Mineralogy Database

Elpidite Mineral Data

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General Elpidite Information

Help on Chemical  Formula: Chemical Formula: Na2ZrSi6O15•3(H2O)
Help on Composition: Composition: Molecular Weight = 599.75 gm
   Sodium      7.67 %  Na   10.33 % Na2O
   Zirconium  15.21 %  Zr   20.55 % ZrO2
   Silicon    28.10 %  Si   60.11 % SiO2
   Hydrogen    1.01 %  H     9.01 % H2O
   Oxygen     48.02 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na2ZrSi6O15•3(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1894
Help on Locality: Locality: Narsarsuk in the Julianehaab district, southern Greenland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek "ELPIS" = hope, in allusion to the hope of finding another mineral in the layer
Help on Name Pronunciation: Name Pronunciation: Elpidite Say ELPIDITE
Help on Synonym: Synonym: ICSD 10277
  PDF 29-1294

Elpidite Image

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Comments: Blocky, intergrown crystals of elpidite.
Location: Narsasuk, Greenland. Scale: Crystal size 2 cm.
© John Veevaert

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  Gjerdingenite-Mn   Elpidite

Comments: Golden brown crystal of gjerdingenite-Mn, in white elpidite.
Location: Gjerdingselva (Gjerdingen), Nordmarka, Lunner, Oppland, Norway. Scale: Crystal Size 0.02 cm.
© Jeff Weissman / Photographic Guide to Mineral Species

Elpidite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5102:1:0.4916
Help on Cell Dimensions: Cell Dimensions: a = 7.297, b = 14.302, c = 7.032, Z = 2; V = 733.87 Den(Calc)= 2.71
Help on Crystal System: Crystal System: Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: Pb21m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.24(1), 7.08(1), 5.11(0.8),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 0 1 0) ( 1 1 0) ( 0 1 1)

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Physical Properties of Elpidite

Help on Cleavage: Cleavage: {???} Perfect, {???} Perfect
Help on Color: Color: Brown, Colorless, Yellow brown, White, Light red.
Help on Density: Density: 2.54
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Hardness: Hardness: 7 - Quartz
Help on Luminescence: Luminescence: Fluorescent, Short UV=yellow-green, Long UV=yellow-green.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Elpidite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.131 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.06 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2317,KPDmeas= 0.2472,KC= 0.2187
Ncalc = 1.56 - 1.59
Help on Optical Data: Optical Data: Biaxial (+), a=1.56, b=1.65, g=1.674, bire=0.1140
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.

Calculated Properties of Elpidite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.67 gm/cc
note: Specific Gravity of Elpidite =2.71 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEElpidite = 21.04 barns/electron
U=PEElpidite x rElectron Density= 56.29 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Elpidite is Not Radioactive

Elpidite Classification

Help on  Dana Class: Dana Class: (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
  (72.05)with corrugated and complex layers
  (72.05.04)Elpidite/armstrongite Armstrongite CaZrSi6O15•3(H2O) C 2 2 Elpidite Na2ZrSi6O15•3(H2O) Pb21m mm2
Help on  Strunz Class: Strunz Class: 09.DG.65 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DG -Inosilicates with 3-periodic single and multiple chains
09.DG.65 Elpidite Na2ZrSi6O15•3(H2O) Pb21m mm2

Other Elpidite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(www.saint-hilaire.ca) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Elpidite :
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

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Dana No: Strunz No: 09.DG.65





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