Phosphophyllite Mineral Data

Phosphophyllite Mineral Data +

General Phosphophyllite Information

Chemical Formula:

Zn2(Fe++,Mn)(PO4)2·4(H2O)

Composition:

Molecular Weight = 448.40 gm

Manganese 3.06 % Mn 3.95 % MnO

Zinc 29.17 % Zn 36.30 % ZnO

Iron 9.34 % Fe 12.02 % FeO

Phosphorus 13.82 % P 31.66 % P₂O₅

Hydrogen 1.80 % H 16.07 % H₂O

Oxygen 42.82 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Zn₂Fe²⁺_0.75Mn²⁺_0.25(PO₄)₂·4(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1920

Locality:

Hagendorf, Waidhaus, Oberpfalz, Bayern (Bavaria), Germany Link to MinDat.org Location Data.

Name Origin:

Named after its chemical composition containing phosphorus and the Greek fyllon - meaning "leaf."

Synonym:

ICSD 100078

PDF 29-1427

Phosphophyllite Image

Images:

Phosphophyllite

Comments: Transparent, blue crystal of phosphophyllite.
Location: Hagendorf, Bavaria, Germany. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Phosphophyllite Crystallography

Axial Ratios:

a:b:c =2.0403:1:2.076

Cell Dimensions:

a = 10.377, b = 5.086, c = 10.559, Z = 2; beta = 121.1° V = 477.18 Den(Calc)= 3.12

Crystal System:

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

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

By Intensity(I/I_o): 4.438(1), 8.86(0.85), 3.383(0.6),

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Forms: [ 2 1 0] [ 0 1 0] [ 1 1 1] [ 1 0 2] [ 1 1 0] [ 1 0 0] [ 2 1 1] [ 0 0 1]

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Crystal Structure:

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Hill R J , American Mineralogist , 62 (1977) p.812-817, The crystal structure of phosphophyllite

View Additional jPOWD Structure files for Phosphophyllite
[1]

Physical Properties of Phosphophyllite

Cleavage:

[100] Perfect, [010] Distinct, [102] Distinct

Color:

Blue green, Colorless, Light green.

Density:

3.1

Diaphaniety:

Transparent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

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

Hardness:

3-3.5 - Calcite-Copper Penny

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Phosphophyllite

Gladstone-Dale:

CI meas= 0.02 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.027 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.195,KPDmeas= 0.1962,KC= 0.2003

Optical Data:

Biaxial (-), a=1.595, b=1.614, g=1.616, bire=0.0210, 2V(Calc)=34, 2V(Meas)=44.3.

Pleochroism (x):

colorless.

Pleochroism (y):

pale blue green.

Pleochroism (z):

pale blue green.

Calculated Properties of Phosphophyllite

Electron Density:

r_electron=3.04 gm/cc
note: r_{Phosphophyllite}=3.10 gm/cc.

Fermion Index

Fermion Index = 0.01414
Boson Index = 0.98586

Photoelectric:

PE_{Phosphophyllite}= 18.48 barns/electron
U=PE_{Phosphophyllite} x r_electron= 56.16 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Phosphophyllite is Not Radioactive

Phosphophyllite Classification

Dana Class:

40.2.7.1 (40)Hydrated Phosphates, etc

(40.2)where A++ (B++)2 (XO4) · x(H2O)

(40.2.7)Dana Group

40.2.7.1 Phosphophyllite Zn2(Fe,Mn)(PO4)2·4(H2O) P 2₁/c 2/m

Strunz Class:

VII/C.11-10 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg

VII/C.11 - Phosphophyllite - Fahleite series

VII/C.11-10 Phosphophyllite Zn2(Fe,Mn)(PO4)2·4(H2O) P 2₁/c 2/m

VII/C.11-20 Hopeite Zn3(PO4)2·4(H2O) P nma 2/m 2/m 2/m

VII/C.11-30 Parahopeite Zn3(PO4)2·4(H2O) P1 1

VII/C.11-40 Radovanite! Cu2Fe(AsO4)[AsO2(OH)2]·H2O P nma 2/m 2/m 2/m

VII/C.11-50 Smolianinovite (Co,Ni,Mg,Ca)3(Fe,Al)2(AsO4)4·11(H2O) Unk Ortho

VII/C.11-60 Fahleite Zn5CaFe2(AsO4)6·14(H2O) Unk Ortho

Other Phosphophyllite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Phosphophyllite

Zn2(Fe++,Mn)(PO4)2·4(H2O)
Dana No: 40.2.7.1 Strunz No: VII/C.11-10
Locality:

Notes: