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Perhamite

A valid IMA mineral species
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EditAdd SynonymEdit CIF structuresClear Cache
Ca3Al7.7Si3P4O23.5(OH)14.1 · 8H2O
Colour:
Colourless, white, light brown, yellow, orange
Lustre:
Vitreous, Sub-Vitreous, Pearly
Hardness:
5
Specific Gravity:
2.64
Crystal System:
Trigonal
Member of:
Perhamite Group
Name:
Named in honor of Frank Croydon Perham (5 March 1934 - January 31, 2023), geologist and pegmatite miner of West Paris, Maine, USA, in honor and recognition of his dedicated labors in the recovery of mineral specimens.
Co-Type Localities:
ⓘBell pit, Newry, Oxford County, Maine, USA
ⓘDunton Gem Quarry, Newry, Oxford County, Maine, USA
Structurally related tocrandallite but not a member of thePlumbogummite Group.

Visually similar to various crandallite-group minerals andiangreyite. See alsokrásnoite, a mineral closely related toperhamite.

Stands for a precursor for iangreyite, via selective leaching of layer-contained silica followed by layers rejoining via coalescence of the AlO4 tetrahedra from the adjacent layers into trigonal bypiramids of the AlO2(OH)3 composion (Keck et al., 2022).



Unique Identifiers
IMA Formula:
Ca3Al7.7Si3P4O23.5(OH)14.1 · 8H2O
First published:
1977
Type description reference:
Dunn, Pete J., Appleman, Daniel E. (1977) Perhamite, a new calcium aluminum silico-phosphate mineral, and a re-examination of viséite.Mineralogical Magazine, 41 (320) 437-442doi:10.1180/minmag.1977.041.320.03

Classification of Perhamite

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

Mineral SymbolsJolyon RalphUnited Kingdom

Physical Properties of Perhamite
Transparency:
Transparent, Translucent
Comment:
Vitreous on cleavage
Colour:
Colourless, white, light brown, yellow, orange
Streak:
White
Hardness:
5 onMohs scale
Tenacity:
Very brittle
Cleavage:
Imperfect/Fair
Imperfect on {0001}
Density:
2.64 g/cm3 (Measured)    2.53 g/cm3 (Calculated)

Optical Data of Perhamite
Surface Relief:
Moderate
Dispersion:
r > v moderate

Chemistry of Perhamite
Common Impurities:
Ti,Fe,Mg,Na,F

Crystallography of Perhamite
General Appearance of Type Material:
Rosettes of pseudo-hexagonal plates; also earthy.
Place of Conservation of Type Material:
The Natural History Museum, London, England number 1976,424.
National Museum of Natural History, Washington, D.C., USA, number 135740, 143393.
Geological Setting of Type Material:
Originally from late stage mineralization in granite pegmatite. Subsequently found in oxidized zones of ore deposits.
Associated Minerals at Type Locality:
AmblygoniteEosphoriteSideriteSphaleriteWardite
Reference:
Dunn, Pete J., Appleman, Daniel E. (1977) Perhamite, a new calcium aluminum silico-phosphate mineral, and a re-examination of viséite.Mineralogical Magazine, 41 (320) 437-442doi:10.1180/minmag.1977.041.320.03

Synonyms of Perhamite

Other Language Names for Perhamite

Relationship of Perhamite to other Species
Other Members of Perhamite Group:
KrásnoiteCa3Al7.7Si3P4O23.5(OH)12.1F2 · 8H2OTrig.3m(32/m) :P3m1
Chemically related to group(s):
Plumbogummite GroupA subgroup of theAlunite Supergroup.

Common AssociatesMon. 2/m :B2/m8.DO.05GirvasiteNaCa2Mg3(PO4)3(CO3)(H2O)6Mon. 2/m :P21/b8.DO.10VoggiteNa2Zr(PO4)(CO3)(OH) · 2H2OMon. 2/m8.DO.15PeisleyiteNa2Al9[(P,S)O4]8(OH)6 · 28H2OTric. 1 :P18.DO.20KrásnoiteCa3Al7.7Si3P4O23.5(OH)12.1F2 · 8H2OTrig.3m(32/m) :P3m18.DO.25Saryarkite-(Y)Ca(Y,Th)Al5(SiO4)2(PO4,SO4)2(OH)7 · 6H2OTet. 4228.DO.30Micheelsenite(Ca2Y)Al(PO3OH)(CO3)(OH)6 · 12H2OHex. 6 :P638.DO.40Parwanite(Na,K)(Mg,Ca)4Al8(PO4)8(CO3)(OH)7 · 30H2OMon. 2 :P28.DO.45SkorpioniteCa3Zn2(PO4)2(CO3)(OH)2 · H2OMon. 2/m :B2/b8.DO.50Jörgkellerite(Na,◻)3Mn3+3(PO4)2(CO3)(O,OH)2 · 5H2OTrig.3 :P38.DO.55JuansilvaiteNa5Al3[AsO3(OH)]4[AsO2(OH)2]2(SO4)2 · 4H2OMon. 2/m :B2/b8.DO.60VanderheydeniteZn6(PO4)2(SO4)(OH)4 · 7H2OMon. 2/m

Fluorescence of Perhamite

Other Information
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    • References for PerhamiteⓘMoculta Phosphate QuarryMills (2003)Francis et al. (self published)+2 other referencesMills (2003)Francis et al. (2012)
    Austria
     
    Niedermayr et al. (2005)H.Wippel
    Bolivia
     
    Anatoly Kasatkin analysis on Richie ...+1 other reference
    Czech Republic
     
    Breiter K.Sejkora et al. (2011)
    France
     
    54 (in German)+1 other reference
    Germany
     
    Keck et al. (2022)Wittern (2001)
    Norway
     
    Kristiansen (2014)
    Russia
     
    ...
    Spain
     
    Rosell-Riba et al. (2022)Bosch+6 other references
    USA
     
    Roberts et al. (2003)King (2000)Rocks and Minerals (1980)+4 other referencesFound Oct 2021 and optically studied. ...Dunn et al. (1977)+2 other referencesDunn et al. (1977)www.mindat.org (2004)+1 other referenceKing (2000)+1 other referenceE.L. Clopton collectionDr. William S. Wise presentation to ...Tom Mortimer collection (EDS- and PXRD-analysed)Thomas Loomis CollectionJoe Marty et al. (1999)
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