Revdite Mineral Data

General Revdite Information

Chemical Formula:

Na2Si2O5•5(H2O)

Composition:

Molecular Weight = 272.22 gm

Sodium 16.89 % Na 22.77 % Na₂O

Silicon 20.63 % Si 44.14 % SiO₂

Hydrogen 3.70 % H 33.09 % H₂O

Oxygen 58.77 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂(Si₂O₅)•5(H₂O)

Environment:

In ussingite veinlets cutting nepheline syenites in a differentiated alkalic massif.

IMA Status:

Approved IMA 1980

Locality:

From Mt. Karnasurt, Lovozero massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

For Revda, a town near Mt. Karnasurt, on which the mineral occurs.

Name Pronunciation:

Revdite

Synonym:

ICSD 39603

PDF 33-1279

Revdite Image

Images:

Revdite

Comments: Transparent crystal fragment of revdite photographed through a capsule.
Location: Mt. Alluaiv, Lovozero, Kola, Russia. Scale: Not Given.
© Diederik Visser

Revdite Crystallography

Axial Ratios:

a:b:c =0.5398:1:0.6926

Cell Dimensions:

a = 5.383, b = 9.972, c = 6.907, Z = 2; beta = 96.78° V = 368.17 Den(Calc)= 2.46

Crystal System:

Monoclinic - Sphenoidal H-M Symbol (2) Space Group: C 2

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

By Intensity(I/I_o): 4.46(1), 13.37(0.76), 3.34(0.71),

Physical Properties of Revdite

Cleavage:

{100} Perfect, {010} Perfect

Color:

Colorless, White.

Density:

1.94

Diaphaneity:

Transparent

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

2 - Gypsum

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Revdite

Gladstone-Dale:

CI meas= 0 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.211 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1953,KPDmeas= 0.2476,KC= 0.2476
Ncalc = 1.48 - 1.61

Optical Data:

Biaxial (-), a=1.469, b=1.482, g=1.49, bire=0.0210, 2V(Calc)=74, 2V(Meas)=75.

Calculated Properties of Revdite

Electron Density:

Bulk Density (Electron Density)=2.00 gm/cc
note: Specific Gravity of Revdite =1.94 gm/cc.

Fermion Index:

Fermion Index = 0.0099237957
Boson Index = 0.9900762043

Photoelectric:

PE_Revdite= 1.14 barns/electron
U=PE_Revdite x rElectron Density= 2.28 barns/cc.

Radioactivity:

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

Revdite Classification

Dana Class:

74.03.06.01 (74)Phyllosilicate Modulated Layers

(74.03)with joined strips

(74.03.06)Dana Group

74.03.06.01 Revdite Na2Si2O5•5(H2O) C 2 2

Strunz Class:

09.DM.30 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DM -Inosilicates with 6-periodic single chains

09.DM.30 Revdite Na2Si2O5•5(H2O) C 2 2

Other Revdite Information

References:

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

See Also:

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

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

Revdite

Na2Si2O5•5(H2O)
Dana No: 74.03.06.01 Strunz No: 09.DM.30
Locality:

Notes:

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