Eosphorite Mineral Data

Eosphorite Mineral Data +

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General Eosphorite Information

Chemical Formula:

MnAl(PO4)(OH)2·(H2O)

Composition:

Molecular Weight = 228.92 gm

Manganese 24.00 % Mn 30.99 % MnO

Aluminum 11.79 % Al 22.27 % Al₂O₃

Phosphorus 13.53 % P 31.00 % P₂O₅

Hydrogen 1.76 % H 15.74 % H₂O

Oxygen 48.92 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺Al(PO₄)(OH)₂·(H₂O)

Environment:

Granitic pegmatite. Mn-end member of a series with childrenite.

IMA Status:

Valid Species (Pre-IMA) 1878

Locality:

Branchville, Fairfield County, Connecticut, USA. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek for "dawn-bearing," in allusion to the pink color.

Synonym:

ICSD 74292

PDF 36-402

Eosphorite Image

Images:

Eosphorite Zanazziite

Comments: Minor crystals of equant, olive green zanazziite and brown, lath-like crystals of eosphorite on quartz.
Location: Taquaral, Minas Gerais, Brazil. Scale: Picture size 1 cm.
© John Veevaert

Images:

Eosphorite Vivianite

Comments: Bottle-green translucent vivianite crystal (2cm) associated with reddish, micro eosphorite crystals.
Location: Lavra do ?nio pegmatite, Galil?ia, Governador Valadares, Rio Doce, Minas Gerais, Brazil. Scale: 3.5 x 3 x 2 cm..
© Tom Loomis / Dakota Matrix

Eosphorite Crystallography

Axial Ratios:

a:b:c =0.7733:1:0.513

Cell Dimensions:

a = 10.436, b = 13.495, c = 6.923, Z = 8; V = 974.99 Den(Calc)= 3.12

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Bbam

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

By Intensity(I/I_o): 2.81(1), 2.42(0.4), 5.27(0.4),

Forms:

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Crystal Structure:

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Hoyos M A , Calderon T , Vergara I , Garcia-Sole J , Mineralogical Magazine , 57 (1993) p.329-336, New structural and spectroscopic data for eosphorite, Locality: Taquaral, Brazil

Physical Properties of Eosphorite

Cleavage:

[100] Indistinct

Color:

Light pink, Yellow brown, Light brown, Light yellow, Colorless.

Density:

3.06 - 3.1, Average = 3.08

Diaphaniety:

Transparent to Translucent

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Habit:

Massive - Fibrous - Distinctly fibrous fine-grained forms.

Habit:

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

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

5 - Apatite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Resinous

Streak:

white

Optical Properties of Eosphorite

Gladstone-Dale:

CI meas= 0.027 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.04 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2087,KPDmeas= 0.2114,KC= 0.2174

Optical Data:

Biaxial (-), a=1.628-1.639, b=1.648-1.664, g=1.657-1.671, bire=0.0290-0.0320, 2V(Calc)=54-66, 2V(Meas)=50. Dispersion strong, r < v.

Pleochroism (x):

yellow.

Pleochroism (y):

pink.

Pleochroism (z):

pale pink.

Calculated Properties of Eosphorite

Electron Density:

r_electron=3.04 gm/cc
note: r_Eosphorite=3.08 gm/cc.

Fermion Index

Fermion Index = 0.00023
Boson Index = 0.99977

Photoelectric:

PE_Eosphorite= 7.05 barns/electron
U=PE_Eosphorite x r_electron= 21.42 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Eosphorite is Not Radioactive

Eosphorite Classification

Dana Class:

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

(42.7)where (AB)5 (XO4)3 Zq · x(H2O)

(42.7.1)Dana Group

42.7.1.1 Childrenite FeAl(PO4)(OH)2·(H2O) Bba2 mm2

42.7.1.2 Eosphorite MnAl(PO4)(OH)2·(H2O) Bbam 2/m 2/m 2/m

42.7.1.3 Ernstite (Mn1-xFex)Al(PO4)(OH)2-xOx C 2/c or Cc Mono

42.7.1.4 Sinkankasite H2MnAl(PO4)2(OH)·6(H2O) P1 1

Strunz Class:

VII/D.14-20 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.14 - Childrenite - Ernstite series

VII/D.14-10 Childrenite FeAl(PO4)(OH)2·(H2O) Bba2 mm2

VII/D.14-20 Eosphorite MnAl(PO4)(OH)2·(H2O) Bbam 2/m 2/m 2/m

VII/D.14-30 Ernstite (Mn1-xFex)Al(PO4)(OH)2-xOx C 2/c or Cc Mono

Other Eosphorite Information

References:

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

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Eosphorite

MnAl(PO4)(OH)2·(H2O)
Dana No: 42.7.1.2 Strunz No: VII/D.14-20
Locality:

Notes: