Matioliite Mineral Data

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General Matioliite Information

Chemical Formula:

NaMgAl5(PO4)4(OH)6•2H2O

Composition:

Molecular Weight = 784.62 gm

Sodium 2.75 % Na 3.71 % Na₂O

Calcium 0.05 % Ca 0.07 % CaO

Magnesium 2.73 % Mg 4.52 % MgO

Manganese 0.07 % Mn 0.09 % MnO

Aluminum 16.64 % Al 31.45 % Al₂O₃

Iron 1.71 % Fe 1.01 % FeO / 1.32 % Fe₂O₃

Phosphorus 15.91 % P 36.45 % P₂O₅

Hydrogen 1.74 % H 15.52 % H₂O

Oxygen 58.40 % O

______ ______

100.00 % 94.15 % = TOTAL OXIDE

Empirical Formula:

Na_0.94Ca_0.01Mg_0.88Fe²⁺_0.11Mn²⁺_0.01Al_4.84Fe³⁺_0.13(PO₄)_4.032(OH)_5.76·(H₂O)

Environment:

Occurs as a secondary mineral in vugs from the Gentil mine granitic pegmatite. Dufrenite group. Magnesium analog of burangaite.

IMA Status:

Approved IMA 2005 (Dana # Added)

Locality:

Gentil mine, Mendes Pimentel County, Minas Gerais, Brazil Link to MinDat.org Location Data.

Name Origin:

Named in honor of Paulo Anselmo Matioli (b.1975), mineral collector, founder, and curator of the Museu de Ciências Naturais Jobas "Jose Bonifácio de Andrada e Silva" Santos, SP, Bra zil.

Synonym:

IMA2005-011

Matioliite Image

Images:

Matioliite

Comments: fiberous, blueish, matioliite aggregate on quartz.
Location: Gentil mine, Mendes Pimentel, Minas Gerais, Brazil. Scale: See Image.
© American Mineralogist

Matioliite Crystallography

Axial Ratios:

a:b:c =4.9682:1:2.6623

Cell Dimensions:

a = 25.075, b = 5.047, c = 13.437, Z = 4; beta = 110.97° V = 1,587.87 Den(Calc)= 3.28

Crystal System:

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

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

By Intensity(I/I_o): 11.654(1), 4.862(0.62), 6.581(0.62),2.666(0.45), 3.027(0.4), 3.291(0.23),

Crystal Structure:

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Atencio D , Coutinho J M V , Mascarenhas Y P , Ellena J A , American Mineralogist , 91 (2006) p.1932-1936, Matioliite, the Mg-analogue of burangaite, from Gentil mine, Mendes Pimentel,, Minas Gerais, Brazil, and other occurrences, Locality: Gentil mine, Mendes Pimentel, Minas Gerais, Brazil, Sample: T = 120 K

Physical Properties of Matioliite

Cleavage:

{100} Perfect

Color:

Blue, Colorless.

Diaphaneity:

Transparent

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Matioliite

Gladstone-Dale:

CI calc= 0.089 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1886,KC= 0.2071
Ncalc = 1.68

Optical Data:

Biaxial (-), a=1.597, b=1.627, g=1.632, bire=0.0350, 2V(Calc)=42, 2V(Meas)=43. Dispersion r > v.

Calculated Properties of Matioliite

Electron Density:

Bulk Density (Electron Density)=3.29 gm/cc
note: Specific Gravity of Matioliite =3.28 gm/cc.

Fermion Index:

Fermion Index = 0.003371735
Boson Index = 0.996628265

Photoelectric:

PE_Matioliite= 1.93 barns/electron
U=PE_Matioliite x rElectron Density= 6.35 barns/cc.

Radioactivity:

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

Matioliite Classification

Dana Class:

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

(42.09)where (A)3 (XO4)2 Zq · x(H2O)

(42.09.01)Burangaite Group

42.09.01.01 Burangaite (Na,Ca)2(Fe,Mg)2Al10(PO4)8(OH,O)12•4(H2O) C 2/c 2/m

42.09.01.02 Dufrenite FeFe4(PO4)3(OH)5•2(H2O) C 2/c 2/m

42.09.01.03 Natrodufrenite Na(Fe,Fe)(Fe,Al)5(PO4)4(OH)6•2(H2O) C 2/c 2/m

42.09.01.04 IMA2008-056! NaMnFe5(PO4)4(OH)6•2H2O C 2/c 2/m

42.09.01.05 Matioliite! NaMgAl5(PO4)4(OH)6•2H2O C 2/c 2/m

Strunz Class:

08.DK.15 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DK -With large and medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1

08.DK.15 Dufrenite FeFe4(PO4)3(OH)5•2(H2O) C 2/c 2/m

08.DK.15 Burangaite (Na,Ca)2(Fe,Mg)2Al10(PO4)8(OH,O)12•4(H2O) C 2/c 2/m

08.DK.15 Natrodufrenite Na(Fe,Fe)(Fe,Al)5(PO4)4(OH)6•2(H2O) C 2/c 2/m

08.DK.15 Matioliite! NaMgAl5(PO4)4(OH)6•2H2O C 2/c 2/m

08.DK.15 IMA2008-056! NaMnFe5(PO4)4(OH)6•2H2O C 2/c 2/m

Other Matioliite Information

References:

NAME( AmMin, v91, p1932) PHYS. PROP.(AmMin, v91, p1932) OPTIC PROP.(AmMin, v91, p1932)

See Also:

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

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Matioliite

NaMgAl5(PO4)4(OH)6•2H2O
Dana No: 42.09.01.05 Strunz No: 08.DK.15
Locality:

Notes: