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Montgomeryite

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Big Photo

Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA
© JBS 2006

Show Montgomeryite Photos (52)



Formula:
Ca
 
4
MgAl
 
4
(PO
 
4
)
 
6
(OH)
 
4
 · 12H
 
2
O
System:MonoclinicColour:Dark green to light ...
Hardness:4
Name:
After Arthur Montgomery (1909-1999), American Mineralogist, Professor of Geology, Lafayette College, Easton, Pennsylvania, USA, who collected the first specimens.
Isostructural with:Kingsmountite


Montgomeryite Group.
The Mg analogue of Kingsmountite.

A secondary mineral in sedimentary phosphate nodules and as a late-stage mineral in highly oxidized phosphate nodules in granitic pegmatite.


Classification of Montgomeryite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:7/D.31-10
Nickel-Strunz 10th (pending) edition ID:8.DH.25

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
H : With large and medium-sized cations, (OH, etc.):RO4 < 1:1
Dana 8th edition ID:42.11.8.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
11 : (AB)3(XO4)2Zq·xH2O
Hey's CIM Ref.:19.8.12

19 : Phosphates
8 : Phosphates of Al and other metals
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Type Occurrence of Montgomeryite

Type Locality:Clay Canyon, Fairfield, Oquirrh Mts, Utah Co., Utah, USA
Place of Conservation of Type Material:Harvard University, Cambridge, Massachusetts, USA: #95481.
Year of Discovery:1940
Geological Setting of type material:Phosphate nodules in sedmimentary rocks.
Associated Minerals at type locality:
WarditeVarisciteGordoniteEnglishiteCrandallite

Occurrences of Montgomeryite

Geological Setting:Granitic pegmatites

Physical Properties of Montgomeryite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent, Translucent
Colour:Dark green to light green, colourless, red, yellow
Comment:Coloration may be zoned.
Hardness (Mohs):4
Cleavage:Perfect
On {010}, perfect; on {100}, poor.
Density (measured):2.53 g/cm3
Density (calculated):2.523 g/cm3

Crystallography of Montgomeryite

Crystal System:Monoclinic
Class (H-M):2 - Sphenoidal
Space Group:B2 {B1 1 2} {C2} {C1 2 1}
Cell Parameters:a = 10.02Å, b = 24.12Å, c = 6.24Å
β = 91.55°
Ratio:a:b:c = 0.415 : 1 : 0.259
Unit Cell Volume:V 1,507.55 ų (Calculated from Unit Cell)
Z:2
Morphology:Crystals lathlike, flattened on {010} and elongated and striated along [001]; terminated by pyramids. {010} dominant, with many {hk0} vicinal prism forms. Commonly occur in subparallel growths in contact on {010}. Massive; as subparallel aggregates of coarse plates.

Optical Data of Montgomeryite

Type:Biaxial (-)
RI values: nα = 1.572 nβ = 1.578 nγ = 1.582
2V:Measured: 75° , Calculated: 78°
Maximum Birefringence:δ = 0.010

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:r < v strong
Pleochroism:Weak
Comments:X = Colourless to pale green
Y = Z = Colourless

also, may exhibit:

X = Light orange-brown
Y = Pale magenta-pink
Z = Light orange-brown

Chemical Properties of Montgomeryite

Formula:
Ca
 
4
MgAl
 
4
(PO
 
4
)
 
6
(OH)
 
4
 · 12H
 
2
O
Essential elements:Al, Ca, H, Mg, O, P
All elements listed in formula:Al, Ca, H, Mg, O, P

Relationship of Montgomeryite to other Species

Structurally related to group(s):
Montgomeryite Group
Common Associates:
WhitlockiteTriphyliteRobertsiteMitridatiteFairfieldite
EnglishiteCarbonate-rich Apatite
Related Minerals - Nickel-Strunz Grouping):

- +
8.DH.05Minyulite
KAl
 
2
(PO
 
4
)
 
2
(OH,F) · 4H
 
2
O
8.DH.10Leucophosphite
KFe
3+
2
(PO
 
4
)
 
2
(OH) · 2H
 
2
O
8.DH.10Spheniscidite
(NH
 
4
,K)(Fe
3+
 
,Al)
 
2
(PO
 
4
)
 
