Ferromerrillite (original) (raw)

A valid IMA mineral species

Specific Gravity:

3.11 (Calculated)

Name:

Named for being the Fe2+ (ferro) dominant analogue of merrillite. The root name is for George P. Merrill (1854-1929), Curator of Geology, U.S. National Museum (Smithsonian Institution).

Fe2+-dominant analogue of Merrillite.

Chemically similar to 'ferrohagendorfite' and kapundaite (the latter contains water); somewhat similar to wicksite.

Grains are strongly deformed (7-degree angular mosaicity) due to impact shock, but that was not high enough (not over 23 GPa) for the transformation to tuite.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:31308:9

cd839734-cfe5-4eb7-850e-07515530ad0c

IMA Classification of FerromerrilliteHide

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Type description reference:

Classification of FerromerrilliteHide

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8.AC.45

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

38.3.4.7

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

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 FerromerrilliteHide

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Density:

3.11 g/cm3 (Calculated)

Optical Data of FerromerrilliteHide

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RI values:

_n_ω = 1.623 - 1.624 _n_ε = 1.621

δ = 0.002 - 0.003

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

Dispersion:

may be anomalously biaxial

Pleochroism:

Non-pleochroic

Chemistry of FerromerrilliteHide

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Mindat Formula:

Ca9NaFe2+(PO4)7

Crystallography of FerromerrilliteHide

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Class (H-M):

3_m_ - Ditrigonal Pyramidal

Cell Parameters:

a = 10.372 Å, c = 37.217 Å

Unit Cell V:

3,467.34 ų (Calculated from Unit Cell)

Comment:

data for the Shergotty occurrence

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

Shergotty meteorite. Data from the type description.

Geological EnvironmentHide

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Type Occurrence of FerromerrilliteHide

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General Appearance of Type Material:

Anhedral grains to 20–50 µm.

Place of Conservation of Type Material:

A.E. Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia (3514/1).

Geological Setting of Type Material:

Martian meteorites (basaltic and olivine-phyric shergottites).

Reference:

Britvin, S.N., Krivovichev, S.V., Armbruster, T. (2016): Ferromerrillite, Ca9NaFe2+(PO4)7, a new mineral from the Martian meteorites, and some insights into merrillite-tuite transformation in shergottites. European Journal of Mineralogy: 28: 125-13.

Synonyms of FerromerrilliteHide

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Relationship of Ferromerrillite to other SpeciesHide

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Other Members of this group:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of FerromerrilliteHide

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Not fluorescent under LW or SW.

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 FerromerrilliteHide

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References for FerromerrilliteHide

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Localities for FerromerrilliteHide

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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.