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Perhamite

Big Photo

Emmons Quarry (Uncle Tom Mt. Quarry), Uncle Tom Mt, Greenwood, Oxford Co., Maine, USA
© Dick Dionne

Show Perhamite Photos (13)
Formula:
(Ca,Sr)
 
3
Al
 
7.7
Si
 
3
P
 
4
O
 
23.5
(OH)
 
14.1
·8H
 
2
O
System:TrigonalColour:Colourless, white, light ...
Hardness:5
Name:Named for Frank Croydon Perham [b. 1934]


Structurally related to crandallite but not a member of the Crandallite Group.

Classification of Perhamite

IMA status:Approved
Strunz 8th edition ID:8/J.20-10
Nickel-Strunz 10th (pending) edition ID:8.DO.20

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
O : With CO3, SO4, SiO4
Dana 8th edition ID:43.5.10.1

43 : COMPOUND PHOSPHATES, ETC.
5 : Hydrated Compound Phosphates, etc·, Containing Hydroxyl or Halogen
Hey's CIM Ref.:17.6.2

17 : Silicates Containing other Anions
6 : Silicates with phosphate
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Type Occurrence of Perhamite

Co-type Localities:Bell Pit (Bell Quarry), Newry, Oxford Co., Maine, USA
Dunton Gem Quarry, Newry, Oxford Co., Maine, USA
General Appearance of Type Material:Rosettes of pseudo-hexagonal plates; also earthy.
Year of Discovery:1977
Geological Setting of type material:Originally from late stage mineralization in granite pegmatite. Subsequently found in oxidized zones of ore deposits.

Physical Properties of Perhamite

Lustre:Vitreous, Sub-Vitreous, Pearly
Diaphaneity (Transparency):Transparent, Translucent
Colour:Colourless, white, light brown, orange
Streak:white
Hardness (Mohs):5
Tenacity:Very brittle

Crystallography of Perhamite

Crystal System:Trigonal
Class (H-M):3m (3 2/m) - Hexagonal Scalenohedral
Space Group:P3m1 {P3 2/m 1}
Cell Parameters:a = 7.021Å, c = 20.218Å
Ratio:a:c = 1 : 2.88
Unit Cell Volume:V 863.11 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
d-spacingIntensity
6.71 (40)
6.08 (50)
5.80 (70)
3.51 (50)
3.12 (50)
3.01 (40)
2.88 (100)

Optical Data of Perhamite

Type:Uniaxial (+)
RI values: nω = 1.564 nε = 1.577
Maximum Birefringence:δ = 0.013

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low

Chemical Properties of Perhamite

Formula:
(Ca,Sr)
 
3
Al
 
7.7
Si
 
3
P
 
4
O
 
23.5
(OH)
 
14.1
·8H
 
2
O
Essential elements:Al, Ca, H, O, P, Si
All elements listed in formula:Al, Ca, H, O, P, Si, Sr
Common Impurities:Ti,Fe,Mg,Na,F

Relationship of Perhamite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.DO.05Girvasite
NaCa
 
2
Mg
 
3
[(OH)
 
2
|CO
 
3
|H
 
2
PO
 
4
|(PO
 
4
)
 
2
] · 4H
 
2
O
8.DO.10Voggite
Na
 
2
Zr[OH|CO
 
3
|PO
 
4
] · 2H
 
2
O
8.DO.15Peisleyite
Na
 
3
Al
 
16
[SO
 
4
|(PO
 
4
)
 
5
]
 
2
 · 20H
 
2
O
8.DO.25Saryarkite-(Y)
Ca(Y,Th)Al
 
5
(SiO
 
4
)
 
2
(PO
 
4
,SO
 
4
)
 
2
(OH)
 
7
·6H
 
2
O
8.DO.30Micheelsenite
(Ca,Y)
 
3
Al(PO
 
3
OH,CO
 
3
)(CO
 
3
)(OH)
 
6
·12H
 
2
O
8.DO.40Parwanite
(Na,K)(Mg,Ca)
 
4
Al
 
8
(PO
 
4
)
 
8
(CO
 
3
)(OH)
 
7
·30H
 
2
O
8.DO.45Skorpionite
Ca
 
3
Zn
 
2
[(OH)
 
2
|CO
 
3
|(PO
 
4
)
 
2
] · H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
17.6.1Nagelschmidtite
Ca
 
7
[PO
 
4
|SiO
 
4
]
 
2
17.6.3Viséite
17.6.4Phosinaite
17.6.5Clinophosinaite
Na
 
12
(Ca,Sr)
 
4
(PO
 
4
)
 
4
(Si
 
4
O
 
12
)
17.6.6Karnasurtite-(Ce)
(Ce,La,Th)(Ti,Nb)(Al,Fe)(Si,P)
 
2
O
 
7
(OH)
 
4
·3H
 
2
O
17.6.7Lomonosovite
Na
 
5
Ti
 
2
[O
 
2
|PO
 
4
|Si
 
2
O
 
7
]
17.6.8Bornemanite
Na
 
6
[]BaTi
 
2
Nb(Si
 
2
O
 
7
)
 