2
(OH) · 2H
 
2
O
8.DH.10Tinsleyite
KAl
 
2
(PO
 
4
)
 
2
(OH) · 2H
 
2
O
8.DH.15Jahnsite-(CaMnFe)
{Ca}{Mn
2+
 
}{Fe
2+
2
}{Fe
3+
2
}(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
8.DH.15Jahnsite-(CaMnMg)
{Ca}{Mn
2+
 
}{(Mg,Fe
2+
 
)
 
2
}{Fe
3+
2
}(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
8.DH.15Jahnsite-(CaMnMn)
{Ca}{Mn
2+
 
}{Mn
2+
2
}{Fe
3+
2
}(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
8.DH.15Keckite
CaMn
2+
 
Fe
3+
2
Fe
3+
2
(PO
 
4
)
 
4
(OH)
 
3
(H
 
2
O)
 
7
8.DH.15Rittmannite
{(Mn
2+
 
,Ca)}{Mn
2+
 
}{(Fe
2+
 
,Mn
2+
 
,Mg)
 
2
}{(Al,Fe
3+
 
)
 
2
}(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
8.DH.15Whiteite-(CaFeMg)
{Ca}{(Fe
2+
 
,Mn
2+
 
)}{Mg
 
2
}{Al
 
2
}(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
8.DH.15Whiteite-(CaMnMg)
{Ca}{Mn
2+
 
}{Mg
 
2
}{Al
 
2
}(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
8.DH.15Whiteite-(MnFeMg)
{(Mn
2+
 
,Ca)}{(Fe
2+
 
,Mn
2+
 
)}{Mg
 
2
}{Al
 
2
}(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
8.DH.15Jahnsite-(MnMnMn)
{Mn
2+
 
}{Mn
2+
 
}{Mn
2+
2
}{Fe
3+
2
}(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
8.DH.15Kaluginite
(Mn
2+
 
,Ca)MgFe
3+
 
(PO
 
4
)
 
2
(OH) · 4H
 
2
O
8.DH.15Jahnsite-(CaFeFe)
{Ca}{Fe
2+
 
}{Fe
2+
2
}{Fe
3+
2
}(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
8.DH.15Jahnsite-(NaFeMg)
{Na}{Fe
3+
 
}{Mg
 
2
}{Fe
3+
2
}(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
8.DH.15Jahnsite-(NaMnMg)
{Na}{Mn
3+
 
}{Mg
 
2
}{Fe
3+
2
}(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
8.DH.15Jahnsite-(CaMgMg)
{Ca}{Mg}{Mg
 
2
}{Fe
3+
2
}(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
8.DH.20Manganosegelerite
(Mn
2+
 
,Ca)(Mn
2+
 
,Fe
2+
 
,Mg)Fe
3+
 
(PO
 
4
)
 
2
(OH)
 
2
 · 4H
 
2
O
8.DH.20Overite
CaMgAl(PO
 
4
)
 
2
(OH) · 4H
 
2
O
8.DH.20Segelerite
Ca
 
2
 Mg
 
2
 Fe
3+
2
(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
8.DH.20Wilhelmvierlingite
CaMnFe
3+
 
(PO
 
4
)
 
2
(OH) · 2H
 
2
O
8.DH.20Juonniite
CaMgSc(PO
 
4
)
 
2
(OH) · 4H
 
2
O
8.DH.25Calcioferrite
Ca
 
2
Fe
3+
2
(PO
 
4
)
 
3
(OH) · 7H
 
2
O
8.DH.25Kingsmountite
Ca
 
4
(Fe
2+
 
,Mn
2+
 
)Al
 
4
(PO
 
4
)
 
6
(OH)
 
4
 · 12H
 
2
O
8.DH.25Zodacite
Ca
 
4
Mn
2+
 
Fe
3+
4
(PO
 
4
)
 
6
(OH)
 
4
 · 12H
 
2
O
8.DH.30Arseniosiderite
Ca
 
2
Fe
3+
3
(AsO
 
4
)
 
3
O
 
2
 · 3H
 
2
O
8.DH.30Kolfanite
Ca
 
2
Fe
3+
2
(AsO
 
4
)
 
3
O
 
2
 · 2H
 
2
O
8.DH.30Mitridatite
Ca
 
2
Fe
3+
3
(PO
 
4
)
 
