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Matioliite

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Gentil claim, Mendes Pimentel, Doce valley, Minas Gerais, Brazil
© Vincent Bourgoin

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Formula:
NaMgAl
 
5
(PO
 
4
)
 
4
(OH)
 
6
 · 2H
 
2
O
System:MonoclinicColour:Blue to colourless
Hardness:5
Name:Named for Paulo Anselmo Matioli (b. 1975)
Isostructural with:Burangaite, Dufrénite, Natrodufrénite


Burangaite-Matioliite Series. Magnesium analogue of Burangaite.

Classification of Matioliite

IMA status:Approved 2005
Strunz 8th edition ID:7/D.11-115
Nickel-Strunz 10th (pending) edition ID:8.DK.15

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
K : With large and medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
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Type Occurrence of Matioliite

Type Locality:Gentil claim, Mendes Pimentel, Doce valley, Minas Gerais, Brazil
General Appearance of Type Material:Prismatic to tabular crystals, up to 1 mm long
Place of Conservation of Type Material:Museum of Geosciences, Department of Geosciences, University of Sao Paulo, Brazil
"Jose Bonifacio de Andrada e Silva" (Jobas) Museum of Natural Sciences, Santos, Sao Paulo, Brazil
Geological Setting of type material:Secondary hydrothermal mineralization in a granite pegmatite
Associated Minerals at type locality:
QuartzMuscoviteMoraesiteGormaniteFluorapatite
CrandalliteChildreniteCassiteriteAlbite

Physical Properties of Matioliite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Blue to colourless
Streak:White
Hardness (Mohs):5
Hardness Data:Measured
Density (calculated):2.948 g/cm3

Crystallography of Matioliite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/b {B1 1 2/b} {C2/c} {C1 2/c 1}
Cell Parameters:a = 25.075Å, b = 5.047Å, c = 13.437Å
β = 110.97°
Ratio:a:b:c = 4.968 : 1 : 2.662
Unit Cell Volume:V 1587.9 ų
Z:4
X-Ray Powder Diffraction:
d-spacingIntensity
11.654 (100)
6.581 (62)
5.833 (20)
4.930 (13)
4.862 (62)
4.011 (15)
3.553 (18)
3.291 (23)
3.138 (14)
3.103 (31)
3.075 (19)
3.027 (40)
2.912 (12)
2.785 (17)
2.666 (45)
2.517 (09)
2.349 (18)
2.342 (09)
2.041 (15)
2.040 (07)
1.940 (12)
1.936 (07)
1.678 (14)
1.672 (09)
Comments:Gentil mine

Optical Data of Matioliite

Type:Biaxial (-)
RI values: nα = 1.597 nβ = 1.627 nγ = 1.627
2V:Measured: 43° , Calculated: 44°
Maximum Birefringence:δ = 0.030

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r > v
Pleochroism:Visible
Comments:Y > X > Z, X = light blue to colorless, Y = blue, Z = colorless

Chemical Properties of Matioliite

Formula:
NaMgAl
 
5
(PO
 
4
)
 
4
(OH)
 
6
 · 2H
 
2
O
Essential elements:Al, H, Mg, Na, O, P
All elements listed in formula:Al, H, Mg, Na, O, P
Empirical Formula:
(Na
 
0.94
Ca
 
0.01
)
 
Σ0.95
(Mg
 
0.88
Fe
2+
0.11
Mn
 
0.01
)
 
Σ1.00
(Al
 
4.84
Fe
3+
0.13
)
 
Σ4.97
(PO
 
4
)
 
4.03
(OH)
 
5.76
 · 2H
 
2
O

Relationship of Matioliite to other Species

Series:Forms a series with Burangaite (see here)
Related Minerals - Nickel-Strunz Grouping):

- +
8.DK.Richelsdorfite
Ca
 
2
Cu
 
5
Sb(AsO
 
4
)
 
4
(OH)
 
6
Cl · 6H
 
2
O
8.DK.10Bariopharmacosiderite
Ba
 
0.5
Fe
3+
4
(AsO
 
4
)
 
3
(OH)
 
4
 · 5H
 
2
O
8.DK.10Pharmacosiderite
KFe
3+
4
(AsO
 
4
)
 