2
(PO
 
4
)O
 
2
(OH)F
17.6.9Sobolevite
Na
 
12
Ca(NaCaMn)Ti
 
2
(Si
 
2
O
 
7
)
 
2
(PO
 
4
)
 
4
O
 
3
F
 
3
17.6.10Laplandite-(Ce)
Na
 
4
CeTiPO
 
4
Si
 
7
O
 
18
·5H
 
2
O
17.6.11 Vunonnemite
Na
 
5
TiNb
 
3
Si
 
6
O
 
25
F
 
2
·2Na
 
3
PO
 
4
17.6.12Saryarkite-(Y)
Ca(Y,Th)Al
 
5
(SiO
 
4
)
 
2
(PO
 
4
,SO
 
4
)
 
2
(OH)
 
7
·6H
 
2
O
17.6.13Steenstrupine-(Ce)
Na
 
14
Mn
2+
2
(Fe
3+
 
,Mn
3+
 
)
 
2
Ce
 
6
(Zr,Th)[(OH)
 
2
|HPO
 
4
|(PO
 
4
)
 
6
|(Si
 
6
O
 
18
)
 
2
]·2H
 
2
O
17.6.14Waylandite
(Bi,Ca)Al
 
3
[(OH)
 
6
|(PO
 
4
,SiO
 
4
)
 
2
]
17.6.15Britholite-(Ce)
Ca
 
2
(Ce,Ca)
 
3
[(OH,F)|(SiO
 
4
,PO
 
4
)
 
3
]
17.6.16Britholite-(Y)
Ca
 
2
(Y,Ca)
 
3
[(OH,F)|(SiO
 
4
,PO
 
4
)
 
3
]
17.6.17Eylettersite
(Th,Pb)Al
 
3
[(OH)
 
6
|(PO
 
4
,SiO
 
4
)
 
2
] ?

Other Names for Perhamite

Synonyms:
IMA1975-019
Other Languages:
German:Perhamit
Spanish:Perhamita

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 Perhamite

Reference List:Dunn, P. and Appleman, D., 1977, Perhamite, a New Calcium Aluminum Silico-phosphate Mineral and a Re-examination of Viseite, Mineralogical Magazine (1977): 41: 437-442.

American Mineralogist (1978): 63: 794.

Mills, S. J. (2003) A note on perhamite from the Moculta (Klemms) phosphate quarry, South Australia, Australian Journal of Mineralogy, 9 (1), 43–5.

Mills, S., Mumme, G., Grey, I. and Bordet, P. (2006): The crystal structure of perhamite. Mineralogical Magazine: 70: 201-209.

Internet Links for Perhamite

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  • Raman and XRD data at RRUFF project
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  • Perhamite details from Handbook of Mineralogy (PDF)
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    Localities for Perhamite

    Hide Locality List
    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.
    (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
     
    • South Australia
      • Mt Lofty Ranges
        • South Mt Lofty Ranges
          • Barossa Valley
            • Angaston
    		Mills, S. J. (2003): A note on perhamite from the Moculta (Klemms) phosphate quarry, South Australia. Austral. J. Mineral. 9, 43-45.
    Mills, S. J. (2003): A note on perhamite from the Moculta (Klemms) phosphate quarry, South Australia. Austral. J. Mineral. 9, 43-45.
          • Kapunda
    		Mills, S. J. (2003): A note on perhamite from the Moculta (Klemms) phosphate quarry, South Australia. Austral. J. Mineral. 9, 43-45.
    Austria
     
    • Carinthia
      • Millstatt lake ridge
        • Spittal
          • Millstatt lake
    		Niedermayr, G. & Brandstätter, F. (2005)
    France
     
    • Auvergne
      • Allier
        • Ébreuil
          • Échassières
    		Kolitsch, U., Gröbner, J. & Brandstätter, F. (2009): Neufunde von Les Montmins, Allier, Frankreich. Lapis 34 (11), 24-32; 54 (in German).
    Germany
     
    • North Rhine-Westphalia
      • Sauerland
        • Sundern
          • Hellefeld
    		Wittern: "Mineralfundorte in Deutschland", 2001
    USA
     
    • Arkansas
      • Pike Co.
    		Roberts, A.C. et al (2003), The Canadian Mineralogist: 41(3): 721-725.
    • Maine
      • Oxford Co.
        • Greenwood
    		King, V. and Foord, E., 2000, Mineralogy of Maine, volume 2.
          • Uncle Tom Mt
    		No reference listed
        • Newry
    		King, V. and Foord, E., 1994, Mineralogy of Maine, V. 1; King, V. (ed.), 2000, Mineralogy of Maine, V. 2.
    Mineralogical Magazine 41,437-442(1977)
        • West Paris
    		King, V.T. (2000) Mineralogy of Maine; Volume 2: Mining History, Gems & Geology, Maine Geological Survey
    • Nevada
      • Humboldt Co.
        • Iron Point District
          • Valmy
    		Dr. William S. Wise presentation to Northwest Micro Mineral Study Group on 1 May 2004, Update on Mineralogy of the Silver Coin Mine, Iron Point District, Edna Mountains, Humboldt Co., Nevada
    • Utah
      • Box Elder Co.
        • Pilot Range
          • Lucin District
            • Lucin
    Mineral and/or Locality
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