Alluaudite-Na□ (original) (raw)

A material that is NOT an approved mineral species

Formula:

◻4Na4Mn2+4Fe3+8(PO4)12

Colour:

Greenish black, brownish black

Lustre:

Sub-Vitreous, Resinous, Greasy

Specific Gravity:

3.52 - 3.58

Crystal System:

Monoclinic

Name:

A name proposed in 1971 by Moore and later by Moore & Ito (1979) for a member of the Alluaudite Group.

This page provides mineralogical data about Alluaudite-Na□.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:31862:2

47ee5756-9f96-42b1-943d-13d735a3b5eb

Classification of Alluaudite-Na□Hide

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8.AC.05 va

8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
C : With medium-sized and large cations

Physical Properties of Alluaudite-Na□Hide

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Sub-Vitreous, Resinous, Greasy

Colour:

Greenish black, brownish black

Cleavage:

Distinct/Good
{010, {-101} good

Fracture:

Irregular/Uneven

Density:

3.52 - 3.58 g/cm3 (Measured) 3.6 g/cm3 (Calculated)

Optical Data of Alluaudite-Na□Hide

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RI values:

_n_α = 1.764 - 1.782 _n_β = 1.779 - 1.802

δ = 1.764

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

Comments:

X = pale olive to greenish yellow Z light yellow to medium olive green

Comments:

RI increases rapidly with increasing ferric iron.

Chemistry of Alluaudite-Na□Hide

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Mindat Formula:

◻4Na4Mn2+4Fe3+8(PO4)12

Crystallography of Alluaudite-Na□Hide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 12.004 Å, b = 12.533 Å, c = 6.404 Å
β = 114.4°

Ratio:

a:b:c = 0.958 : 1 : 0.511

Unit Cell V:

877.40 ų (Calculated from Unit Cell)

Comment:

Am Min 56:1955-1975 structure

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

ICDD 42-581; see also 14-245

Relationship of Alluaudite-Na□ to other SpeciesHide

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Other Members of this group:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of Alluaudite-Na□Hide

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Other InformationHide

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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 Alluaudite-Na□Hide

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References for Alluaudite-Na□Hide

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Localities for Alluaudite-Na□Hide

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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.