Khanneshite Mineral Data

Khanneshite Mineral Data +

General Khanneshite Information

Chemical Formula:

(NaCa)3(Ba,Sr,Ce,Ca)3(CO3)5

Composition:

Molecular Weight = 613.02 gm

Barium 22.40 % Ba 25.01 % BaO

Sodium 8.44 % Na 11.37 % Na₂O

Strontium 7.15 % Sr 8.45 % SrO

Calcium 6.21 % Ca 8.69 % CaO

Cerium 6.86 % Ce 8.03 % Ce₂O₃

Carbon 9.80 % C 35.90 % CO₂

Oxygen 39.15 % O

______ ______

100.00 % 97.46 % = TOTAL OXIDE

Empirical Formula:

Na_2.25Ca_0.75BaSr_0.5Ce_0.3Ca_0.2(CO₃)₅

IMA Status:

Approved IMA 1982

Locality:

Link to MinDat.org Location Data.

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Khanneshite Crystallography

Axial Ratios:

a:c = 1:0.61784

Cell Dimensions:

a = 10.65, c = 6.58, Z = 2; V = 646.33 Den(Calc)= 3.15

Crystal System:

Hexagonal - Dihexagonal PyramidalH-M Symbol (6mm) Space Group: P 6₃mc

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

By Intensity(I/I_o): 2.66(1), 3.08(0.62), 2.19(0.55),

Physical Properties of Khanneshite

Cleavage:

[???] Indistinct

Color:

Light yellow.

Density:

3.8 - 3.9, Average = 3.84

Diaphaniety:

Transparent

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Khanneshite

Gladstone-Dale:

CI meas= 0.067 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.14 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1954,KPDmeas= 0.1599,KC= 0.1714

Optical Data:

Uniaxial (-), e=1.609-1.61, w=1.62-1.623, bire=0.0110-0.0130.

Calculated Properties of Khanneshite

Electron Density:

r_electron=3.59 gm/cc
note: r_Khanneshite=3.85 gm/cc.

Fermion Index

Fermion Index = 0.04627
Boson Index = 0.95373

Photoelectric:

PE_Khanneshite= 139.27 barns/electron
U=PE_Khanneshite x r_electron= 500.58 barns/cc.

Radioactivity:

GRapi = 6,828.27 (Gamma Ray American Petroleum Institute Units)

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

**Estimated Radioactivity from Khanneshite** - 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 / 7.92 cm	153,596	4.15E-06	6,828.27	2.24
100 gm / 3.67 cm	15,360	4.15E-07	682.83	0.22
10 gm / 1.71 cm	1,536	4.15E-08	68.28	0.02
1 gm / 7.92 mm	154	4.15E-09	6.83	0.00
0.1 gm / 3.67 mm	15	4.15E-10	0.68	0.00
0.01 gm / 1.71 mm	2	4.15E-11	0.07	0.00
0.001 gm / 0.79 mm	0	4.15E-12	0.01	0.00

Weight of pure Khanneshite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.85 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 ( 0.34 % Th) From Sum REE Elements ( 6.86 % REE)

Khanneshite Classification

Dana Class:

14.4.4.2 (14)Anhydrous Carbonates

(14.4)with Compound Formula A+2 B++2 (CO3)4

(14.4.4)Burbankite Group (Hexagonal)

14.4.4.1 Burbankite (Na,Ca)3(Sr,Ba,Ce)3(CO3)5 P 6₃/mmc 6/m 2/m 2/m

14.4.4.2 Khanneshite (NaCa)3(Ba,Sr,Ce,Ca)3(CO3)5 P 6₃mc 6mm

14.4.4.3 Calcioburbankite Na3(Ca,REE,Sr)3(CO3)5 P 6₃mc 6mm

Strunz Class:

V/B.05-110 V - Nitrates, Carbonates and Borates

V/B - Waterfree carbonates [CO3]2- without unfamiliar anions

V/B.05 - Eitelie - Shortite - Carbocernaite series

V/B.05-10 Eitelite Na2Mg(CO3)2 R 3 3

V/B.05-20 Nyerereite Na2Ca(CO3)2 C mc2₁ mm2

V/B.05-30 Natrofairchildite Na2Ca(CO3)2 P 6₃/mmc 6/m 2/m 2/m

V/B.05-40 Gregoryite (Na2,K2,Ca)CO3 P 6₃mc 6mm

V/B.05-50 Fairchildite K2Ca(CO3)2 P 6₃/mmc 6/m 2/m 2/m

V/B.05-55 Zemkorite (Na,K)2Ca(CO3)2 P 6₃/mmc, P 6₃mc, P 6₂c- Hex

V/B.05-60 Butschliite K2Ca(CO3)2 R 3m 3 2/m

V/B.05-70 Shortite Na2Ca2(CO3)3 Amm2 mm2

V/B.05-80 Sahamalite-(Ce) (Mg,Fe)Ce2(CO3)4 P 2₁/a 2/m

V/B.05-90 Remondite-(Ce) Na3(Ce,La,Ca,Na,Sr)3(CO3)5 P 2₁ 2

V/B.05-92 Remondite-(La)! Na3(La,Ce,Ca)3(CO3)5 P 2₁ 2

V/B.05-95 Petersenite-(Ce) (Na,Ca)4(Ce,La,Nd)2(CO3)5 P 2₁ 2

V/B.05-98 Calcioburbankite Na3(Ca,REE,Sr)3(CO3)5 P 6₃mc 6mm

V/B.05-100 Burbankite (Na,Ca)3(Sr,Ba,Ce)3(CO3)5 P 6₃/mmc 6/m 2/m 2/m

V/B.05-110 Khanneshite (NaCa)3(Ba,Sr,Ce,Ca)3(CO3)5 P 6₃mc 6mm

V/B.05-120 Carbocernaite (Ca,Na)(Sr,Ce,Ba)(CO3)2 P mc2₁ mm2

Other Khanneshite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Khanneshite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Khanneshite

(NaCa)3(Ba,Sr,Ce,Ca)3(CO3)5
Dana No: 14.4.4.2 Strunz No: V/B.05-110
Locality:

Notes: