Kochite Mineral Data

General Kochite Information

Chemical Formula:

Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4

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

Empirical Formula:

Na_1.92Sr_0.02Na_2.77Ca_1.23Ca_3.52Na_0.48Mn²⁺_1.07Ca_0.81Y_0.05Ce_0.05La_0.02Zr_1.41Fe²⁺_0.23 Ca_0.35Hf_0.01Ti_1.64Nb_0.22Zr_0.11Al_0.02F_1.57

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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Kochite Crystallography

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

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

By Intensity(I/I_o): 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

Physical Properties of Kochite

Cleavage:

{100} Perfect

Color:

Colorless, Pale brown.

Density:

3.32

Diaphaneity:

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

Optical Properties of Kochite

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

Optical Data:

Biaxial (+), a=1.684, b=1.695, g=1.718, bire=0.0340

Calculated Properties of Kochite

Electron Density:

Bulk Density (Electron Density)=3.22 gm/cc
note: Specific Gravity of Kochite =3.32 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Kochite= 23.77 barns/electron
U=PE_Kochite x r_electron= 76.48 barns/cc.

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 Becquerels (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

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

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

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 - 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: