Perhamite Mineral Data

General Perhamite Information

Chemical Formula:

Ca3Al7(SiO4)3(PO4)4(OH)3•16.5(H2O)

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

Empirical Formula:

Ca₃Al₇(SIO4)₃(PO₄)₄(OH)₃•16.5(H₂O)

Environment:

Found in a pegmatite vug.

IMA Status:

Approved IMA 1977

Locality:

Bell Pit, Newry Hill, Newry, Maryland, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Frank C. Perham (1934-), U.S. Geologist and pegmatite miner.

Name Pronunciation:

Perhamite + Pronunciation

Perhamite Image

Images:

Perhamite

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

Axial Ratios:

a:c = 1:2.87891

Cell Dimensions:

a = 7.02, c = 20.21, Z = 1; V = 862.52 Den(Calc)= 2.53

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/I_o): 2.882(1), 5.8(0.71), 6.08(0.5),

Physical Properties of Perhamite

Cleavage:

{0001} Perfect

Color:

Light brown, White.

Density:

2.64

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Perhamite

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

Optical Data:

Uniaxial (+), w=1.564, e=1.577, bire=0.0130.

Calculated Properties of Perhamite

Electron Density:

Bulk Density (Electron Density)=2.58 gm/cc
note: Specific Gravity of Perhamite =2.53 gm/cc.

Fermion Index:

Fermion Index = 0.0034010485
Boson Index = 0.9965989515

Photoelectric:

PE_Perhamite= 2.28 barns/electron
U=PE_Perhamite x rElectron Density= 5.87 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Perhamite is Not Radioactive

Perhamite Classification

Dana Class:

43.05.10.01 (43)Compound Phosphates, etc.

(43.05)(Hydrated Compound Anions With Hydroxyl or Halogen)

(43.05.10)Dana Group

43.05.10.01 Perhamite Ca3Al7(SiO4)3(PO4)4(OH)3•16.5(H2O) P 6/mmm 6/m 2/m 2/m

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

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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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Print or Cut-and-Paste your Perhamite Specimen Label here :

Perhamite

Ca3Al7(SiO4)3(PO4)4(OH)3•16.5(H2O)
Dana No: 43.05.10.01 Strunz No: 08.DO.20
Locality:

Notes:

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