Shiranuiite (original) (raw)

A valid IMA mineral species

Specific Gravity:

5.78 (Calculated)

Name:

This new mineral was named shiranuiite based on a Japanese legend that leads to the ancient name for Kumamoto Prefecture, Kyushu, Japan. In the Nihon Shoki (Chronicles of Japan), the oldest book that records the history of Japan, Emperor Keiko, the 12th emperor of Japan, lost his bearing at sea during a pilgrimage to Kyushu, but was able to land safely because he fortunately saw fire in the distance. He then asked, "Who lit the fire?" to which everyone reportedly replied that it was "The fire that everyone does not know about (= SHIRANUI, in Japanese historical kana orthography)". From this lore, this area came to be called "Land of Fire", now known as Kumamoto Prefecture. Shiranuiite was named in honor of this interesting episode of the locality.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:471057:4

c7c90ef7-c24f-4095-966b-d7b9e6874bf1

IMA Classification of ShiranuiiteHide

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Approved, Pending publication

Classification of ShiranuiiteHide

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2.DA.05

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
D : Metal Sulfides, M: S = 3 :4 and 2:3
A : M:S = 3:4

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 ShiranuiiteHide

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Comment:

according to the analogous thiospinel-group minerals

Cleavage:

Poor/Indistinct
estimated to be along the {111} planes according to the isotypic malanite

Density:

5.78 g/cm3 (Calculated)

Chemistry of ShiranuiiteHide

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Mindat Formula:

Cu+(Rh3+Rh4+)S4

Crystallography of ShiranuiiteHide

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Class (H-M):

m_3_m _(_4/_m_32/m ) - Hexoctahedral

Cell Parameters:

a = 9.757(2) Å

Unit Cell V:

928.86 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Type Occurrence of ShiranuiiteHide

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General Appearance of Type Material:

Isoferroplatinum-based grains are often accompanied by black to gray colored nubs from 20 to 500 μm in size. Shiranuiite and cuprorhodsite occur as dominant minerals of such nubs, although both are indistinguishable based on the occurrence mode and can only be distinguished by chemical analysis.

Place of Conservation of Type Material:

Type material is deposited in the collections of the National Museum of Nature and Science, Amakubo, Tsukuba, Ibaraki 305-0005, Japan, specimen number NSM-M50086

Geological Setting of Type Material:

The clinopyroxenite mass has a depression near the center, and a small river, approximately 2-3 m wide and 2 km long, passes through this area and joins the Shakain River. PGM can be collected as a placer in this small river. Most of the PGM placer collected was composed of isoferroplatinum-based grains that are irregularly shaped with an average size of less than 1 mm, although grains up to 4 mm were also obtained.

Associated Minerals at Type Locality:

Relationship of Shiranuiite to other SpeciesHide

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Other Members of this group:

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 ShiranuiiteHide

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References for ShiranuiiteHide

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Reference List:

Nishio-Hamane, D., Tanaka, T., and Shinmachi, T.: Shiranuiite, IMA 2023-072a, in: CNMNC Newsletter 78, Eur. J. Mineral., 36, https://doi.org/10.5194/ejm-36-361-2024, 2024.

Localities for ShiranuiiteHide

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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.