3
(OH)
 
4
 · 6-7H
 
2
O
8.DK.10Natropharmacosiderite
(Na,K)Fe
3+
4
(AsO
 
4
)
 
3
(OH)
 
4
 · 6-7H
 
2
O
8.DK.10Hydroniumpharmacosiderite
(H
 
3
O)Fe
 
4
(AsO
 
4
)
 
3
(OH)
 
4
 · 4H
 
2
O
8.DK.12Pharmacoalumite
KAl
 
4
(AsO
 
4
)
 
3
(OH)
 
4
 · 6.5H
 
2
O
8.DK.12Natropharmacoalumite
NaAl
 
4
(AsO
 
4
)
 
3
(OH)
 
4
 · 4H
 
2
O
8.DK.12Bariopharmacoalumite
BaAl
 
4
(AsO
 
4
)
 
3
(OH)
 
4
 · 4H
 
2
O
8.DK.15Burangaite
NaFe
2+
 
Al
 
5
(PO
 
4
)
 
4
(OH)
 
6
 · 2H
 
2
O
8.DK.15Dufrénite
Ca
 
0.5
Fe
2+
 
Fe
3+
5
(PO
 
4
)
 
4
(OH)
 
6
 · 2H
 
2
O
8.DK.15Natrodufrénite
NaFe
2+
 
(Fe
3+
 
,Al)
 
5
(PO
 
4
)
 
4
(OH)
 
6
 · 2H
 
2
O
8.DK.15Gayite
NaMn
2+
 
Fe
3+
5
(PO
 
4
)
 
4
(OH)
 
6
 · 2H
 
2
O
8.DK.20Kidwellite
NaFe
3+
9
(PO
 
4
)
 
6
(OH)
 
11
 · 3H
 
2
O
8.DK.25Bleasdaleite
(Ca,Fe
3+
 
)
 
2
Cu
 
5
(Bi,Cu)(PO
 
4
)
 
4
(H
 
2
O,OH,Cl)
 
13
8.DK.30Matulaite
(Fe
3+
 
,Al)Al
 
7
(PO
 
4
)
 
4
(PO
 
3
OH)
 
2
(OH)
 
8
(H
 
2
O)
 
8
 · 8H
 
2
O
8.DK.35Krasnovite
Ba(Al,Mg)(PO
 
4
,CO
 
3
)(OH)
 
2
 · H
 
2
O

Other Names for Matioliite

Synonyms:
IMA2005-011
Other Languages:

Other Information

Fluorescence in UV light:non-fluorescent
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Matioliite

Reference List:

- +
Atencio, D., J.M.V. Coutinho, Y.P. Mascarenhas, and J.A. Ellena (2006): "Matioliite, the Mg-analog of burangaite, from Gentil mine, Mendes Pimentel, Minas Gerais, Brazil, and other occurrences". Am. Mineral. 91:1932-1936.

Internet Links for Matioliite

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    • Localities for Matioliite

    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Austria
     
    • Carinthia
      • Millstatt lake ridge
        • Spittal
          • Millstatt lake
    		Walter, F. & Ettinger, K. (2001): 1250. Burangait vom Hochgosch, Millstätter See-Rücken. Pp. 149-150 in NIEDERMAYR, G., F. BERNHARD, G. BLASS, H.-P. BOJAR, F. BRANDSTÄTTER, K. ETTINGER, H.-W. GRAF, V. M. F. HAMMER, B. LEIKAUF, H. MEDITZ, B. MOSER, W. POSTL, J. TAUCHER & P. TOMAZIC (2001): Neue Mineralfunde aus Österreich L. Carinthia II, 191./111.: 141-185.
    Brazil
     
    • Minas Gerais
      • Doce valley
        • Mendes Pimentel
    		Am.Min 91,1932-1936(2006); Atencio, D., Coutinho, J.M.V., Mascarenhas, Y.P., Ellena, J. (2006): Matioliite, the Mg-analog of burangaite, from Gentil mine, Mendes Pimentel, Minas Gerais, Brazil, and other occurrences. American Mineralogist, 91, 1932-1936.
    USA
     
    • Nevada
      • Eureka Co.
        • Maggie Creek District
    		Am. Min. 91, 1932-1936 (2006)
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