Ewaldite  Mineral Data

Ewaldite Mineral Data

Search Webmineral :
   
Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images Share
      News Help About


General Ewaldite Information

Help on Chemical  Formula: Chemical Formula: (Ba,Sr)(Ca,Na,Y,Ce)(CO3)2
Help on Composition: Composition: Molecular Weight = 294.76 gm
   Barium     34.94 %  Ba   39.01 % BaO
   Sodium      2.34 %  Na    3.15 % Na2O
   Strontium   7.43 %  Sr    8.79 % SrO
   Calcium     6.80 %  Ca    9.51 % CaO
   Cerium      4.75 %  Ce    5.57 % Ce2O3
   Yttrium     3.02 %  Y     3.83 % Y2O3
   Carbon      8.15 %  C    29.86 % CO2
   Oxygen     32.57 %  O
             ______        ______ 
             100.00 %       99.73 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ba0.75Sr0.25Ca0.5Na0.3Y0.1Ce0.1(CO3)2
Help on Environment: Environment: Eocene-aged lacustrine deposits.
Help on IMA Status: IMA Status: Approved IMA 1971
Help on Locality: Locality: Green River Formation, Sweetwater County, Wyoming, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Paul P. Ewald (1888-1985), German crystallographer, founder of Acta Crystallographica, and professor at Brooklyn Polytechnical Institute, New, York.
Help on Name Pronunciation: Name Pronunciation: Ewaldite Say EWALDITE
Help on Synonym: Synonym: ICSD 27421
  PDF 46-1453
 

Search for Ewaldite Images

Click Here To Search Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

  

Ewaldite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.41387
Help on Cell Dimensions: Cell Dimensions: a = 5.318, c = 12.837, Z = 2; V = 314.41 Den(Calc)= 3.11
Help on Crystal System: Crystal System: Hexagonal - Dihexagonal PyramidalH-M Symbol (6mm) Space Group: P 63mc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.39(1), 3.72(0.4), 4.58(0.2),1.714(0.1), 2.44(0.1), 3.2(0.1),
Click Here for Large Ewaldite Structure Window 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


Voloshin A V , Subbotin V V , Yakovenchuk V N , Pakhomovsky Y A , Men shikov Y P , Nadezhina T N , Pushcharovsky D Y , Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva , 1992 (1992) p.56-66, New data on the ewaldite

 

Physical Properties of Ewaldite

Help on Cleavage: Cleavage: None
Help on Color: Color: Bluish green, Greenish gray, White.
Help on Density: Density: 3.25
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Streak: Streak: white
 

Optical Properties of Ewaldite

Help on Dichroism (e): Dichroism (e): pale yellow green.
Help on Dichroism (w): Dichroism (w): dark blue green.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.128 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.178 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1958,KPDmeas= 0.1874,KC= 0.1662
Ncalc = 1.52 - 1.54
Help on Optical Data: Optical Data: Uniaxial (-), e=1.572, w=1.646, bire=0.0740.
 

Calculated Properties of Ewaldite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.97 gm/cc
note: Specific Gravity of Ewaldite =3.25 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEEwaldite = 191.06 barns/electron
U=PEEwaldite x relectron= 566.67 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 4,627.40 (Gamma Ray American Petroleum Institute Units)
Concentration of Ewaldite per GRapi unit = 216.10 (PPM)

Ewaldite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Radioactivity from Ewaldite - mild
Specimen
Size
Weight/Volume
(Sphere)
*
Calculated
Activity
Becquerels
(Bq)
Calculated
Activity
Curies (Ci)
Estimated
Activity
GR(api)
Estimated
Exposure
(mRem**)/hr
If Held in Hand
For One Hour
1000 gm / 8.38 cm 106,480 2.88E-06 4,627.40 1.52
100 gm / 3.89 cm 10,648 2.88E-07 462.74 0.15
10 gm / 1.80 cm 1,065 2.88E-08 46.27 0.02
1 gm / 8.38 mm 106 2.88E-09 4.63 0.00
0.1 gm / 3.89 mm 11 2.88E-10 0.46 0.00
0.01 gm / 1.80 mm 1 2.88E-11 0.05 0.00
0.001 gm / 0.84 mm 0 2.88E-12 0.00 0.00

Weight of pure Ewaldite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.25 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 0.24 % Th) From Sum REE Elements ( 4.75 % REE)
 

Ewaldite Classification

Help on  Dana Class: Dana Class: 14.02.04.01 (14)Anhydrous Carbonates
  (14.02)with Compound Formula A+ B++ (CO3)2
  (14.02.04)Dana Group
 
14.02.04.01 Ewaldite (Ba,Sr)(Ca,Na,Y,Ce)(CO3)2 P 63mc 6mm
Help on  Strunz Class: Strunz Class: 05.CC.45 05 - CARBONATES (NITRATES)
  05.C - Carbonates without Additional Anions, with H2O
  05.CC -With rare-earth elements (REE)
 
05.CC.45 Ewaldite (Ba,Sr)(Ca,Na,Y,Ce)(CO3)2 P 63mc 6mm
 

Other Ewaldite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Ewaldite :
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

Search for Ewaldite using:

Google
 
Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Ewaldite :

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

Ask about Ewaldite 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 Espaņol

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

Ewaldite

(Ba,Sr)(Ca,Na,Y,Ce)(CO3)2
Dana No: 14.02.04.01 Strunz No: 05.CC.45
Locality:

 

Notes: