Ewaldite Mineral Data (original) (raw)
General Ewaldite Information
(Ba,Sr)(Ca,Na,Y,Ce)(CO3)2
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
Ba0.75Sr0.25Ca0.5Na0.3Y0.1Ce0.1(CO3)2
Eocene-aged lacustrine deposits.
Approved IMA 1971
Green River Formation, Sweetwater County, Wyoming, USA. Link to MinDat.org Location Data.
Named for Paul P. Ewald (1888-1985), German crystallographer, founder of Acta Crystallographica, and professor at Brooklyn Polytechnical Institute, New, York.
ICSD 27421
PDF 46-1453
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Ewaldite Crystallography
a:c = 1:2.41387
a = 5.318, c = 12.837, Z = 2; V = 314.41 Den(Calc)= 3.11
Hexagonal - Dihexagonal PyramidalH-M Symbol (6mm) Space Group: P 63mc
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),
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| | 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
None
Bluish green, Greenish gray, White.
3.25
Transparent
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
white
Optical Properties of Ewaldite
pale yellow green.
dark blue green.
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
Uniaxial (-), e=1.572, w=1.646, bire=0.0740.
Calculated Properties of Ewaldite
Bulk Density (Electron Density)=2.97 gm/cc
note: Specific Gravity of Ewaldite =3.25 gm/cc.
Fermion Index = 0.06
Boson Index = 0.94
PEEwaldite = 191.06 barns/electron
U=PEEwaldite x relectron= 566.67 barns/cc.
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
SpecimenSizeWeight/Volume(Sphere) * | CalculatedActivityBecquerels(Bq) | CalculatedActivityCuries (Ci) | EstimatedActivityGR(api) | EstimatedExposure(mRem**)/hrIf Held in HandFor 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
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
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
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
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
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Ask about Ewaldite here :
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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: