Brazilianite Mineral Data

Brazilianite Mineral Data +

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General Brazilianite Information

Chemical Formula:

NaAl3(PO4)2(OH)4

Composition:

Molecular Weight = 361.91 gm

Sodium 6.35 % Na 8.56 % Na₂O

Aluminum 22.37 % Al 42.26 % Al₂O₃

Phosphorus 17.12 % P 39.22 % P₂O₅

Hydrogen 1.11 % H 9.96 % H₂O

Oxygen 53.05 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaAl₃(PO₄)₂(OH)₄

IMA Status:

Valid Species (Pre-IMA) 1945

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named after its first discovery in Brazil.

Synonym:

ICSD 2086

PDF 42-1354

Brazilianite Image

Images:

Brazilianite

Comments: Gemmy brazilianite crystal.
Location: Marcel Telirio mine, Divino das Laranjeiras, Minas Gerais, Brazil. Scale: Size Not Given.
© Fabre Minerals

Brazilianite Crystallography

Axial Ratios:

a:b:c =1.1101:1:0.7003

Cell Dimensions:

a = 11.19, b = 10.08, c = 7.06, Z = 4; beta = 97.367° V = 789.76 Den(Calc)= 3.04

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): 5.05(1), 2.74(0.8), 2.99(0.8),

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Crystal Structure:

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Gatehouse B M , Miskin B K , Acta Crystallographica, Section B , 30 (1974) p.1311-1317, The crystal structure of brazilianite, NaAl3(PO4)2(OH)4, Locality: Corrego Frio pegmatite, Minas Gerais, Brazil

Physical Properties of Brazilianite

Cleavage:

[010] Good

Color:

Colorless, Greenish yellow, Yellow green, Light yellow.

Density:

2.98

Diaphaniety:

Transparent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

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

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

5.5 - Knife Blade

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Brazilianite

Gladstone-Dale:

CI meas= 0.021 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.04 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.201,KPDmeas= 0.205,KC= 0.2094

Optical Data:

Biaxial (+), a=1.602, b=1.609, g=1.621-1.623, bire=0.0190-0.0210, 2V(Calc)=72-76, 2V(Meas)=71-75.

Calculated Properties of Brazilianite

Electron Density:

r_electron=2.96 gm/cc
note: r_Brazilianite=2.98 gm/cc.

Fermion Index

Fermion Index = 0.00025
Boson Index = 0.99975

Photoelectric:

PE_Brazilianite= 1.59 barns/electron
U=PE_Brazilianite x r_electron= 4.72 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Brazilianite is Not Radioactive

Brazilianite Classification

Dana Class:

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

(41.5)where (A B)2 (XO4) Zq

(41.5.7)Dana Group

41.5.7.1 Brazilianite NaAl3(PO4)2(OH)4 P 2₁/n 2/m

Strunz Class:

VII/B.12-10 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds

VII/B.12 - Pseudomalachite group, Brazilianite - Viitaniemiite series

VII/B.12-10 Brazilianite NaAl3(PO4)2(OH)4 P 2₁/n 2/m

VII/B.12-20 Augelite Al2(PO4)(OH)3 C 2/m 2/m

VII/B.12-30 Viitaniemiite Na(Ca,Mn)Al(PO4)(F,OH)3 P 2₁,P 2₁/m Mono

Other Brazilianite Information

References:

NAME( Duda&Rejl90) 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 Brazilianite Specimen Label here :

Brazilianite

NaAl3(PO4)2(OH)4
Dana No: 41.5.7.1 Strunz No: VII/B.12-10
Locality:

Notes: