Mineralogy Database

Perhamite Mineral Data

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General Perhamite Information

Help on Chemical  Formula: Chemical Formula: Ca3Al7(SiO4)3(PO4)4(OH)3•16.5(H2O)
Help on Composition: Composition: Molecular Weight = 1,313.51 gm
   Calcium      9.15 %  Ca   12.81 % CaO
   Aluminum    14.38 %  Al   27.17 % Al2O3
   Silicon      6.41 %  Si   13.72 % SiO2
   Phosphorus   9.43 %  P    21.61 % P2O5
   Hydrogen     2.76 %  H    24.69 % H2O
   Oxygen      57.86 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca3Al7(SIO4)3(PO4)4(OH)3•16.5(H2O)
Help on Environment: Environment: Found in a pegmatite vug.
Help on IMA Status: IMA Status: Approved IMA 1977
Help on Locality: Locality: Bell Pit, Newry Hill, Newry, Maryland, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Frank C. Perham (1934-), U.S. Geologist and pegmatite miner.
Help on Name Pronunciation: Name Pronunciation: Perhamite + Pronunciation Say PERHAMITE

Perhamite Image

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Comments: Squat, columnar perhamite crystals on matrix.
Location: Emmons quarry, Greenwood, Oxford County, Maine, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Perhamite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.87891
Help on Cell Dimensions: Cell Dimensions: a = 7.02, c = 20.21, Z = 1; V = 862.52 Den(Calc)= 2.53
Help on Crystal System: Crystal System: Hexagonal - Dihexagonal Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P 6/mmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.882(1), 5.8(0.71), 6.08(0.5),

Physical Properties of Perhamite

Help on Cleavage: Cleavage: {0001} Perfect
Help on Color: Color: Light brown, White.
Help on Density: Density: 2.64
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Perhamite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.081 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.041 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2255,KPDmeas= 0.2161,KC= 0.2352
Ncalc = 1.59 - 1.62
Help on Optical Data: Optical Data: Uniaxial (+), w=1.564, e=1.577, bire=0.0130.

Calculated Properties of Perhamite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.58 gm/cc
note: Specific Gravity of Perhamite =2.53 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0034010485
Boson Index = 0.9965989515
Help on Photoelectric: Photoelectric: PEPerhamite = 2.28 barns/electron
U=PEPerhamite x rElectron Density= 5.87 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Perhamite is Not Radioactive

Perhamite Classification

Help on  Dana Class: Dana Class: (43)Compound Phosphates, etc.
  (43.05)(Hydrated Compound Anions With Hydroxyl or Halogen)
  (43.05.10)Dana Group Perhamite Ca3Al7(SiO4)3(PO4)4(OH)3•16.5(H2O) P 6/mmm 6/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 08.DO.20 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DO -With CO3, SO4, SiO4
08.DO.20 Perhamite Ca3Al7(SiO4)3(PO4)4(OH)3•16.5(H2O) P 6/mmm 6/m 2/m 2/m

Other Perhamite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Perhamite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 08.DO.20





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