Arctite Mineral Data

General Arctite Information

Chemical Formula:

Na2Ca4(PO4)3F

Composition:

Molecular Weight = 510.20 gm

Sodium 9.01 % Na 12.15 % Na₂O

Calcium 31.42 % Ca 43.96 % CaO

Phosphorus 18.21 % P 41.73 % P₂O₅

Oxygen 37.63 % O

Fluorine 3.72 % F 3.72 % F

- % F -1.57 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂Ca₄(PO₄)₃F

Environment:

Found in a drill core.

IMA Status:

Approved IMA 1981

Locality:

Drill core from the valley of the Vounnimi River, Khibina alkalic massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the arctic region where it was found.

Name Pronunciation:

Arctite

Synonym:

ICSD 20649

PDF 33-1228

Arctite Image

Images:

Arctite

Comments: Clear glassy crystalline arctite with magenta villiaumite in pegmatite.
Location: Vuonnemiok River, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Arctite Crystallography

Axial Ratios:

a:c = 1:5.82127

Cell Dimensions:

a = 7.078, c = 41.203, Z = 6; V = 1,787.64 Den(Calc)= 2.84

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 2.746(1), 3.43(0.32), 13.8(0.25),

Crystal Structure:

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Sokolova E V , Yamnova N A , Egorov-Tismenko Yu K , Khomyakov A P , Doklady Akademii Nauk SSSR , 274 (1984) p.78-83, The crystal structure of a new phosphate of Na,Ca and Ba: (Na5Ca)Ca6Ba(PO4)6F3

Physical Properties of Arctite

Cleavage:

{001} Perfect

Color:

Colorless.

Density:

3.11 - 3.13, Average = 3.12

Diaphaneity:

Transparent

Hardness:

5 - Apatite

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Arctite

Gladstone-Dale:

CI meas= 0.044 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.051 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2033,KPDmeas= 0.1851,KC= 0.1935
Ncalc = 1.55 - 1.61

Optical Data:

Uniaxial (-), e=1.577, w=1.578, bire=0.0010.

Calculated Properties of Arctite

Electron Density:

Bulk Density (Electron Density)=3.08 gm/cc
note: Specific Gravity of Arctite =3.12 gm/cc.

Fermion Index:

Fermion Index = 0.0006048124
Boson Index = 0.9993951876

Photoelectric:

PE_Arctite= 4.91 barns/electron
U=PE_Arctite x rElectron Density= 15.14 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Arctite is Not Radioactive

Arctite Classification

Dana Class:

41.05.18.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.05)where (A B)2 (XO4) Zq

(41.05.18)Dana Group

41.05.18.01 Arctite Na2Ca4(PO4)3F R 3m 3 2/m

Strunz Class:

08.BN.10 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BN -With only large cations, (OH, etc.):RO4 = 0.33:1

08.BN.10 Arctite Na2Ca4(PO4)3F R 3m 3 2/m

Other Arctite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Arctite :
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
15 - WWW-MINCRYST

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Ask about Arctite here :
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Print or Cut-and-Paste your Arctite Specimen Label here :

Arctite

Na2Ca4(PO4)3F
Dana No: 41.05.18.01 Strunz No: 08.BN.10
Locality:

Notes: