Beraunite Mineral Data

General Beraunite Information

Chemical Formula:

Fe++Fe+++5(PO4)4(OH)5•4(H2O)

Composition:

Molecular Weight = 872.07 gm

Iron 38.42 % Fe 8.24 % FeO / 45.78 % Fe₂O₃

Phosphorus 14.21 % P 32.55 % P₂O₅

Hydrogen 1.50 % H 13.43 % H₂O

Oxygen 45.87 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺Fe³⁺₅(PO₄)₄(OH)₅•4(H₂O)

Environment:

A component of bog iron ores; a cement in clays, sands, and bone material; an alteration product of triphylite in granite pegmatites.

IMA Status:

Valid Species (Pre-IMA) 1841

Locality:

Many localities are known; some with well-studied material include: in the Hrbek mine, Svata Dobrotiva (St. Benigna), near Beroun, Czech Republic. In Germany, from the Eleonore and Rot Link to MinDat.org Location Data.

Name Origin:

For its occurrence near Beroun (formerly Beraun), Czech Republic.

Name Pronunciation:

Beraunite + Pronunciation

Synonym:

ICSD 203096

Oxyberaunite

PDF 22-631

Beraunite Image

Images:

Beraunite

Comments: Green and reddish brown, beraunite aggregates.
Location: Arean Claim, Three Oak Gap, Mena, Polk County, Arkansas, USA. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Beraunite Crystallography

Axial Ratios:

a:b:c =4.0253:1:3.7459

Cell Dimensions:

a = 20.646, b = 5.129, c = 19.213, Z = 4; beta = 93.34° V = 2,031.07 Den(Calc)= 2.85

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 10.37(1), 3.082(0.6), 4.825(0.6),

Forms:

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Forms: ( 1 1 1) ( 1 0 0) ( 0 0 1)

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Crystal Structure:

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Marzoni Fecia di Cossato Y , Orlandi P , Pasero M , The Canadian Mineralogist , 27 (1989) p.441-446, Manganese-bearing beraunite from Mangualde, Portugal: mineral data, and structure refinement, Locality: Mangualde, Portugal

Physical Properties of Beraunite

Cleavage:

{100} Good

Color:

Green, Greenish brown, Gray green, Dark greenish brown, Dark red.

Density:

2.9

Diaphaneity:

Translucent

Habit:

Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.

Habit:

Globular - Spherical, or nearly so, rounded forms (e.g. wavellite).

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

2 - Gypsum

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Dull

Streak:

green brown

Optical Properties of Beraunite

Gladstone-Dale:

CI meas= -0.031 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.049 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2779,KPDmeas= 0.2731,KC= 0.2649
Ncalc = 1.76 - 1.77

Optical Data:

Biaxial (+), a=1.775, b=1.786, g=1.815, bire=0.0400, 2V(Calc)=66, 2V(Meas)=30-60. Dispersion relatively weak.

Calculated Properties of Beraunite

Electron Density:

Bulk Density (Electron Density)=2.85 gm/cc
note: Specific Gravity of Beraunite =2.90 gm/cc.

Fermion Index:

Fermion Index = 0.0083682919
Boson Index = 0.9916317081

Photoelectric:

PE_Beraunite= 12.09 barns/electron
U=PE_Beraunite x rElectron Density= 34.50 barns/cc.

Radioactivity:

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

Beraunite Classification

Dana Class:

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

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.16)Dana Group

42.11.16.01 Beraunite FeFe5(PO4)4(OH)5•4(H2O) C 2/c 2/m

Strunz Class:

08.DC.27 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DC -With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1

08.DC.27 Beraunite FeFe5(PO4)4(OH)5•4(H2O) C 2/c 2/m

Other Beraunite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

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

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

Beraunite

Fe++Fe+++5(PO4)4(OH)5•4(H2O)
Dana No: 42.11.16.01 Strunz No: 08.DC.27
Locality:

Notes: