Rumoiite
A valid IMA mineral species
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About Rumoiite
Formula:
AuSn2
Colour:
Silver white
Lustre:
Metallic
Hardness:
2½
Specific Gravity:
10.1 (Calculated)
Crystal System:
Orthorhombic
Name:
Named after Rumoi Subprefecture, Japan, that includes the type locality.
Unique Identifiers
Mindat ID:
53563
Long-form identifier:
mindat:1:1:53563:6
Similar Names
| Romeita | A synonym of Roméite Group | |
| Roméite | A solid-solution series between two end-member minerals | |
| Roumaite | A valid IMA mineral species | (Ca,Na,REE,◻)7(Nb,Ti)[Si2O7]2OF3 |
IMA Classification of Rumoiite
Approved
Approval year:
2019
First published:
2021
Type description reference:
NISHIO–HAMANE, Daisuke, SAITO, Katsuyuki (2021) Au(Ag)–Sn–Sb–Pb minerals in association with placer gold from Rumoi province of Hokkaido, Japan: a description of two new minerals (rumoiite and shosanbetsuite). Journal of Mineralogical and Petrological Sciences, 116 (5). 263-271 doi:10.2465/jmps.210829
Classification of Rumoiite
1.AC.20
1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
A : Metals and Intermetallic Alloys
C : Indium-tin family
1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
A : Metals and Intermetallic Alloys
C : Indium-tin family
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Rmo | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Rumoiite
Metallic
Transparency:
Opaque
Colour:
Silver white
Streak:
Gray
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Density:
10.1 g/cm3 (Calculated)
Optical Data of Rumoiite
Anisotropism:
Strong to moderate, blue to brownish yellow.
Reflectivity:
| Wavelength | R1 (%) |
|---|---|
| 400nm | 70.4% |
| 420nm | 71.6% |
| 440nm | 72.7% |
| 460nm | 74.1% |
| 470nm | 75.6% |
| 480nm | 76.4% |
| 500nm | 77.1% |
| 520nm | 77.5% |
| 540nm | 77.9% |
| 546nm | 78.1% |
| 560nm | 78.2% |
| 580nm | 78.6% |
| 589nm | 78.7% |
| 600nm | 78.7% |
| 620nm | 78.9% |
| 640nm | 78.8% |
| 650nm | 78.7% |
| 660nm | 78.9% |
| 680nm | 78.0% |
| 700nm | 80.9% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 80.9%.
Colour in reflected light:
White
Pleochroism:
Weak
Comments:
White to slightly bluish white.
Chemistry of Rumoiite
Mindat Formula:
AuSn2
Element Weights:
| Element | % weight |
|---|---|
| Sn | 54.656 % |
Calculated from ideal end-member formula.
Elements listed:
Crystallography of Rumoiite
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Space Group:
Pbca
Setting:
Pbca
Cell Parameters:
a = 6.905(2) Å, b = 7.017(2) Å, c = 11.797(3) Å
Ratio:
a:b:c = 0.984 : 1 : 1.681
Unit Cell V:
571.59 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.542 Å | (58) |
| 3.774 Å | (48) |
| 2.950 Å | (100) |
| 2.711 Å | (52) |
| 2.409 Å | (41) |
| 2.244 Å | (56) |
| 2.136 Å | (47) |
| 2.123 Å | (65) |
Locality:
Reference:
NISHIO–HAMANE, Daisuke, SAITO, Katsuyuki (2021) Au(Ag)–Sn–Sb–Pb minerals in association with placer gold from Rumoi province of Hokkaido, Japan: a description of two new minerals (rumoiite and shosanbetsuite). Journal of Mineralogical and Petrological Sciences, 116 (5). 263-271 doi:10.2465/jmps.210829
Comments:
From Type Description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Rumoiite
General Appearance of Type Material:
Forming a network around grains of yuanjiangite. The thickness is ~4 μm maximum.
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the National Museum of Nature and Science, Tsukuba, Japan, specimen number NSM-M46178 (holotype) and M46179 (cotype).
Geological Setting of Type Material:
Placer gold and platinum–group minerals.
Associated Minerals at Type Locality:
Reference:
NISHIO–HAMANE, Daisuke, SAITO, Katsuyuki (2021) Au(Ag)–Sn–Sb–Pb minerals in association with placer gold from Rumoi province of Hokkaido, Japan: a description of two new minerals (rumoiite and shosanbetsuite). Journal of Mineralogical and Petrological Sciences, 116 (5). 263-271 doi:10.2465/jmps.210829
Synonyms of Rumoiite
Other Language Names for Rumoiite
Common Associates
Associations Based on Photo Data:
| 3 photos of Rumoiite associated with Native Lead | Pb |
| 3 photos of Rumoiite associated with Native Gold | Au |
| 3 photos of Rumoiite associated with Yuanjiangite | AuSn |
| 1 photo of Rumoiite associated with Anyuiite | AuPb2 |
| 1 photo of Rumoiite associated with Novodneprite | AuPb3 |
Related Minerals - Strunz-mindat Grouping
| 1.AC.05 | Native Indium | In |
| 1.AC.10 | Native Tin | Sn |
| 1.AC.15 | 'Eta-bronze' | Cu6Sn5 |
| 1.AC.15 | 'UM1965-07-E:CuSn' | Cu3Sn |
| 1.AC.15 | Sorosite | Cu1+x(Sn,Sb) |
| 1.AC.15 | Yuanjiangite | AuSn |
Other Information
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 Rumoiite
mindat.org URL:
https://www.mindat.org/min-53563.html
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External Links:
Mineral Dealers:
References for Rumoiite
Reference List:
Miyawaki, Ritsuro, Hatert, Frédéric, Mills, Stuart J. (2019) New minerals and nomenclature modifications approved in 2019. CNMNC Newsletter 49. Mineralogical Magazine, 83 (3) 479-483 doi:10.1180/mgm.2019.35
NISHIO–HAMANE, Daisuke, SAITO, Katsuyuki (2021) Au(Ag)–Sn–Sb–Pb minerals in association with placer gold from Rumoi province of Hokkaido, Japan: a description of two new minerals (rumoiite and shosanbetsuite). Journal of Mineralogical and Petrological Sciences, 116 (5). 263-271 doi:10.2465/jmps.210829
Localities for Rumoiite
Showing 3 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Japan (TL) | |
| Miyawaki et al. (2019) +2 other references |
Russia | |
| Ханчук А.И. et al. (Приморье) |
Switzerland | |
| Meisser et al. (2000) |
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Ariadnoe (Ariadnenskoe) Ti deposit, Dalnerechensk area, Dalnerechensky District, Primorsky Krai, Russia