Ferroalluaudite (original) (raw)

A valid IMA mineral species - grandfathered

About FerroalluauditeHide

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Formula:

(Na,Ca)Fe2+(Fe3+,Mn2+,Fe2+)2(PO4)3

Colour:

Straw-yellow to brownish yellow, green, greenish black; yellow to yellow-green in transmitted light.

Specific Gravity:

3.4 - 3.5

Crystal System:

Monoclinic

Name:

In allusion to the composition, containing dominant iron (Latin = FERRum) and Alluaudite in allusion to its relationship to that species.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:1507:9

c70aacab-2de0-4f02-9d69-1b83d2e0ea54

IMA Classification of FerroalluauditeHide

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Approved, 'Grandfathered' (first described prior to 1959)

IMA Formula:

NaFe2+Fe3+2(PO4)3

Classification of FerroalluauditeHide

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8.AC.10

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

38.2.3.5

38 : ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
2 : (AB)5(XO4)3

19.12.29

19 : Phosphates
12 : Phosphates of Mn

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.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

Physical Properties of FerroalluauditeHide

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Colour:

Straw-yellow to brownish yellow, green, greenish black; yellow to yellow-green in transmitted light.

Cleavage:

Distinct/Good
On {100} and {010}, good.

Density:

3.4 - 3.5 g/cm3 (Measured) 3.67 g/cm3 (Calculated)

Optical Data of FerroalluauditeHide

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RI values:

_n_α = 1.727 _n_γ = 1.738

δ = 0.011

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

Dispersion:

relatively strong

Comments:

X = dull green to pale blue; Y = Z = bright green with a bluish tinge.

Chemistry of FerroalluauditeHide

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Mindat Formula:

(Na,Ca)Fe2+(Fe3+,Mn2+,Fe2+)2(PO4)3

Crystallography of FerroalluauditeHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 11.898(2) Å, b = 12.541(2) Å, c = 6.434(1) Å
β = 114.1°

Ratio:

a:b:c = 0.949 : 1 : 0.513

Unit Cell V:

876.35 ų (Calculated from Unit Cell)

Morphology:

Massive; compact granular; radiating fibrous or globular aggregates.

Comment:

space group by analogy to alluaudite

Crystal StructureHide

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Geological EnvironmentHide

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Type Occurrence of FerroalluauditeHide

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Place of Conservation of Type Material:

National Museum of Natural History, Washington, D.C., USA, 162558.

Synonyms of FerroalluauditeHide

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Other Language Names for FerroalluauditeHide

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Relationship of Ferroalluaudite to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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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 FerroalluauditeHide

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References for FerroalluauditeHide

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Reference List:

**Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York.**pp.674-675 - as Alluaudite

Localities for FerroalluauditeHide

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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.