Beryllonite Mineral Data

Beryllonite Mineral Data +

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General Beryllonite Information

Chemical Formula:

NaBePO4

Composition:

Molecular Weight = 126.97 gm

Sodium 18.11 % Na 24.41 % Na₂O

Beryllium 7.10 % Be 19.70 % BeO

Phosphorus 24.39 % P 55.90 % P₂O₅

Oxygen 50.40 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaBe(PO₄)

Environment:

Occurs as a rare secondary mineral in granitic and alkalic pegmatites.

IMA Status:

Valid Species (Pre-IMA) 1888

Locality:

In the USA, in Maine, found on Sugarloaf Mountain, near Stoneham, at the Dunton quarry and the Bell Pit, Newry, Oxford Co., and other minor occurrences. Link to MinDat.org Location Data.

Name Origin:

For one of the major constituents in the composition, BERYLLium.

Synonym:

ICSD 9271

PDF 33-1213

Beryllonite Image

Images:

Beryllonite

Comments: Clear twinned crystal of beryllonite.
Location: Telecio mine, Linopolis, Minas Gerais, Brazil. Scale: Crystal size 1 cm.
© John Veevaert

Beryllonite Crystallography

Axial Ratios:

a:b:c =1.0476:1:1.826

Cell Dimensions:

a = 8.13, b = 7.76, c = 14.17, Z = 12; beta = 90° V = 893.97 Den(Calc)= 2.83

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

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

By Intensity(I/I_o): 2.84(1), 3.65(0.9), 2.28(0.7),

Crystal Structure:

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Giuseppetti G , Tadini C , Tschermaks Mineralogische und Petrographische Mitteilungen , 20 (1973) p.1-12, Refinment of the crystal structure of beryllonite

Physical Properties of Beryllonite

Cleavage:

[???] Perfect, [???] Good, Perfect

Color:

Colorless, White, Light yellow.

Density:

2.8

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Pearly

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Beryllonite

Gladstone-Dale:

CI meas= -0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1968,KPDmeas= 0.1989,KC= 0.1959

Optical Data:

Biaxial (-), a=1.552, b=1.5579, g=1.561, bire=0.0090

Calculated Properties of Beryllonite

Electron Density:

r_electron=2.76 gm/cc
note: r_Beryllonite=2.83 gm/cc.

Fermion Index

Fermion Index = 0.07121
Boson Index = 0.92879

Photoelectric:

PE_Beryllonite= 1.52 barns/electron
U=PE_Beryllonite x r_electron= 4.19 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Beryllonite is Not Radioactive

Beryllonite Classification

Dana Class:

38.1.5.1 (38)Anhydrous Phosphates, etc

(38.1)A+ B++ XO4

(38.1.5)Dana Group

38.1.5.1 Beryllonite NaBePO4 P 2₁/n 2/m

Strunz Class:

VII/A.01-30 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, cations of small size: Li, Be, Al

VII/A.01 - Berlinite - Beryllonite - Hurlbutite series

VII/A.01-10 Berlinite AlPO4 P 3₁21,P 3₂21 3 2

VII/A.01-12 Alarsite! AlAsO4 P 3₁21,P 3₂21 3 2

VII/A.01-15 Rodolicoite! FePO4 R 3121 3 2

VII/A.01-20 Lithiophosphate Li3PO4 P mn2₁ mm2

VII/A.01-25 Nalipoite NaLi2PO4 Pmnb 2/m 2/m 2/m

VII/A.01-30 Beryllonite NaBePO4 P 2₁/n 2/m

VII/A.01-40 Hurlbutite CaBe2(PO4)2 P 2₁/a 2/m

Other Beryllonite Information

References:

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

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

Beryllonite

NaBePO4
Dana No: 38.1.5.1 Strunz No: VII/A.01-30
Locality:

Notes: