Epididymite Mineral Data

(Translated by https://www.hiragana.jp/)
Epididymite Mineral Data

General Epididymite Information

Chemical Formula:

NaBeSi3O7(OH)

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

Empirical Formula:

NaBe(Si₃O₇)(OH)

IMA Status:

Valid Species (Pre-IMA) 1893

Locality:

Island of Aro, Langesundfiord, Norway. Link to MinDat.org Location Data.

Name Origin:

From the Greek epi, "near" and didymos, "twin", for its dimorphous relationship with eudidymite

Name Pronunciation:

Epididymite + Pronunciation

Synonym:

ICSD 2941

PDF 14-64

Epididymite Image

Images:

Epididymite

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

Images:

Epididymite Eudidymite

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

Axial Ratios:

a:b:c =1.7247:1:1.8365

Cell Dimensions:

a = 12.66, b = 7.34, c = 13.48, Z = 8; V = 1,252.62 Den(Calc)= 2.60

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnam

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

By Intensity(I/I_o): 2.99(1), 3.09(1), 3.4(1),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Robinson P D , Fang J H , American Mineralogist , 55 (1970) p.1541-1549, The crystal structure of epididymite

Physical Properties of Epididymite

Cleavage:

{001} Perfect, {010} Perfect

Color:

Colorless, White, Gray, Yellow, Blue.

Density:

2.55

Diaphaneity:

Transparent to translucent

Fracture:

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

Hardness:

5.5 - Knife Blade

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Epididymite

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

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

Electron Density:

Bulk Density (Electron Density)=2.54 gm/cc
note: Specific Gravity of Epididymite =2.55 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

PE_Epididymite= 1.51 barns/electron
U=PE_Epididymite x rElectron Density= 3.84 barns/cc.

Radioactivity:

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

Epididymite Classification

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

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

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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

Search for Epididymite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Epididymite :

A Bijoux Google Search for Epididymite
Adam's Minerals Google Search for Epididymite
Cape Minerals Google Search for Epididymite
Dakota Matrix Minerals Google Search for Epididymite
Excalibur Mineral Corp. Google Search for Epididymite
Exceptional Minerals Google Search for Epididymite
John Betts Fine Minerals Search for Epididymite
McDougall Minerals Google Search for Epididymite
Mineral News Website Link
Rock and Mineral Shows Google Search for Epididymite
Weinrich Minerals, Inc. Google Search for Epididymite

Ask about Epididymite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Epididymite

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

Notes: