V     0.05 % V2O3
   Iron        0.85 %  Fe    1.10 % FeO
   Silicon    15.19 %  Si   32.50 % SiO2
   Oxygen     32.35 %  O
   Fluorine    7.03 %  F     7.03 % F
                -   %   F    -2.96 % -O=F2    
             ______        ______ 
             100.00 %       99.99 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na1.92Sr0.02Na2.77Ca1.23Ca3.52Na0.48Mn2+1.07Ca0.81Y0.05Ce0.05La0.02Zr1.41Fe2+0.23 Ca0.35Hf0.01Ti1.64Nb0.22Zr0.11Al0.02F1.57
Help on Environment: Environment: Found in nepheline syenite rocks at Hvide Ryg.
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Werner Bjerge alkaline complex, East Greenland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Lauge Koch (1892-1964), Danish geologist who mapped Werner Bjerge.
Help on Synonym: Synonym: IMA2002-012
 

Kochite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8852:1:0.6354
Help on Cell Dimensions: Cell Dimensions: a = 10.032, b = 11.333, c = 7.202, Z = 1; alpha = 90.192°, beta = 100.334°, gamma = 111.551° V = 749.21 Den(Calc)= 3.34
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.908(1)(122,222), 2.6(0.8)(040), 1.868(0.6)(422,522), 3.028(0.6)(211), 1.67(0.5)(340), 3.951(0.3),
 

Physical Properties of Kochite

Help on Cleavage: Cleavage: {100} Perfect
Help on Color: Color: Colorless, Pale brown.
Help on Density: Density: 3.32
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Kochite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.032 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.04 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2087,KPDmeas= 0.2105,KC= 0.2174
Ncalc = 1.72 - 1.73
Help on Optical Data: Optical Data: Biaxial (+), a=1.684, b=1.695, g=1.718, bire=0.0340
 

Calculated Properties of Kochite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.22 gm/cc
note: Specific Gravity of Kochite =3.32 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEKochite = 23.77 barns/electron
U=PEKochite x relectron= 76.48 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 671.86 (Gamma Ray American Petroleum Institute Units)
Concentration of Kochite per GRapi unit =1,488.39 (PPM)

Estimated Radioactivity from Kochite - mild
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 / 8.32 cm 14,561 3.94E-07 671.86 0.22
100 gm / 3.86 cm 1,456 3.94E-08 67.19 0.02
10 gm / 1.79 cm 146 3.94E-09 6.72 0.00
1 gm / 8.32 mm 15 3.94E-10 0.67 0.00
0.1 gm / 3.86 mm 1 3.94E-11 0.07 0.00
0.01 gm / 1.79 mm 0 3.94E-12 0.01 0.00
0.001 gm / 0.83 mm 0 3.94E-13 0.00 0.00

Weight of pure Kochite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.32 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
Estimated Thorium Activity ( 0.03 % Th) From Sum REE Elements ( 0.65 % REE)
 

Kochite Classification

Help on  Dana Class: Dana Class: 56.02.04.17 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.02)with cations in [4] and/or >[4] coordination
  (56.02.04)Cuspidine - Wohlerite group
 
56.02.04.01 Baghdadite Ca3(Zr,Ti)Si2O9 P 21/a 2/m
 
56.02.04.02 Burpalite Na2CaZrSi2O7F2 P 21/a 2/m
 
56.02.04.03 Cuspidine Ca4Si2O7(F,OH)2 P 21/c 2/m
 
56.02.04.04 Lavenite (Na,Ca)2(Mn,Fe)(Zr,Ti,Nb)Si2O7(O,OH,F) P 21/a 2/m
 
56.02.04.05 Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P 21/m 2/m
 
56.02.04.06 Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m
 
56.02.04.07 Hiortdahlite (Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2 P1 1
 
56.02.04.08 Rosenbuschite (Ca,Na)3(Zr,Ti)Si2O8F P1 1
 
56.02.04.09 Hainite Na4Ca8(Ti,Zr,Mn,Fe)3Si8O28F8 P1 1
 
56.02.04.10 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P 21/n 2/m
 
56.02.04.11 Jennite Ca9Si6O18(OH)6•8H2O P1 1
 
56.02.04.12 Komarovite (Ca,Mn)2(Nb,Ti)2Si2O7(O,F)2•3.5(H2O) Unk Ortho
 
56.02.04.13 Natrokomarovite* Na6CaNb6[Si4O12F2•4(H2O) C mmm 2/m 2/m 2/m
 
56.02.04.14 Suolunite Ca2Si2O5(OH)2•(H2O) F dd2 mm2
 
56.02.04.15 Mongolite Ca4Nb6Si5O24(OH)10•5(H2O) Unk Tetra
 
56.02.04.16 Kristiansenite! Ca2ScSn(Si2O7)(Si2O6OH) C1 1
 
56.02.04.17 Kochite! Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4 P1 1
 
56.02.04.18 Marianoite! Na2Ca4(Nb,Zr)2(Si2O7)2(O,F)4 P 21 2/m
Help on  Strunz Class: Strunz Class: 09.BE.22 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
 
09.BE.22 Hainite Na4Ca8(Ti,Zr,Mn,Fe)3Si8O28F8 P1 1
 
09.BE.22 Gotzenite (Ca,Na)3(Ti,Al)Si2O7(F,OH)2 P1 1
 
09.BE.22 Rosenbuschite (Ca,Na)3(Zr,Ti)Si2O8F P1 1
 
09.BE.22 Kochite! Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4 P1 1
 

Other Kochite Information

Help on References: References: NAME( AmMin, 88:230) PHYS. PROP.(AmMin, 88:230) OPTIC PROP.(AmMin, 88:230)
Help on See Also: See Also: Links to other databases for Kochite :
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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Print or Cut-and-Paste your Kochite Specimen Label here :

Kochite

Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4
Dana No: 56.02.04.17 Strunz No: 09.BE.22
Locality:

 

Notes:

 

 
   
 


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