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Natropalermoite

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Formula:
Na2SrAl4(PO4)4(OH)4
Colour:
Colourless
Lustre:
Vitreous
Hardness:
Specific Gravity:
3.502 (Calculated)
Crystal System:
Orthorhombic
Name:
Named for being the sodium analogue of palermoite. The root name is for the type locality of the Palermo #1 Mine, USA.
The Na-analogue of palermoite. The element combination is to some extent shared with bøggildite and arrojadite-(SrFe).

Visually indistinguishable from palermoite.

Although isostructural with palermoite, having Li substitution for Na leads to a substantial increase of the b parameter. The VIINa-bearing polyhedron is more regular than the corresponding one in palermoite.


Hide all sections | Show all sections

Classification of NatropalermoiteHide

Approved
Approval Year:
2013
First Published:
2017

Physical Properties of NatropalermoiteHide

Vitreous
Transparency:
Transparent
Colour:
Colourless
Streak:
White
Hardness:
5½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
on {001}; also fair on {100}
Parting:
Not observed
Fracture:
Sub-Conchoidal
Density:
3.502 g/cm3 (Calculated)

Optical Data of NatropalermoiteHide

Type:
Biaxial (-)
RI values:
nα = 1.624(1) nβ = 1.641(1) nγ = 1.643(1)
2V:
Measured: 43° (4), Calculated: 38°
Max Birefringence:
δ = 0.019
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of NatropalermoiteHide

Formula:
Na2SrAl4(PO4)4(OH)4

Crystallography of NatropalermoiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 11.4849(6) Å, b = 16.2490(7) Å, c = 7.2927(4) Å
Ratio:
a:b:c = 0.707 : 1 : 0.449
Unit Cell V:
1360.95 ų
Z:
4
Morphology:
Prismatic crystals with striations parallel to the direction of elongation up to 200 x 50 x 45 μm in size
Comment:
Imcb

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.907Å(68)
4.689Å(45)
3.327Å(48)
3.128Å(100)
3.078Å(45)
2.636Å(35)
2.453Å(38)
2.174Å(35)
Comments:
From Type Description.

Type Occurrence of NatropalermoiteHide

General Appearance of Type Material:
Prismatic crystals, up to 200 x 50 x 45 μm, striated parallel to the direction of elongation (i.e., the a axis)
Place of Conservation of Type Material:
Type material is deposited in the collections of the Mineral Museum of the University of Arizona, Tucson, Arizona, USA, catalogue number 19735, and the RRUFF Project, deposition number R130092
Empirical Formula of Type Material:
(Na1.69Li0.31)Σ2.00(Sr0.95Mg0.04Ca0.02Ba0.01)Σ1.02(Al3.82Mn0.03Fe0.03)Σ3.88(P1.01O4)4(OH)4
Associated Minerals at Type Locality:
Reference:
Schumer, B.N., Yang, H., Downs, R.T. (2017) Natropalermoite, Na2SrAl4(PO4)4(OH)4, a new mineral isostructural with palermoite, from the Palermo No. 1 mine, Groton, New Hampshire, USA. Mineralogical Magazine: 81: 833-840.

Synonyms of NatropalermoiteHide

Relationship of Natropalermoite to other SpeciesHide

Other Members of this group:
Bertossaite(Li,Na)2(Ca,Fe2+,Mn2+)Al4(PO4)4(OH,F)4Orth.
Palermoite(Li,Na)2(Sr,Ca)Al4(PO4)4(OH)4Orth.

Other InformationHide

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 NatropalermoiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Schumer, B.N., Yang, H. and Downs, R.T. (2014) Natropalermoite, IMA 2013-118. CNMNC Newsletter No. 19, February 2014, page 170. Mineralogical Magazine: 78: 165-170.
Schumer, B.N., Yang, H., Downs, R.T. (2016) Natropalermoite, Na2SrAl4(PO4)4(OH)4, a new mineral isostructural with palermoite, from the Palermo No. 1 mine, Groton, New Hampshire, USA. Mineralogical Magazine: 81: 833-840.

Internet Links for NatropalermoiteHide

Localities for NatropalermoiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
USA (TL)
 
  • New Hampshire
    • Grafton Co.
      • Groton
Schumer, B.N., Yang, H. and Downs, R.T. (2014) Natropalermoite, IMA 2013-118. CNMNC Newsletter No. 19, February 2014, page 170; Mineralogical Magazine, 78, 165-170; Schumer, B.N., Yang, H., Downs, R.T. (2017): Natropalermoite, Na2SrAl4(PO4)4(OH)4, a new mineral isostructural with palermoite, from the Palermo No. 1 mine, Groton, New Hampshire, USA. Mineralogical Magazine, 81, 833-840.
 
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