Cattiite Mineral Data

Cattiite Mineral Data

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General Cattiite Information

Chemical Formula:

Mg3(PO4)2·22(H2O)

Composition:

Molecular Weight = 659.66 gm

Magnesium 10.76 % Mg 17.84 % MgO

Iron 0.08 % Fe 0.11 % FeO

Phosphorus 9.44 % P 21.63 % P₂O₅

Hydrogen 6.74 % H 60.22 % H₂O

Oxygen 72.98 % O

______ ______

100.00 % 99.79 % = TOTAL OXIDE

Empirical Formula:

Mg_2.92Fe²⁺_0.01(PO₄)_2.01·22.05(H₂O)

Environment:

Occurs in cavities in a dolomite carbonatite vein that cuts forsterite-magnetite ore.

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

Zhelezny Mine Kovdor massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Michele Catti, Professor of Physical Chemistry, University of Milano Bicocca, Italy.

Synonym:

IMA2000-032

Cattiite Image

Images:

Cattiite

Comments: Colorless cattiite grain fragment.
Location: Zheleznyi Fe Mine, Kovdor Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Grain size 2 mm.
© Thomas Witzke / Abraxas-Verlag

Cattiite Crystallography

Axial Ratios:

a:b:c =1.001:1:2.3327

Cell Dimensions:

a = 6.932, b = 6.925, c = 16.154, Z = 1; alpha = 82.21°, beta = 89.7°, gamma = 119.51° V = 668.62 Den(Calc)= 1.64

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 7.98(1)(002), 5.32(0.63)(003), 3.19(0.45)(114,005,212), 2.658(0.37)(006,022), 2.896(0.33)(202), 2.728(0.32)(115), 2.867(0.3)(222), 4.

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Catti M , Franchini-Angela M , Ivaldi G , Zeitschrift fur Kristallographie , 155 (1981) p.53-64, A case of polytypism in hydrated oxysalts:, the crystal structure of Mg3(PO4)2*22H2O-II, Locality: synthetic

Physical Properties of Cattiite

Cleavage:

[001] Perfect

Color:

Colorless.

Density:

1.65

Diaphaniety:

Transparent

Fracture:

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

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

2 - Gypsum

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Cattiite

Gladstone-Dale:

CI meas= -0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.015 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2843,KPDmeas= 0.2826,KC= 0.2802

Optical Data:

Biaxial (-), a=1.459, b=1.47, g=1.47, bire=0.0110

Calculated Properties of Cattiite

Electron Density:

r_electron=1.75 gm/cc
note: r_Cattiite=1.65 gm/cc.

Fermion Index

Fermion Index = 0.01113
Boson Index = 0.98887

Photoelectric:

PE_Cattiite= 0.89 barns/electron
U=PE_Cattiite x r_electron= 1.56 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Cattiite is Not Radioactive

Cattiite Classification

Dana Class:

40.3.12.2 (40)Hydrated Phosphates, etc

(40.3)where (A++)3 (XO4)2 · x(H2O)

(40.3.12)Dana Group

40.3.12.1 Phaunouxite Ca3(AsO4)·11(H2O) P1 1

40.3.12.2 Cattiite ! Mg3(PO4)2·22(H2O) P1 1

Strunz Class:

VII/C.13-20* 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.13 - Vivianite group

VII/C.13-10 Bobierrite Mg3(PO4)2·8(H2O) C 2/c 2/m

VII/C.13-20* Cattiite Mg3(PO4)2·22(H2O) P1 1

VII/C.13-20 Manganese-hornesite (Mn,Mg)3(AsO4)2·8(H2O) P 2₁/c 2/m

VII/C.13-30 Baricite (Mg,Fe)3(PO4)2·8(H2O) C 2/m 2/m

VII/C.13-40 Vivianite Fe3(PO4)2·8(H2O) C 2/m 2/m

VII/C.13-45 Arupite (Ni,Fe)3(PO4)2·8(H2O) I2/m 2/m

VII/C.13-50 Hornesite Mg3(AsO4)2·8(H2O) I2/m 2/m

VII/C.13-60 Parasymplesite Fe3(AsO4)2·8(H2O) C 2/m 2/m

VII/C.13-70 Erythrite Co3(AsO4)2·8(H2O) I2/m 2/m

VII/C.13-80 Annabergite Ni3(AsO4)2·8(H2O) I2/m 2/m

VII/C.13-90 Kottigite Zn3(AsO4)2·8(H2O) C 2/m 2/m

Other Cattiite Information

References:

NAME( AmMin, 88:1175) PHYS. PROP.(AmMin, 88:1175) OPTIC PROP.(AmMin, 88:1175)

See Also:

Links to other databases for Cattiite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Cattiite

Mg3(PO4)2·22(H2O)
Dana No: 40.3.12.2 Strunz No: VII/C.13-20*
Locality:

Notes: