Johnsomervilleite (original) (raw)

A valid IMA mineral species

About JohnsomervilleiteHide

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Originally given, i.a., as
{Ca}{Na6◻2}{Ca6Na2}{(Fe2+,Mg,Mn2+)43}(PO4)36; the above IMA formula is wrong

Colour:

Dark brown to blackish gray, pitch-black

Lustre:

Sub-Vitreous, Resinous

Name:

Named in 1980 by A. Livingstone in memory of Mr John M. Somerville (1908-1978) who presented to the Royal Scottish Museum a specimen of garnet-quartz rock, which contained the new species.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:2107:0

020abbff-329c-4ddf-8b6e-f4cd89a87b91

IMA Classification of JohnsomervilleiteHide

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IMA status notes:

Redefined by the IMA

IMA Formula:

Na3CaFe2+11(PO4)9

Type description reference:

Classification of JohnsomervilleiteHide

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8.AC.50

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

38.2.5.2

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

19.12.31

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 JohnsomervilleiteHide

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Colour:

Dark brown to blackish gray, pitch-black

Streak:

Light brown; gray-brown with an olive tint

Cleavage:

Perfect
Probably {0001}

Fracture:

Splintery, Sub-Conchoidal

Density:

3.35 g/cm3 (Measured) 3.41 g/cm3 (Calculated)

Optical Data of JohnsomervilleiteHide

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RI values:

_n_α = 1.655 _n_β = 1.655

δ = 1.655

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

Comments:

Anomalously biaxial: α = 1.655 β = ∼1.655 γ = n.d. 2V(meas.) = 10◦
n = 1.646(1) (metamict)

Chemistry of JohnsomervilleiteHide

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Mindat Formula:

Na3CaFe11(PO4)9

Originally given, i.a., as
{Ca}{Na6◻2}{Ca6Na2}{(Fe2+,Mg,Mn2+)43}(PO4)36; the above IMA formula is wrong

Crystallography of JohnsomervilleiteHide

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Class (H-M):

3 - Rhombohedral

Cell Parameters:

a = 15.00 Å, c = 42.75 Å

Unit Cell V:

8,330.08 ų (Calculated from Unit Cell)

Morphology:

Anhedral grains

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

Loch Quoich, Scotland, UK. The data are from the type description.

Geological EnvironmentHide

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Geological Setting:

Granite pegmatite

Type Occurrence of JohnsomervilleiteHide

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General Appearance of Type Material:

Gray to pink greasy grains up to 4 mm in size.

Place of Conservation of Type Material:

Scottish Mineral Collection of the Royal Scottish Museum, Edinburgh.

Geological Setting of Type Material:

Granite pegmatite pods in kyanite-sillimanite gneiss.

Associated Minerals at Type Locality:

Reference:

Livingstone, A. (1980) Johnsomervilleite, a new transition-metal phosphate mineral from the Loch Quoich area, Scotland. Mineralogical Magazine: 43: 833-836.

Synonyms of JohnsomervilleiteHide

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Other Language Names for JohnsomervilleiteHide

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Relationship of Johnsomervilleite 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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Fluorescence of JohnsomervilleiteHide

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Not fluorescent with LW or SW UV.

Other InformationHide

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Notes:

Soluble in 20% HCl, H2SO4, and HNO3.

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 JohnsomervilleiteHide

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References for JohnsomervilleiteHide

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Reference List:

Hatert, Frédéric, Grew, Edward S., Vignola, Pietro, Rotiroti, Nicola, Nestola, Fabrizio, Keller, Paul, Baijot, Maxime, Bruni, Yannick, Fransolet, André-Mathieu, Dal Bo, Fabrice, Depret, Martin (2021) Crystal chemistry and nomenclature of fillowite-type phosphates. The Canadian Mineralogist, 59 (4) 781-796 doi:10.3749/canmin.2000043

Localities for JohnsomervilleiteHide

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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.