Brendelite Mineral Data

General Brendelite Information

Chemical Formula:

(Bi,Pb)2Fe(PO4)(O,OH)3

Composition:

Molecular Weight = 616.49 gm

Iron 9.06 % Fe 11.65 % FeO

Bismuth 43.05 % Bi 48.00 % Bi₂O₃

Phosphorus 5.02 % P 11.51 % P₂O₅

Hydrogen 0.16 % H 1.46 % H₂O

Lead 24.54 % Pb 26.43 % PbO

Oxygen 18.17 % O

______ ______

100.00 % 99.05 % = TOTAL OXIDE

Empirical Formula:

Bi_1.27Pb_0.73Fe²⁺O₂(OH)(PO₄)

Environment:

From the dumps of the ancient (16th century) Guldener Falk silver mine. Chemically related to paulkerrite.

IMA Status:

Approved IMA 1999 (Dana # Added)

Locality:

Near Schneeberg, Saxony, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for Christain Friedrick Brendel (1776-1861), in recognition of his development and application of mechanized mining technology.

Name Pronunciation:

Brendelite + Pronunciation

Synonym:

ICSD 54148

IMA1997-001

Brendelite Image

Images:

Brendelite

Comments: Small brown tabular crystals of brendelite on matrix.
Location: Güldener Falk Mine, Schneeberg, Erzgebirge, Sachsen, Germany. Scale: Picture size 1 mm.
© Thomas Witzke / Abraxas-Verlag

Brendelite Crystallography

Axial Ratios:

a:b:c =3.2183:1:1.8083

Cell Dimensions:

a = 12.278, b = 3.815, c = 6.899, Z = 2; beta = 111.14° V = 301.41 Den(Calc)= 6.79

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 3.011(1), 3.372(0.77), 2.75(0.62),

Physical Properties of Brendelite

Cleavage:

None

Color:

Black, Dark brown.

Density:

6.83

Diaphaneity:

Opaque to translucent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous - Adamantine

Streak:

light brown

Optical Properties of Brendelite

Gladstone-Dale:

CI meas= -0.06 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.066 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1669,KPDmeas= 0.1659,KC= 0.1565
Ncalc = 2.06 - 2.07

Optical Data:

Biaxial (-), a=2.06, b=2.15, g=2.19, bire=0.1300

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Brendelite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	14.69	16.36
420 nm	13.98	15.66
440 nm	13.49	15.22
460 nm	13.13	14.86
480 nm	12.85	14.58
500 nm	12.73	14.48
520 nm	12.60	14.37
540 nm	12.45	14.24
560 nm	12.38	14.14
580 nm	12.28	14.04
600 nm	12.22	13.94
620 nm	12.15	13.85
640 nm	12.10	13.77
660 nm	12.06	13.69
680 nm	11.96	13.61
700 nm	12.03	13.61

**Calculated Relative Intensity Colors of Brendelite in Air**
Relative Intensity	0%	80%	100%	160%	240%	320%	400%	480%	560%	640%	710%
R₁
R₂

Calculated Properties of Brendelite

Electron Density:

Bulk Density (Electron Density)=5.83 gm/cc
note: Specific Gravity of Brendelite =6.83 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

PE_Brendelite=1,255.52 barns/electron
U=PE_Brendelite x rElectron Density=7,324.08 barns/cc.

Radioactivity:

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

Brendelite Classification

Dana Class:

41.03.08.02 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.03)where (A B)3 (XO4) Zq

(41.03.08)Dana Group

41.03.08.01 Paulkellerite Bi2Fe(PO4)O2(OH)2 C 2/c 2/m

41.03.08.02 Brendelite! (Bi,Pb)2Fe(PO4)(O,OH)3 C 2/m 2/m

Strunz Class:

08.BM.15 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BM -With medium-sized and large cations, (OH, etc.):RO4 = 4:1

08.BM.15 Brendelite! (Bi,Pb)2Fe(PO4)(O,OH)3 C 2/m 2/m

Other Brendelite Information

References:

NAME( AmMin, Vol. 84, No. 7-8) PHYS. PROP.(Eur. J. Min.,Vol.10,1998) OPTIC PROP.(AntBidBlaNic4)

See Also:

Links to other databases for Brendelite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Brendelite

(Bi,Pb)2Fe(PO4)(O,OH)3
Dana No: 41.03.08.02 Strunz No: 08.BM.15
Locality:

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