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Perhamite

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Formula:
Ca3Al7.7Si3P4O23.5(OH)14.1 · 8H2O
System:
Trigonal
Colour:
Colourless, white, light ...
Hardness:
5
Member of:
Name:
Named for Frank Croydon Perham (b. 1934).
Structurally related to crandallite but not a member of the Crandallite Group.

Visually similar to various crandallite-group minerals and iangreyite. See also krásnoite, the fluorophosphate analogue of perhamite.


Classification of Perhamite

Approved
8.DO.20

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

43 : COMPOUND PHOSPHATES, ETC.
5 : Hydrated Compound Phosphates, etc·, Containing Hydroxyl or Halogen
17.6.2

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

General Appearance of First Recorded Material:
Rosettes of pseudo-hexagonal plates; also earthy.
Place of Conservation of First Recorded Material:
National History Museum, London - 1976,424; Smithsonian 135740
Year of Discovery:
1977
Geological Setting of First Recorded Material:
Originally from late stage mineralization in granite pegmatite. Subsequently found in oxidized zones of ore deposits.

Physical Properties of Perhamite

Vitreous, Sub-Vitreous, Pearly
Diaphaneity (Transparency):
Transparent, Translucent
Comment:
Vitreous on cleavage
Colour:
Colourless, white, light brown, orange
Streak:
white
Hardness (Mohs):
5
Tenacity:
Very brittle
Cleavage:
Imperfect/Fair
Imperfect on {0001}
Density:
2.64 g/cm3 (Measured)    2.53 g/cm3 (Calculated)

Crystallography of Perhamite

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
P3m1
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)
Morphology:
Spherulitic masses of platy crystals.
X-Ray Powder Diffraction Data:
d-spacingIntensity
6.71 (40)
6.08 (50)
5.80 (70)
3.51 (50)
3.12 (50)
3.01 (40)
2.88 (100)
1.76 (50)
Comments:
The powder diffraction pattern showed a close resemblance to that of iangreyite.

Optical Data of Perhamite

Type:
Uniaxial (+)
RI values:
nω = 1.564() nε = 1.577(4)
Max Birefringence:
δ = 0.013
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r > v moderate

Chemical Properties of Perhamite

Formula:
Ca3Al7.7Si3P4O23.5(OH)14.1 · 8H2O
Essential elements:
All elements listed in formula:
Common Impurities:
Ti,Fe,Mg,Na,F

Relationship of Perhamite to other Species

Member of:
Other Members of Group:
KrásnoiteCa3Al7.7Si3P4O23.5(OH)12.1F2 · 8H2O
Chemically related to group(s):
8.DO.05GirvasiteNaCa2Mg3(PO4)2(H2PO4)(CO3)(OH)2 · 4H2O
8.DO.10VoggiteNa2Zr(PO4)(CO3)(OH) · 2H2O
8.DO.15PeisleyiteNa2Al9[(P,S)O4]8(OH)6•28H2O
8.DO.20KrásnoiteCa3Al7.7Si3P4O23.5(OH)12.1F2 · 8H2O
8.DO.25Saryarkite-(Y)Ca(Y,Th)Al5(SiO4)2(PO4,SO4)2(OH)7 · 6H2O
8.DO.30Micheelsenite(Ca,Y)3Al(HPO4,CO3)(CO3)(OH)6 · 12H2O
8.DO.40Parwanite(Na,K)(Mg,Ca)4Al8(PO4)8(CO3)(OH)7 · 30H2O
8.DO.45SkorpioniteCa3Zn2(PO4)2(CO3)(OH)2 · H2O
17.6.1NagelschmidtiteCa7(SiO4)2(PO4)2
17.6.3Viséite
17.6.4Phosinaite
17.6.5ClinophosinaiteNa12(Ca,Sr)4(Si4O12)(PO4)4
17.6.6Karnasurtite-(Ce)(Ce,La,Th)(Ti,Nb)(Al,Fe)(Si2O7)(OH)4 · 3H2O
17.6.7LomonosoviteNa5Ti2(Si2O7)(PO4)O2
17.6.8BornemaniteNa6BaTi2Nb(Si2O7)2(PO4)O2(OH)F
17.6.9SoboleviteNa13Ca2Mn2Ti3(Si2O7)2(PO4)4O3F3
17.6.10Laplandite-(Ce)Na4CeTiPO4Si7O18 · 5H2O
17.6.11 VunonnemiteNa5TiNb3Si6O25F2 · 2Na3PO4
17.6.12Saryarkite-(Y)Ca(Y,Th)Al5(SiO4)2(PO4,SO4)2(OH)7 · 6H2O
17.6.13Steenstrupine-(Ce)Na14Mn22+(Fe3+,Mn3+)2Ce6(Zr,Th)(Si6O18)2(PO4)6(HPO4)(OH)2 · 2H2O
17.6.14WaylanditeBiAl3(PO4)2(OH)6
17.6.15Britholite-(Ce)Ca2(Ce,Ca)3(SiO4,PO4)3(OH,F)
17.6.16Britholite-(Y)Ca2(Y,Ca)3(SiO4,PO4)3(OH,F)
17.6.17EylettersiteTh0.75Al3(PO4)2(OH)6

Other Names for Perhamite

Name in Other Languages:
German:Perhamit
Spanish:Perhamita

Other Information

Health Risks:
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 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

Localities for Perhamite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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
      • North 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. ; Francis, G.L., Peisley, V., 2012. Minerals from Penrice quarry and the phosphate deposits Klemms and St Kitts, Angaston, South Australia. (self published).
        • Kapunda
Francis, G.L., Peisley, V., 2012. Minerals from Fairview and St John's phosphate deposits, South Australia. (self published).
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)
        • Wolfsberg
H.Wippel, Spittal
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Karlovy Vary Region
      • Aš (Asch)
Breiter K., Škoda R., Veselovský F.: Neobvyklý P-, Li- a Sn-bohatý pegmatit z Vernéřova u Aše, Česká republika. Bulletin Mineralogicko-petrografického oddělení Národního muzea v Praze, 2009, roč. 17, č. 1, s. 41-59.
    • South Bohemia Region
      • Písek
Sejkora J., Cícha J., Jebavá I.: Minerální asociace fosfátů z Čížové u Písku (Česká republika). Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 2011, 19, 1, 1-26.
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
Norway
 
  • Østfold
    • Halden
      • Idd
        • Aspedammen
Kristiansen, R. (2014): Nye mineralfunn fra Herrebøkasa, Aspedammen, Østfold. Stein. 41 (3),30-33
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 Mountain
Rocks and Minerals (1980) 55:209-213; Mineral News (1991) 7:3 pp6,7,10
      • 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
            • Utahlite Hill
Joe Marty, Donald G. Howard, Henry Barwood (1999) Minerals of the Utahlite Claim, Lucin, Box Elder County, Utah. Utah Geological Survey Miscellaneous Publication 99-6.
Mineral and/or Locality  
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