Raite Mineral Data

General Raite Information

Chemical Formula:

Na4Mn++4Si8(O,OH)24•9(H2O)

Composition:

Molecular Weight = 1,052.54 gm

Sodium 8.74 % Na 11.78 % Na₂O

Manganese 20.88 % Mn 26.96 % MnO

Silicon 21.35 % Si 45.67 % SiO₂

Hydrogen 1.92 % H 17.12 % H₂O

Oxygen 47.12 % O

______ ______

100.00 % 101.52 % = TOTAL OXIDE

Empirical Formula:

Na₄Mn²⁺₄Si₈O₂₀(OH)₂•9(H₂O)

Environment:

On the walls of fractures Filled with nepheline in alkalic pegmatite in a differentiated alkalic massif (Lovozero massif, Russia).

IMA Status:

Approved IMA 1973

Locality:

From the Jubilee pegmatite, on Mt. Karnasurt, near the valley of the Ilmajok River, Lovozero massif, and in the Khibiny massif, Kola Peninsula, Russia. At Mont Saint-Hilaire, Quebec, C Link to MinDat.org Location Data.

Name Origin:

Named in honor of the international group of scientists, captained by Thor Heyerdahl, crewing the papyrus ship Ra (1969-1970).

Name Pronunciation:

Raite

Synonym:

ICSD 85315

PDF 25-1318

Raite Image

Images:

Raite

Comments: Golden raite crystals up to 2 mm long filling cavities in white microcline with minor lomonosovite and natrolite.
Location: Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: 7x4x3 cm.
© John Betts - Fine Minerals

Images:

Raite Mountainite

Comments: Bright white fibrous acicular mountainite crystal aggregate with pale golden raite.
Location: Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Raite Crystallography

Axial Ratios:

a:b:c =5.7325:1:3.4274

Cell Dimensions:

a = 30.44, b = 5.31, c = 18.2, Z = 4; V = 2,941.78 Den(Calc)= 2.38

Crystal System:

Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: C 222

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

By Intensity(I/I_o): 2.64(1), 2.939(1), 11.4(1),

Crystal Structure:

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Pushcharovsky D Y , Pekov I V , Pluth J J , Smith J V , Ferraris G , Vinogradova S A , Arakcheeva A V , Soboleva S V , Semenov E I , Crystallography Reports , 44 (1999) p.565-574, Raite, manganonordite-(Ce), and ferronordite-(Ce) from the Lovozero massif:, Crystal structures and mineralogical geochemistry, Locality: Yubileinaya pegmatite, Karnasurt Mountain, Lovozero Massif,, Kola Peninsula, Russia

Physical Properties of Raite

Cleavage:

{100} Perfect, {010} Perfect, {001} Perfect

Color:

Brown, Violet red, Golden yellow, Reddish brown.

Density:

2.32 - 2.39, Average = 2.35

Diaphaneity:

Semitransparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Acicular - Occurs as needle-like crystals.

Hardness:

3 - Calcite

Luster:

Vitreous - Silky

Streak:

yellow

Optical Properties of Raite

Gladstone-Dale:

CI meas= -0.01 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2286,KPDmeas= 0.231,KC= 0.2287
Ncalc = 1.53 - 1.55

Optical Data:

Biaxial (-), a=1.54, b=1.542, g=1.55, bire=0.0100, 2V(Calc)=54, 2V(Meas)=53.

Calculated Properties of Raite

Electron Density:

Bulk Density (Electron Density)=2.37 gm/cc
note: Specific Gravity of Raite =2.38 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Raite= 6.19 barns/electron
U=PE_Raite x rElectron Density= 14.66 barns/cc.

Radioactivity:

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

Raite Classification

Dana Class:

78.05.08.01 (78)Unclassified silicates

(78.05)possible phyllosilicates

(78.05.08)Dana Group

78.05.08.01 Raite Na4Mn4Si8(O,OH)24•9(H2O) C 222 2 2 2

Strunz Class:

09.EE.55 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EE -Single tetrahedral nets of 6-membered rings

09.EE.55 Raite Na4Mn4Si8(O,OH)24•9(H2O) C 222 2 2 2

Other Raite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Raite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - EUROmin Project
7 - Ecole des Mines de Paris
8 - GeoScienceWorld
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info
18 - WWW-MINCRYST

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

Raite

Na4Mn++4Si8(O,OH)24•9(H2O)
Dana No: 78.05.08.01 Strunz No: 09.EE.55
Locality:

Notes: