Moraesite Mineral Data

Moraesite Mineral Data +

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General Moraesite Information

Chemical Formula:

Be2(PO4)(OH)·4(H2O)

Composition:

Molecular Weight = 202.06 gm

Beryllium 8.92 % Be 24.76 % BeO

Phosphorus 15.33 % P 35.12 % P₂O₅

Hydrogen 4.49 % H 40.12 % H₂O

Oxygen 71.26 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Be₂(PO₄)(OH)·4(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1953

Locality:

Sapucaia pegmatite, Gelileia, Minas Gerias, Brazil. Link to MinDat.org Location Data.

Name Origin:

Named for Liciano Jacques de Moraes (1896-1968), Brazilian geologist and mineral collector.

Synonym:

ICSD 36587

PDF 29-1257

Moraesite Image

Images:

Moraesite

Comments: Silky, tufted crystals of white moraesite on matrix.
Location: Divino das Laranjeiras, Minas Gerais, Brazil. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Moraesite Glucine

Comments: Light brown glucine with white moraesite.
Location: Boevskoye Mine, Sverdlovsk District, Middle Urals, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Moraesite Crystallography

Axial Ratios:

a:b:c =0.6942:1:0.5808

Cell Dimensions:

a = 8.553, b = 12.319, c = 7.155, Z = 4; beta = 97.93° V = 746.67 Den(Calc)= 1.80

Crystal System:

MonoclinicSpace Group: Cc,C 2/c

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

By Intensity(I/I_o): 7(1), 3.278(0.9), 4.24(0.6),

Physical Properties of Moraesite

Cleavage:

[010] Perfect

Color:

White.

Density:

1.805

Diaphaniety:

Translucent

Habit:

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

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Spherical - Spherical, rounded aggregates.

Streak:

white

Optical Properties of Moraesite

Gladstone-Dale:

CI meas= -0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2656,KPDmeas= 0.2648,KC= 0.2601

Optical Data:

Biaxial (-), a=1.462, b=1.482, g=1.49, bire=0.0280, 2V(Calc)=62, 2V(Meas)=65.

Calculated Properties of Moraesite

Electron Density:

r_electron=1.86 gm/cc
note: r_Moraesite=1.81 gm/cc.

Fermion Index

Fermion Index = 0.08954
Boson Index = 0.91046

Photoelectric:

PE_Moraesite= 0.93 barns/electron
U=PE_Moraesite x r_electron= 1.73 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Moraesite is Not Radioactive

Moraesite Classification

Dana Class:

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

(42.6)where (AB)2 (XO4) Zq · x(H2O)

(42.6.1)Dana Group

42.6.1.1 Moraesite Be2(PO4)(OH)·4(H2O) Cc,C 2/c Mono

42.6.1.2 Bearsite Be2(AsO4)(OH)·4(H2O) Cc or C 2/c Mono

Strunz Class:

VII/D.01-10 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, mostly cations of small size: Be, Li

VII/D.01 - Moraesite - Uralolite - Roscherite series

VII/D.01-10 Moraesite Be2(PO4)(OH)·4(H2O) Cc,C 2/c Mono

VII/D.01-20 Bearsite Be2(AsO4)(OH)·4(H2O) Cc or C 2/c Mono

VII/D.01-30 Glucine CaBe4(PO4)2(OH)4·0.5(H2O) ? Mono

VII/D.01-35 Weinebeneite CaBe3(PO4)2(OH)2·5(H2O) Cc m

VII/D.01-40 Uralolite Ca2Be4(PO4)3(OH)3·5(H2O) P 2₁/n 2/m

VII/D.01-50 Zanazziite Ca2(Mg,Fe)(Mg,Fe,Al,Mn,Fe)4Be4(PO4)6(OH)4·6(H2O) C 2/c 2/m

VII/D.01-55 Greifensteinite! Ca2Be4(Fe,Mn)5(PO4)6(OH)4·6(H2O) C 2/c 2/m

VII/D.01-60 Roscherite Ca(Mn,Fe)5Be4(PO4)6(OH)4·6(H2O) C1 1

Other Moraesite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Moraesite

Be2(PO4)(OH)·4(H2O)
Dana No: 42.6.1.1 Strunz No: VII/D.01-10
Locality:

Notes: