Bjarebyite Mineral Data

General Bjarebyite Information

Chemical Formula:

(Ba,Sr)(Mn++,Fe++,Mg)2Al2(PO4)3(OH)3

Composition:

Molecular Weight = 648.89 gm

Barium 23.28 % Ba 25.99 % BaO

Strontium 1.35 % Sr 1.60 % SrO

Magnesium 0.75 % Mg 1.24 % MgO

Manganese 7.62 % Mn 9.84 % MnO

Aluminum 7.48 % Al 14.14 % Al₂O₃

Iron 7.75 % Fe 9.96 % FeO

Phosphorus 14.32 % P 32.81 % P₂O₅

Hydrogen 0.47 % H 4.16 % H₂O

Oxygen 36.98 % O

______ ______

100.00 % 99.75 % = TOTAL OXIDE

Empirical Formula:

Ba_1.1Sr_0.1Al_1.8Mn²⁺_0.9Fe²⁺_0.9Mg_0.2(PO₄)₃(OH)₃

Environment:

Late-stage reaction product of triphylite and amblygonite in complex granite pegmatites.

IMA Status:

Approved IMA 1973

Locality:

Palermo #1 mine, near North Groton, Grafton County, New Hampshire, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Alfred Gunnar Bjareby (1899-1967), Swedish-American student of New England pegmatite minerals.

Name Pronunciation:

Bjarebyite + Pronunciation

Synonym:

ICSD 6207

PDF 29-171

Bjarebyite Image

Images:

Bjarebyite

Comments: Green, pyramidal crystals of bjarebyite.
Location: Palermo No. 1 mine, North Groton, Grafton County, New Hamphshire, USA. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Bjarebyite Crystallography

Axial Ratios:

a:b:c =0.7396:1:0.4072

Cell Dimensions:

a = 8.93, b = 12.073, c = 4.917, Z = 2; beta = 100.15° V = 521.81 Den(Calc)= 4.13

Crystal System:

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

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

By Intensity(I/I_o): 3.09(1), 2.681(0.7), 8.81(0.7),

Physical Properties of Bjarebyite

Cleavage:

{010} Perfect, {100} Perfect

Color:

Emerald green.

Density:

4.02

Diaphaneity:

Transparent to Translucent

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

4 - Fluorite

Luster:

Subadamantine

Streak:

white

Optical Properties of Bjarebyite

Gladstone-Dale:

CI meas= 0.032 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.058 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1692,KPDmeas= 0.1739,KC= 0.1797
Ncalc = 1.72 - 1.74

Optical Data:

Biaxial (+), a=1.692, b=1.695, g=1.71, bire=0.0180, 2V(Calc)=50, 2V(Meas)=35.

Pleochroism (x):

colorless or pale brownish yellow.

Pleochroism (y):

brownish green.

Pleochroism (z):

olive green or apple green.

Calculated Properties of Bjarebyite

Electron Density:

Bulk Density (Electron Density)=3.78 gm/cc
note: Specific Gravity of Bjarebyite =4.02 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Bjarebyite= 106.11 barns/electron
U=PE_Bjarebyite x rElectron Density= 401.13 barns/cc.

Radioactivity:

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

Bjarebyite Classification

Dana Class:

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

(41.09)where (A B)5 (XO4)3 Zq

(41.09.01)Kulanite Group

41.09.01.01 Kulanite Ba(Fe,Mn,Mg)2Al2(PO4)3(OH)3 P 2₁/m 2/m

41.09.01.02 Penikisite BaMg2Al2(PO4)3(OH)3 P1 1

41.09.01.03 Bjarebyite (Ba,Sr)(Mn,Fe,Mg)2Al2(PO4)3(OH)3 P 2₁/m 2/m

41.09.01.04 Perloffite Ba(Mn,Fe)2Fe2(PO4)3(OH)3 P 2₁/m 2/m

41.09.01.05 Johntomaite! Ba(Fe,Ca,Mn)2Fe2(PO4)3(OH)3 P 2₁/m 2/m

Strunz Class:

08.BH.20 08 - PHOSPHATES, ARSENATES, VANADATES

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

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

08.BH.20 Bjarebyite (Ba,Sr)(Mn,Fe,Mg)2Al2(PO4)3(OH)3 P 2₁/m 2/m

08.BH.20 Kulanite Ba(Fe,Mn,Mg)2Al2(PO4)3(OH)3 P 2₁/m 2/m

08.BH.20 Penikisite BaMg2Al2(PO4)3(OH)3 P1 1

08.BH.20 Perloffite Ba(Mn,Fe)2Fe2(PO4)3(OH)3 P 2₁/m 2/m

08.BH.20 Johntomaite! Ba(Fe,Ca,Mn)2Fe2(PO4)3(OH)3 P 2₁/m 2/m

Other Bjarebyite Information

References:

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

See Also:

Links to other databases for Bjarebyite :
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 - WWW-MINCRYST

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Bjarebyite

(Ba,Sr)(Mn++,Fe++,Mg)2Al2(PO4)3(OH)3
Dana No: 41.09.01.03 Strunz No: 08.BH.20
Locality:

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