3
O
 
2
 · 3H
 
2
O
8.DH.30Pararobertsite
Ca
 
2
Mn
3+
3
(PO
 
4
)
 
3
O
 
2
 · 3H
 
2
O
8.DH.30Robertsite
Ca
 
3
Mn
3+
4
(PO
 
4
)
 
4
(OH)
 
6
 · 3H
 
2
O
8.DH.30Sailaufite
(Ca,Na,☐)
 
2
Mn
3+
3
(AsO
 
4
)
 
2
(CO
 
3
)O
 
2
 · 3H
 
2
O
8.DH.35Mantienneite
KMg
 
2
Al
 
2
Ti(PO
 
4
)
 
4
(OH)
 
3
 · 15H
 
2
O
8.DH.35Paulkerrite
K(Mg,Mn
2+
 
)
 
2
(Fe
3+
 
,Al,Ti,Mg)
 
2
Ti(PO
 
4
)
 
4
(OH)
 
3
 · 15H
 
2
O
8.DH.35Benyacarite
(H
 
2
O,K)
 
2
(Mn
2+
 
,Fe
2+
 
)
 
2
(Fe
3+
 
,Ti)
 
2
Ti(PO
 
4
)
 
4
(O,F)
 
2
 · 14H
 
2
O
8.DH.40Xanthoxenite
Ca
 
4
Fe
3+
2
(PO
 
4
)
 
4
(OH)
 
2
 · 3H
 
2
O
8.DH.45Mahnertite
NaCu
 
3
(AsO
 
4
)
 
2
Cl · 5H
 
2
O
8.DH.50Andyrobertsite
KCdCu
 
5
(AsO
 
4
)
 
4
(H
 
2
AsO
 
4
) · 2H
 
2
O
8.DH.50Calcioandyrobertsite
KCaCu
 
5
(AsO
 
4
)
 
4
(H
 
2
AsO
 
4
) · 2H
 
2
O
8.DH.55Englishite
K
 
3
Na
 
2
Ca
 
10
Al
 
15
(PO
 
4
)
 
21
(OH)
 
7
 · 26H
 
2
O
8.DH.60Bouazzerite
Bi
 
6
(Mg,Co)
 
11
Fe
3+
14
(AsO
 
4
)
 
18
(OH)
 
4
O
 
12
 · 86H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
19.8.1Montebrasite
LiAl(PO
 
4
)(OH)
19.8.2Brazilianite
NaAl
 
3
(PO
 
4
)
 
2
(OH)
 
4
19.8.3Wardite
NaAl
 
3
(PO
 
4
)
 
2
(OH)
 
4
 · 2H
 
2
O
19.8.4Tancoite
LiNa
 
2
Al(PO
 
4
)(HPO
 
4
)(OH)
19.8.5Bertossaite
(Li,Na)
 
2
(Ca,Fe
2+
 
,Mn
2+
 
)Al
 
4
(PO
 
4
)
 
4
(OH,F)
 
4
19.8.6Tinsleyite
KAl
 
2
(PO
 
4
)
 
2
(OH) · 2H
 
2
O
19.8.7Taranakite
(K,NH
 
4
)Al
 
3
(PO
 
4
)
 
3
(OH) · 9H
 
2
O
19.8.8Francoanellite
K
 
3
Al
 
5
(PO
 
4
)
 
2
(HPO
 
4
)
 
3
 · 12H
 
2
O
19.8.9Gordonite
MgAl
 
2
(PO
 
4
)
 
2
(OH)
 
2
 · 8H
 
2
O
19.8.10Aldermanite
Mg
 
5
Al
 
12
(PO
 
4
)
 
8
(OH)
 
22
 · 32H
 
2
O
19.8.11Overite
CaMgAl(PO
 
4
)
 
2
(OH) · 4H
 
2
O
19.8.14Foggite
CaAl(PO
 
4
)(OH)
 
2
 · H
 
2
O
19.8.15Gatumbaite
CaAl
 
2
(PO
 
4
)
 
2
(OH)
 
2
 · H
 
2
O
19.8.16Crandallite
CaAl
 
3
(PO
 
4
)
 
2
(OH)
 
