Natropalermoite (original) (raw)

A valid IMA mineral species

Formula:

Na2SrAl4(PO4)4(OH)4

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.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:46065:1

IMA Classification of NatropalermoiteHide

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Type description reference:

Schumer, Benjamin N., Yang, Hexiong, Downs, Robert 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 (4) 833-840 doi:10.1180/minmag.2016.080.133

Classification of NatropalermoiteHide

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8.BH.25

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
H : With medium-sized and large cations, (OH,etc.):RO4 = 1:1

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of NatropalermoiteHide

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Comment:

Hardness not measured. Prob 5.5 by analogy to palermoite.

Cleavage:

Perfect
on {001}; also fair on {100}

Fracture:

Sub-Conchoidal, Fibrous

Density:

3.502 g/cm3 (Calculated)

Comment:

Density not measured due to lack of material.

Optical Data of NatropalermoiteHide

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RI values:

_n_α = 1.624(1) _n_β = 1.641(1) _n_γ = 1.643(1)

2V:

Measured: 43° (4), Calculated: 38°

δ = 0.019

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Dispersion:

Medium to weak, v > r.

Chemistry of NatropalermoiteHide

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Mindat Formula:

Na2SrAl4(PO4)4(OH)4

Crystallography of NatropalermoiteHide

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Crystal System:

Orthorhombic

Class (H-M):

m m m _(_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

Morphology:

Prismatic crystals with striations parallel to the direction of elongation up to 200 x 50 x 45 μm in size

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

From Type Description.

Geological EnvironmentHide

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Type Occurrence of NatropalermoiteHide

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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

Geological Setting of Type Material:

Complex, phosphate-bearing pegmatite.

Associated Minerals at Type Locality:

Reference:

Schumer, Benjamin N., Yang, Hexiong, Downs, Robert 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 (4) 833-840 doi:10.1180/minmag.2016.080.133

Synonyms of NatropalermoiteHide

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Relationship of Natropalermoite to other SpeciesHide

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Other Members of Palermoite Group:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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Notes:

Insoluble in water and acetone.

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for NatropalermoiteHide

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References for NatropalermoiteHide

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Reference List:

Schumer, Benjamin N., Yang, Hexiong, Downs, Robert 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 (4) 833-840 doi:10.1180/minmag.2016.080.133

Localities for NatropalermoiteHide

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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

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.