Mineralogy Database

Epididymite Mineral Data

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General Epididymite Information

Help on Chemical  Formula: Chemical Formula: NaBeSi3O7(OH)
Help on Composition: Composition: Molecular Weight = 245.26 gm
   Sodium      9.37 %  Na   12.64 % Na2O
   Beryllium   3.67 %  Be   10.20 % BeO
   Silicon    34.35 %  Si   73.49 % SiO2
   Hydrogen    0.41 %  H     3.67 % H2O
   Oxygen     52.19 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: NaBe(Si3O7)(OH)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1893
Help on Locality: Locality: Island of Aro, Langesundfiord, Norway. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek epi, "near" and didymos, "twin", for its dimorphous relationship with eudidymite
Help on Name Pronunciation: Name Pronunciation: Epididymite + Pronunciation Say EPIDIDYMITE
Help on Synonym: Synonym: ICSD 2941
  PDF 14-64
 

Epididymite Image

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  Epididymite

Comments: Trilling twinned crystal of epididymite on matrix.
Location: Mont St. Hilaire, Quebec, Canada. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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  Eudidymite   Epididymite

Comments: Translucent prismatic crystals of eudidymite on white opaque epididymite.
Location: Narsaarsuk, Greenland. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Epididymite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7247:1:1.8365
Help on Cell Dimensions: Cell Dimensions: a = 12.66, b = 7.34, c = 13.48, Z = 8; V = 1,252.62 Den(Calc)= 2.60
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnam
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.99(1), 3.09(1), 3.4(1),
 

Physical Properties of Epididymite

Help on Cleavage: Cleavage: {001} Perfect, {010} Perfect
Help on Color: Color: Colorless, White, Gray, Yellow, Blue.
Help on Density: Density: 2.55
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Epididymite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.001 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2095,KPDmeas= 0.2136,KC= 0.2138
Ncalc = 1.55 - 1.56
Help on Optical Data: Optical Data: Biaxial (+), a=1.544, b=1.544, g=1.546, bire=0.0020, 2V(Calc)=0, 2V(Meas)=22.
 

Calculated Properties of Epididymite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.54 gm/cc
note: Specific Gravity of Epididymite =2.55 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEEpididymite = 1.51 barns/electron
U=PEEpididymite x rElectron Density= 3.84 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Epididymite is Not Radioactive
 

Epididymite Classification

Help on  Dana Class: Dana Class: 66.03.01.04 (66)Inosilicate Double-Width Unbranched Chains, W=2
  (66.03)with chains P>2
  (66.03.01)P=3
 
66.03.01.01 Xonotlite Ca6Si6O17(OH)2 P 2/a 2/m
 
66.03.01.02 Zorite Na6Ti5[Si12O34](O,OH)5•11(H2O) C mmm 2/m 2/m 2/m
 
66.03.01.03 Eudidymite NaBeSi3O7(OH) C 2/c 2/m
 
66.03.01.04 Epididymite NaBeSi3O7(OH) Pnam 2/m 2/m 2/m
 
66.03.01.05 Yuksporite (Sr,Ba)2K4(Ca,Na)14([],Mn,Fe){(Ti,Nb)4(O,OH)4[Si6O17]2[Si2O7]3}(H2O,OH)n,n~3 P 21/m 2/m
 
66.03.01.06 Haineaultite! (Na,Ca)5Ca(Ti,Nb)5(Si,S)12O34(OH,F)8•5(H2O) C 222 2 2 2
 
66.03.01.07 Chivruaiite! Ca4(Ti,Nb)5[(Si6O17)2[(OH,O)5]•13-14H2O C mmm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.DG.55 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DG -Inosilicates with 3-periodic single and multiple chains
 
09.DG.55 Epididymite NaBeSi3O7(OH) Pnam 2/m 2/m 2/m
 

Other Epididymite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Epididymite :
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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Epididymite

NaBeSi3O7(OH)
Dana No: 66.03.01.04 Strunz No: 09.DG.55
Locality:

 

Notes:

 

 
   
 


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