5
 · H
 
2
O
19.8.17Matulaite
(Fe
3+
 
,Al)Al
 
7
(PO
 
4
)
 
4
(PO
 
3
OH)
 
2
(OH)
 
8
(H
 
2
O)
 
8
 · 8H
 
2
O
19.8.19Lehiite
19.8.20Millisite
(Na,K)CaAl
 
6
(PO
 
4
)
 
4
(OH)
 
9
 · 3H
 
2
O
19.8.21Englishite
K
 
3
Na
 
2
Ca
 
10
Al
 
15
(PO
 
4
)
 
21
(OH)
 
7
 · 26H
 
2
O
19.8.22Kleemanite
ZnAl
 
2
(PO
 
4
)
 
2
(OH)
 
2
 · 3H
 
2
O
19.8.23Mantienneite
KMg
 
2
Al
 
2
Ti(PO
 
4
)
 
4
(OH)
 
3
 · 15H
 
2
O
19.8.24Paulkerrite
K(Mg,Mn
2+
 
)
 
2
(Fe
3+
 
,Al,Ti,Mg)
 
2
Ti(PO
 
4
)
 
4
(OH)
 
3
 · 15H
 
2
O

Other Names for Montgomeryite

Other Languages:
German:Montgomeryit
Russian:Монтгомериит
Spanish:Montgomeryita

Other Information

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 Montgomeryite

Reference List:

- +
Larsen, E.S. (1940) American Mineralogist: 25: 315.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 978-979.

Moore, P.B. and T. Araki (1974) Montgomeryite, Ca4Mg(H2O)12[Al4(OH)4(PO4)6]: its crystal structure and relation to vauxite, Fe2+2(H2O)4[Al4(OH)4(H2O)4(PO4)4]•4H2O. American Mineralogist (1974): 59: 843-850.

Fanfani, L., A. Nunzi, P.F. Zanazzi, and A.R. Zanzari (1976) Additional data on the crystal structure of montgomeryite. American Mineralogist (1976): 61: 12-14.

Dunn, P.J., W.L. Roberts, T.J. Campbell, and P.B. Leavens (1983) Red montgomeryite and associated minerals from the Tip Top pegmatite with notes on kingsmountite and calcioferrite. Mineralogical Record, 14, 195-197.

Ankinovich, E.A., S.G. Ankinovich, A.A. Dara, and F.A. Kurmakaeva (1983) Ferrous montgomeryite of the Kara-Tau. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva (Proceedings of the Russian Mineralogical Society), 112, 84-88 (in Russian with English abstract).

Internet Links for Montgomeryite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Montgomeryite details from Handbook of Mineralogy (PDF)
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    • Localities for Montgomeryite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    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.
    Australia
     
    Trueman, N. A. (1965): The phosphate, volcanic, and carbonate rocks of Christmas Island, Indian Ocean. J. Geol. Soc. Australia 12, 261-283.
    • South Australia
      • Eyre Peninsula
        • Middleback Range
          • Iron Knob
    		No reference listed
      • Olary Province
        • Kalabity homestead area
    • Victoria
      • Bacchus Marsh
    		No reference listed
    • Western Australia
    		Min.Mag. 39,577-579(1974)
      • Upper Gascoyne Shire
        • Woodlands station
    		Nickel, E. H. et al. (2008): The Woodlands variscite-gold occurrence in the north Gascoyne region of Western Australia. Australian Journal of Mineralogy 14, 27-36.
    Austria
     
    • Styria
      • Leoben
    		Mitteilungen der Abteilung für Mineralogie am Landesmuseum Joanneum (1998), 62/63, 55-58.
    Brazil
     
    • Minas Gerais
      • Jequitinhonha valley
        • Itinga
          • Taquaral
    		Min Rec (1973) 4 (5), 207-213
    Cape Verde
     
    • Barlavento islands
    		Figueiredo, M. O.; Pereira da Silva, T.; Veiga, J. P.; Chevallier, P. (2003): Phosphatization of basaltic rocks from Sal Island, Cape Verde Archipelago: A microtopochemical approach using synchrotron radiation X-ray fluorescence. Journal de Physique IV: Proceedings, 104 (X-Ray Microscopy), 399-402.
    Germany
     
