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 % P2 O5
Hydrogen 6.74 % H 60.22 % H2 O
Oxygen 72.98 % O
______ ______
100.00 % 99.79 % = TOTAL OXIDE
Empirical Formula:
Mg2.92 Fe2+ 0.01 (PO4 )2.01 •22.05(H2 O)
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
X Ray Diffraction:
By Intensity(I/Io ): 7.98(1)(002), 5.32(0.63)(003), 3.19(0.45)(11 4,005,21 2),
2.658(0.37)(006,022 ), 2.896(0.33)(202), 2.728(0.32)(11 5), 2.867(0.3)(2 22), 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:
PECattiite = 0.89 barns/electronU=PECattiite x r Electron 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 � 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 � 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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Cattiite
Mg3(PO4)2•22(H2O)
Dana No: 40.03.12.02 Strunz No: 08.CE.50
Locality:
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