Eosphorite Mineral Data

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.

Name Pronunciation:

Eosphorite + Pronunciation

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 Énio pegmatite, Galiléia, 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 - Dipyramidal H-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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Forms: ( 1 2 1) ( 0 1 0) ( 1 1 1) ( 1 1 0) ( 1 0 0)

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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

Diaphaneity:

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
Ncalc = 1.67 - 1.68

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.

Calculated Properties of Eosphorite

Electron Density:

Bulk Density (Electron Density)=3.04 gm/cc
note: Specific Gravity of Eosphorite =3.08 gm/cc.

Fermion Index:

Fermion Index = 0.0002374739
Boson Index = 0.9997625261

Photoelectric:

PE_Eosphorite= 7.05 barns/electron
U=PE_Eosphorite x rElectron Density= 21.42 barns/cc.

Radioactivity:

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

Eosphorite Classification

Dana Class:

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

(42.07)where (AB)5 (XO4)3 Zq � x(H2O)

(42.07.01)Childrenite Group

42.07.01.01 Childrenite FeAl(PO4)(OH)2•(H2O) Bba2 mm2

42.07.01.02 Eosphorite MnAl(PO4)(OH)2•(H2O) Bbam 2/m 2/m 2/m

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

42.07.01.04 Sinkankasite H2MnAl(PO4)2(OH)•6(H2O) P1 1

Strunz Class:

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

08.D - Phosphates, etc

08.DD -With only medium-sized cations, (OH, etc.):RO4 = 2:1

08.DD.20 Childrenite FeAl(PO4)(OH)2•(H2O) Bba2 mm2

08.DD.20 Eosphorite MnAl(PO4)(OH)2•(H2O) Bbam 2/m 2/m 2/m

08.DD.20 Ernstite (Mn1-xFex)Al(PO4)(OH)2-xOx C 2/c or Cc Mono

Other Eosphorite Information

See Also:

Links to other databases for Eosphorite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - Scandinavian mineral gallery
17 - Tradeshop.com - The Rainbow of Gems
18 - WWW-MINCRYST
19 - theimage

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Eosphorite

MnAl(PO4)(OH)2•(H2O)
Dana No: 42.07.01.02 Strunz No: 08.DD.20
Locality:

Notes:

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