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

Environment:

Disseminated in hydrothermally-altered fine-grained carbonatite.

IMA Status:

Approved IMA 1982

Locality:

Khanneshin carbonatite complex, Afghanistan, Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Khanneshite + Pronunciation

Khanneshite Image

Images:

Khanneshite

Comments: Vitreous orange massive khanneshite on single grain.
Location: Tuliylukht Bay, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: See Image.
© Rruff Database

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),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Belovitskaya Y V , Pekov I V , Gobechiya E R , Kabalov Y K , Schneider J , Crystallography Reports , 47 (2002) p.39-42, Determination of the crystal structure of khanneshite by the Rietveld method, Locality: Khibiny massif, Kola Peninsula, Russia

Physical Properties of Khanneshite

Cleavage:

{???} Indistinct

Color:

Light yellow.

Density:

3.8 - 3.9, Average = 3.84

Diaphaneity:

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
Ncalc = 1.54 - 1.67

Optical Data:

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

Calculated Properties of Khanneshite

Electron Density:

Bulk Density (Electron Density)=3.59 gm/cc
note: Specific Gravity of Khanneshite =3.85 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

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)
Concentration of Khanneshite per GRapi unit = 146.45 (PPM)

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 Becquerels (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:

14.04.04.02 (14)Anhydrous Carbonates

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

(14.04.04)Burbankite Group (Hexagonal)

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

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

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

14.04.04.04 Sanromanite! Na2CaPb3(CO3)5 P 6₃mc 6mm

Strunz Class:

05.AC.30 05 - CARBONATES (NITRATES)

05.A - Carbonates without additional anions, without H2O

05.AC -Alkali and alkali-earth carbonates

05.AC.30 Burbankite (Na,Ca)3(Sr,Ba,Ce)3(CO3)5 P 6₃/mmc 6/m 2/m 2/m

05.AC.30 Calcioburbankite Na3(Ca,REE,Sr)3(CO3)5 P 6₃mc 6mm

05.AC.30 Khanneshite (NaCa)3(Ba,Sr,Ce,Ca)3(CO3)5 P 6₃mc 6mm

05.AC.30 Sanromanite! Na2CaPb3(CO3)5 P 6₃mc 6mm

Other Khanneshite Information

References:

NAME( AntBidBlaNic3) 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

Search for Khanneshite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Khanneshite :

A Bijoux Google Search for Khanneshite
Adam's Minerals Google Search for Khanneshite
Cape Minerals Google Search for Khanneshite
Dakota Matrix Minerals Google Search for Khanneshite
Excalibur Mineral Corp. Google Search for Khanneshite
Exceptional Minerals Google Search for Khanneshite
John Betts Fine Minerals Search for Khanneshite
McDougall Minerals Google Search for Khanneshite
Mineral News Website Link
Rock and Mineral Shows Google Search for Khanneshite
Weinrich Minerals, Inc. Google Search for Khanneshite

Ask about Khanneshite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Khanneshite Specimen Label here :

Khanneshite

(NaCa)3(Ba,Sr,Ce,Ca)3(CO3)5
Dana No: 14.04.04.02 Strunz No: 05.AC.30
Locality:

Notes: