Palermoite Mineral Data

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General Palermoite Information

Chemical Formula:

(Sr,Ca)(Li,Na)2Al4(PO4)4(OH)4

Composition:

Molecular Weight = 653.48 gm

Sodium 1.76 % Na 2.37 % Na₂O

Strontium 10.06 % Sr 11.89 % SrO

Lithium 1.59 % Li 3.43 % Li₂O

Calcium 1.53 % Ca 2.15 % CaO

Aluminum 16.52 % Al 31.21 % Al₂O₃

Phosphorus 18.96 % P 43.44 % P₂O₅

Hydrogen 0.62 % H 5.51 % H₂O

Oxygen 48.97 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Sr_0.75Ca_0.25Li_1.5Na_0.5Al₄(PO₄)₄(OH)₄

Environment:

In cavities in a pegmatite.

IMA Status:

Valid Species (Pre-IMA) 1952

Locality:

Palermon No. 1 mine, North Groton, New Hampshire, USA. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Palermoite + Pronunciation

Synonym:

ICSD 4262

PDF 18-950

Palermoite Image

Images:

Palermoite

Comments: Less than 1cm, vug with micro crystals of palermoite.
Location: Palermo mine, New Hampshire, USA. Scale: Picture size 0.5 cm.
© John Veevaert

Palermoite Crystallography

Axial Ratios:

a:b:c =0.4615:1:0.7291

Cell Dimensions:

a = 7.315, b = 15.849, c = 11.556, Z = 4; V = 1,339.75 Den(Calc)= 3.24

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: I mmm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.089(1), 4.36(0.64), 3.129(0.6),

Forms:

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Forms: ( 1 1 0) ( 0 1 0) ( 1 1 1) ( 0 1 1) ( 0 0 1)

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Crystal Structure:

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Moore P B , Araki T , American Mineralogist , 60 (1975) p.460-465, Palermoite, SrLi2[Al4(OH)4(PO4)4]: Its atomic arrangement and relationship to, carminite, Pb2[Fe4(OH)4(AsO4)4]

Physical Properties of Palermoite

Cleavage:

{100} Perfect, {001} Distinct

Color:

Colorless, White.

Density:

3.22

Diaphaneity:

Transparent

Fracture:

Brittle - Splintery - Brittle fracture leaving splintery fragments.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

5.5 - Knife Blade

Luminescence:

Fluorescent, Short UV=white in direct x-ray beam.

Luster:

Vitreous - Adamantine

Streak:

white

Optical Properties of Palermoite

Gladstone-Dale:

CI meas= 0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1968,KPDmeas= 0.198,KC= 0.1996
Ncalc = 1.64 - 1.65

Optical Data:

Biaxial (-), a=1.627, b=1.642, g=1.644, bire=0.0170, 2V(Calc)=38, 2V(Meas)=20.

Calculated Properties of Palermoite

Electron Density:

Bulk Density (Electron Density)=3.15 gm/cc
note: Specific Gravity of Palermoite =3.22 gm/cc.

Fermion Index:

Fermion Index = 0.0084908828
Boson Index = 0.9915091172

Photoelectric:

PE_Palermoite= 12.51 barns/electron
U=PE_Palermoite x rElectron Density= 39.39 barns/cc.

Radioactivity:

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

Palermoite Classification

Dana Class:

41.07.01.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.07)where (A B)m (XO4)4 Zq

(41.07.01)Palermoite Group

41.07.01.01 Palermoite (Sr,Ca)(Li,Na)2Al4(PO4)4(OH)4 I mmm 2/m 2/m 2/m

41.07.01.02 Bertossaite Li2CaAl4(PO4)4(OH)4 Imaa,Iaa2 Ortho

Strunz Class:

08.BH.25 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BH -With medium-sized and large cations, (OH,etc.):RO4 = 1:1

08.BH.25 Bertossaite Li2CaAl4(PO4)4(OH)4 Imaa,Iaa2 Ortho

08.BH.25 Palermoite (Sr,Ca)(Li,Na)2Al4(PO4)4(OH)4 I mmm 2/m 2/m 2/m

Other Palermoite 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 Palermoite :
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
15 - WWW-MINCRYST

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Ask about Palermoite here :
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Mindat.org's Discussion Groups
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Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Palermoite

(Sr,Ca)(Li,Na)2Al4(PO4)4(OH)4
Dana No: 41.07.01.01 Strunz No: 08.BH.25
Locality:

Notes: