Bergenite Mineral Data

General Bergenite Information

Chemical Formula:

Ca2Ba4[(UO3)2O2(PO4)2]3 (H2O)16

Composition:

Molecular Weight = 3,299.70 gm

Barium 16.65 % Ba 18.59 % BaO

Calcium 2.43 % Ca 3.40 % CaO

Uranium 43.28 % U 52.01 % UO₃

Phosphorus 5.63 % P 12.91 % P₂O₅

Hydrogen 0.98 % H 8.74 % H₂O

Oxygen 31.03 % O

______ ______

100.00 % 95.64 % = TOTAL OXIDE

Empirical Formula:

Ca₂Ba₄3(UO₃)₂3(O₂)3(PO₄)₂(H₂O)₁₆

Environment:

Secondary uranium phosphate mineral.

IMA Status:

Approved IMA 1959

Locality:

Mine dump at Streuberg, Bergen, Saxony, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Bergenite + Pronunciation

Bergenite Image

Images:

Bergenite

Comments: Yellow bladed bergenite crystals.
Location: Mechelserrun, Saxony, Germany. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Bergenite

Comments: Bladed, radial aggregates of yellow bergenite crystals on matrix.
Location: Bergen, Falkenstein, Vogtland, Saxony, Germany. Scale: Picture size 2.5 mm.
© Paul M. Schumacher

Bergenite Crystallography

Axial Ratios:

a:b:c =0.5852:1:1.0063

Cell Dimensions:

a = 10.092, b = 17.245, c = 17.355, Z = 2; beta = 113.678° V = 2,766.14 Den(Calc)= 3.96

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 7.73(1), 3.837(0.8), 3.054(0.6),

Physical Properties of Bergenite

Cleavage:

{???} Perfect

Color:

Yellow, Greenish yellow.

Density:

4.1

Diaphaneity:

Semitransparent

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2-3 - Gypsum-Calcite

Luminescence:

Fluorescent, Short UV=pale orange brown green, Long UV=pale orange brown green.

Streak:

yellow white

Optical Properties of Bergenite

Gladstone-Dale:

CI meas= -0.165 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.206 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1757,KPDmeas= 0.1697,KC= 0.1456
Ncalc = 1.58 - 1.6

Optical Data:

Biaxial (-), a=1.66, b=1.7-1.71, g=1.722, bire=0.0620

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Bergenite

Electron Density:

Bulk Density (Electron Density)=3.60 gm/cc
note: Specific Gravity of Bergenite =4.10 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Bergenite=1,193.91 barns/electron
U=PE_Bergenite x r_electron=4,302.08 barns/cc.

Radioactivity:

GRapi = 3,242,387.44 (Gamma Ray American Petroleum Institute Units)
Concentration of Bergenite per GRapi unit = 308.41 (PPB)

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

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 9.38 ± 2.35 grams of pure Bergenite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 938.09 ±234.52 grams of pure Bergenite .

**Estimated Radioactivity from Bergenite** - very strong
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Bequerols (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 7.75 cm	77,474,733	2.09E-03	3,242,387.44	1,065.99
100 gm / 3.60 cm	7,747,473	2.09E-04	324,238.74	106.60
10 gm / 1.67 cm	774,747	2.09E-05	32,423.87	10.66
1 gm / 7.75 mm	77,475	2.09E-06	3,242.39	1.07
0.1 gm / 3.60 mm	7,747	2.09E-07	324.24	0.11
0.01 gm / 1.67 mm	775	2.09E-08	32.42	0.01
0.001 gm / 0.78 mm	77	2.09E-09	3.24	0.00

Weight of pure Bergenite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.10 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

Bergenite Classification

Dana Class:

42.04.05.03 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.04)where (AB)5 (XO4)2 Zq ï¿½ x(H2O)

(42.04.05)Dumontite Group

42.04.05.01 Dumontite Pb2(UO2)3O2(PO4)2•5(H2O) P 2₁/m 2/m

42.04.05.02 Hugelite Pb2(UO2)3(AsO4)2(OH)4•3(H2O) P 2₁/m 2/m

42.04.05.03 Bergenite Ca2Ba4[(UO3)2O2(PO4)2]3(H2O)16 P 2₁/c 2/m

Strunz Class:

08.EC.40 08 - PHOSPHATES, ARSENATES, VANADATES

08.E - Uranyl Phosphates and Arsenates

08.EC -UO2:RO4 = 3:2

08.EC.40 Bergenite Ca2Ba4[(UO3)2O2(PO4)2]3(H2O)16 P 2₁/c 2/m

Other Bergenite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(AntBidBlaNic4, canmin, v 41, p 91) OPTIC PROP.(AntBidBlaNic4)

See Also:

Links to other databases for Bergenite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - Uranium Minerals

Search for Bergenite using:

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

Visit our Advertisers for Bergenite :

Ask about Bergenite 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 Bergenite Specimen Label here :

Bergenite

Ca2Ba4[(UO3)2O2(PO4)2]3 (H2O)16
Dana No: 42.04.05.03 Strunz No: 08.EC.40
Locality:

Notes:

Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.