    • Bavaria
      • Lower Bavaria
        • Bavarian Forest
          • Zwiesel
            • Rabenstein
    		Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
    • Hesse
      • Odenwald
        • Heppenheim
          • Kirschhausen
    		A. Wittern: Mineralfundorte in Deutschland, Schweizerbart (Stuttgart), 2001
    Israel
     
    • Haifa District
      • Mount Carmel
    		Goldberg, P. S. & Nathan, Y. (1975): Phosphate mineralogy of et-Tabun cave, Mount Carmel, Israel. Mineralogical Magazine 40, 253-258.
    Kazakhstan
     
    • Southern Kazakhstan Province (Ongtüstik Qazaqstan Oblysy; Yuzhno-Kazakhstanskaya Oblast')
      • Karatau Range
    		Bernard & Hyrsl (2004) Minerals and their Localities.
    Mexico
     
    • Coahuila
      • Mun. de Cuatrociénegas
        • Cuatro Ciénegas (Cuatrociénegas de Carranza; Venustiano Carranza)
          • Limestone caves
    		Forti, P. et al. (2006): ACTA CARSOLOGICA 35/1, 79–98.
    Namibia
     
    • Erongo Region
      • Karibib District
        • Usakos
    		Der Aufschluss 36:117-119
    Portugal
     
    • Guarda District
      • Sabugal
    		Schnorrer-Köhler (1991), Mineral Occurrences.
    • Viana do Castelo District
      • Caminha
        • Arga de Baixo/Arga de Cima
    		self-find. Pedro Alves collection
    • Viseu District
      • Sátão
        • Ferreira de Aves
          • Aldeia Nova
    South Africa
    Minerals of South Africa
    Spain
     
    • Catalonia
      • Barcelona
        • Baix Llobregat
    		Camprubí, A., Melgarejo, J.C., Proenza, J.A., Costa, F., Bosch, J., Estrada, A., Borrell, F., Yushkin, N.P., Andreichev, V.L., 2003. Mining and geological knowledge during the Neolithic: a geological study on the variscite mines at Gavà, Catalonia. Episodes, v. 26 (4), p. 295-301.
            • Bruguers
    		Bareche, E (2005) "Els minerals de Catalunya. Segle XX" Ed. Grup Mineralògic Català, Barcelona, 269 p.
        • Vallès Occidental
          • Montcada i Reixac
    		Mineralogistes de Catalunya (1997), VII (1): 34-55
    Sweden
     
    • Lappland
      • Kiruna district
        • Svappavaara
    		No reference listed
    USA
     
    • Nevada
      • Elko Co.
    		NBMG Spec. Pub. 31 Minerals of Nevada
      • Humboldt Co.
        • Potosi District
    		Rocks & Minerals, Nov. 1999
    NBMG Spec. Pub. 31 Minerals of Nevada
    Min News (1999) 15:6 pp 1,5-8
      • Nye Co.
        • Northumberland District
    		NBMG Spec. Pub. 31 Minerals of Nevada
      • Pershing Co.
        • Willard District
    		NBMG Spec. Pub. 31 Minerals of Nevada
    • North Carolina
      • Cleveland Co.
        • Kings Mountain District
    		Rocks and Minerals, (1985) 60:76-82
    • South Dakota
      • Custer Co.
        • Custer District
          • Fourmile
    		Rocks & Minerals: 60: 117. ; Mineralogical Record 14 (3): 195-197.
          • Pringle
            • Cicero Peak
    		Rocks & Minerals: 75(3): 156-169.
      • Lawrence Co.
        • Lead District
    		Loomis, T. (2011), "News from the Black Hills, South Dakota", Mineral News, in press
        • Keystone District
          • Keystone
    		Rocks & Minerals: 57: 160 &/or 60: 110 & 112.
    • Utah
      • Box Elder Co.
        • Pilot Range
          • Lucin District
            • Lucin
    		Don Howard (1999) Montgomeryite. Microprobe 8-10:11-13
      • Utah Co.
        • Oquirrh Mts
          • Fairfield
    		Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 958, 979; UGMS Bull 117 Minerals and Mineral Localities of Utah
    Wilson, W. (2010): The Clay Canyon Variscite Mine, Fairfield Utah. Mineralogical Record. 41:321-349.
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