Cattiite Mineral Data

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 - Pinacoidal H-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.

Physical Properties of Cattiite

Cleavage:

{001} Perfect

Color:

Colorless.

Density:

1.65

Diaphaneity:

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
Ncalc = 1.46

Optical Data:

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

Calculated Properties of Cattiite

Electron Density:

Bulk Density (Electron Density)=1.75 gm/cc
note: Specific Gravity of Cattiite =1.65 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Cattiite= 0.89 barns/electron
U=PE_Cattiite x rElectron Density= 1.56 barns/cc.

Radioactivity:

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

Cattiite Classification

Dana Class:

40.03.12.02 (40)Hydrated Phosphates, etc

(40.03)where (A++)3 (XO4)2 ï¿½ x(H2O)

(40.03.12)Dana Group

40.03.12.01 Phaunouxite Ca3(AsO4)•11(H2O) P1 1

40.03.12.02 Cattiite! Mg3(PO4)2•22(H2O) P1 1

Strunz Class:

08.CE.50 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CE -With only medium-sized cations, RO4:H2O ï¿½ 1:2.5

08.CE.50 Cattiite! Mg3(PO4)2•22(H2O) P1 1

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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Print or Cut-and-Paste your Cattiite Specimen Label here :

Cattiite

Mg3(PO4)2•22(H2O)
Dana No: 40.03.12.02 Strunz No: 08.CE.50
Locality:

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