Revdite Mineral Data
General Revdite Information
Chemical Formula:
Na2Si2O5•5(H2O)
Composition:
Molecular Weight = 272.22 gm
Sodium 16.89 % Na 22.77 % Na2 O
Silicon 20.63 % Si 44.14 % SiO2
Hydrogen 3.70 % H 33.09 % H2 O
Oxygen 58.77 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Na2 (Si2 O5 )•5(H2 O)
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
X Ray Diffraction:
By Intensity(I/Io ): 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:
PERevdite = 1.14 barns/electronU=PERevdite x r Electron 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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