General Kochite Information
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Chemical Formula: |
Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4 |
Composition: |
Molecular Weight = 1,505.08 gm |
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Sodium 7.90 % Na 10.64 % Na2O |
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Strontium 0.12 % Sr 0.14 % SrO |
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Calcium 15.74 % Ca 22.02 % CaO |
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Lanthanum 0.18 % La 0.22 % La2O3 |
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Cerium 0.47 % Ce 0.55 % Ce2O3 |
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Yttrium 0.30 % Y 0.38 % Y2O3 |
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Hafnium 0.12 % Hf 0.14 % HfO2 |
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Zirconium 9.21 % Zr 12.44 % ZrO2 |
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Titanium 5.22 % Ti 8.70 % TiO2 |
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Manganese 3.91 % Mn 5.04 % MnO |
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Niobium 1.36 % Nb 1.94 % Nb2O5 |
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Aluminum 0.04 % Al 0.07 % Al2O3 |
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Vanadium 0.03 % V 0.05 % V2O3 |
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Iron 0.85 % Fe 1.10 % FeO |
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Silicon 15.19 % Si 32.50 % SiO2 |
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Oxygen 32.35 % O |
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Fluorine 7.03 % F 7.03 % F |
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- % F -2.96 % -O=F2 |
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______ ______ |
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100.00 % 99.99 % = TOTAL OXIDE |
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 |
Environment: |
Found in nepheline syenite rocks at Hvide Ryg. |
IMA Status: |
Approved IMA 2003 (Dana # Added) |
Locality: |
Werner Bjerge alkaline complex, East Greenland. Link to MinDat.org Location Data. |
Name Origin: |
Named for Lauge Koch (1892-1964), Danish geologist who mapped Werner Bjerge. |
Synonym: |
IMA2002-012 |
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Images:
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Kochite Crystallography
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Axial Ratios: |
a:b:c =0.8852:1:0.6354 |
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 |
Crystal System: |
Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1 |
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), |
Crystal Structure:
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Christiansen C C , Gault R A , Grice J D , Johnsen O , European Journal of Mineralogy , 15 (2003) p.551-554, Kochite, a new member of the rosenbuschite group from the Werner, Bjerge alkaline complex, East Greenland, Locality: Werner Bjerge alkaline complex, East Greenland
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Physical Properties of Kochite
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Cleavage: |
[100] Perfect |
Color: |
Colorless, Pale brown. |
Density: |
3.32 |
Diaphaniety: |
Transparent |
Fracture: |
Brittle - Uneven - Very brittle fracture producing uneven fragments. |
Habit: |
Acicular - Occurs as needle-like crystals. |
Habit: |
Aggregates - Made of numerous individual crystals or clusters. |
Habit: |
Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape. |
Hardness: |
5 - Apatite |
Luster: |
Vitreous (Glassy) |
Streak: |
white |
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Optical Properties of Kochite
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Gladstone-Dale: |
CI meas= 0.032 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.037 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2093,KPDmeas= 0.2105,KC= 0.2174 |
Optical Data: |
Biaxial (+), a=1.684, b=1.695, g=1.718, bire=0.0340 |
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Calculated Properties of Kochite
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Electron Density: |
relectron=3.22 gm/cc note: rKochite =3.32 gm/cc. |
Fermion Index |
Fermion Index = 0.02519 Boson Index = 0.97481 |
Photoelectric: |
PEKochite = 23.77 barns/electron U=PEKochite x relectron= 76.48 barns/cc. |
Radioactivity: |
GRapi = 671.86 (Gamma Ray American Petroleum Institute Units)
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)
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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)
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Kochite Classification
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Dana Class: |
56.2.4.17 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O |
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(56.2)with cations in [4] and/or >[4] coordination |
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(56.2.4)Cuspidine - Wohlerite group |
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56.2.4.1 Baghdadite Ca3(Zr,Ti)Si2O9 P 21/a 2/m |
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56.2.4.2 Burpalite Na2CaZrSi2O7F2 P 21/a 2/m |
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56.2.4.3 Cuspidine Ca4Si2O7(F,OH)2 P 21/c 2/m |
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56.2.4.4 Lavenite (Na,Ca)2(Mn,Fe)(Zr,Ti,Nb)Si2O7(O,OH,F) P 21/a 2/m |
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56.2.4.5 Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P 21/m 2/m |
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56.2.4.6 Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m |
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56.2.4.7 Hiortdahlite (Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2 P1 1 |
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56.2.4.8 Rosenbuschite (Ca,Na)3(Zr,Ti)Si2O8F P1 1 |
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56.2.4.9 Hainite Na4Ca8(Ti,Zr,Mn,Fe)3Si8O28F8 P1 1 |
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56.2.4.10 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P 21/n 2/m |
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56.2.4.11 Jennite Ca9Si6O18(OH)6ˇ8H2O P1 1 |
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56.2.4.12 Komarovite (Ca,Mn)2(Nb,Ti)2Si2O7(O,F)2ˇ3.5(H2O) Unk Ortho |
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56.2.4.13 Na-komarovite? Na6CaNb6[Si4O12F2ˇ4(H2O) C mmm 2/m 2/m 2/m |
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56.2.4.14 Suolunite Ca2Si2O5(OH)2ˇ(H2O) F dd2 mm2 |
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56.2.4.15 Mongolite Ca4Nb6Si5O24(OH)10ˇ5(H2O) Unk Tetra |
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56.2.4.16 Kristiansenite! Ca2ScSn(Si2O7)(Si2O6OH) C1 1 |
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56.2.4.17 Kochite ! Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4 P1 1 |
Strunz Class: |
VIII/C.12-55 VIII - Silicates |
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VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F] |
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VIII/C.12 - Götzenite - Nacareniobsite-(Ce) series |
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VIII/C.12-10 Mosandrite Na(Na,Ca)2(Ca,Ce,Y)4(Ti,Nb,Zr)(Si2O7)2(O,F)2F3 P 21 2 |
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VIII/C.12-20 Rinkite! Na(Na,Ca)2(Ca,Ce)4(Ti,Nb)(Si2O7)2(O,F)2 P 21 2 |
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VIII/C.12-30 Nacareniobsite-(Ce) NbNa3Ca3(Ce,La)(Si2O7)2OF3 P 21/a 2/m |
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VIII/C.12-40 Rosenbuschite (Ca,Na)3(Zr,Ti)Si2O8F P1 1 |
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VIII/C.12-50 Gotzenite (Ca,Na)3(Ti,Al)Si2O7(F,OH)2 P1 1 |
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VIII/C.12-55 Kochite Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4 P1 1 |
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VIII/C.12-60 Hainite Na4Ca8(Ti,Zr,Mn,Fe)3Si8O28F8 P1 1 |
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Other Kochite Information
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References: |
NAME( AmMin, 88:230) PHYS. PROP.(AmMin, 88:230) OPTIC PROP.(AmMin, 88:230) |
See Also: |
Links to other databases for Kochite :
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 Kochite Specimen Label here :
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Kochite
Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4
Dana No: 56.2.4.17 Strunz No: VIII/C.12-55
Locality:
Notes:
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