Tsugaruite (original) (raw)

A valid IMA mineral species

About TsugaruiteHide

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Formerly assumed to be Pb4As2S7.

Specific Gravity:

6.83 (Calculated)

Crystal System:

Orthorhombic

Name:

Named after the discovery locality, Yunosawa Mine, Tsugaru-gun, Aomori Prefecture, Japan.

An "N = 4 plesiotypic derivative of the homologous series of Pb-Sb chloro-sulfosalts" with "the general formula Pb(2+2N)(Sb,Pb)(2+2N)S(2+2N)(S,Cl)(4+2N)ClN".

Cl/(Cl+S) is similar to that in pillaite and pellouxite; and slightly higher than that shown by dadsonite.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:7344:4

636100f9-5e3a-42ae-bf27-b46ca31b8f45

IMA Classification of TsugaruiteHide

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IMA status notes:

Redefined by the IMA

Approval history:

2019: Redefined as a lead-arsenic chloro-sulfosalt, Pb28As15S50Cl (Proposal 19-A)

Type description reference:

Shimizu, M., Miyawaki, R., Kato, A., Matsubara, S., Matsuyama, F. and Kiyota, K. (1998) Tsugaruite, Pb4As2S7, a new mineral species from the Yunosawa mine, Aomori Prefecture, Japan. Mineralogical Magazine: 62(6): 793-799.

Classification of TsugaruiteHide

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2.JB.30c

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
J : Sulfosalts of PbS archetype
B : Galena derivatives, with Pb

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 TsugaruiteHide

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Hardness:

VHN25=75.4 - 94.9 kg/mm2 - Vickers

Fracture:

Irregular/Uneven

Density:

6.83 g/cm3 (Calculated)

Optical Data of TsugaruiteHide

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Anisotropism:

Weak/moderate; rotation tints of dark brownish gray at near-extinction, to dark yellowish gray, and to dark greenish gray

Reflectivity:

Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 34.0%.
R1 shown in black, R2 shown in red, imR1 shown in green, imR2 shown in blue

Internal Reflections:

None

Comments:

White with a greenish tint to gray-white with a greenish tint.

Chemistry of TsugaruiteHide

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Mindat Formula:

Pb28As15S50Cl

Formerly assumed to be Pb4As2S7.

Crystallography of TsugaruiteHide

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Crystal System:

Orthorhombic

Class (H-M):

m _m_2 - Pyramidal

Cell Parameters:

a = 8.0774(10) Å, b = 15.1772(16) Å, c = 38.129(4) Å

Ratio:

a:b:c = 0.532 : 1 : 2.512

Morphology:

Elongate [001] and tabular on {010}.

Comment:

Space group Pnn2 or Pnnm according to Shimizu et al. (1998). Sub-cell with halved c. However, Biagioni et al. (2020) solved the structure in the space group Pnn2 (unit cell parameters from this later study)

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of TsugaruiteHide

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General Appearance of Type Material:

Silvery lead-gray, radiating groups of elongate tabular crystals to 2 mm long and 0.04 mm wide.

Place of Conservation of Type Material:

University Museum of the University of Tokyo, Japan.
National Science Museum, Tokyo, Japan.

Geological Setting of Type Material:

Associated Minerals at Type Locality:

Reference:

Shimizu, M., Miyawaki, R., Kato, A., Matsubara, S., Matsuyama, F. and Kiyota, K. (1998) Tsugaruite, Pb4As2S7, a new mineral species from the Yunosawa mine, Aomori Prefecture, Japan. Mineralogical Magazine: 62(6): 793-799.

Synonyms of TsugaruiteHide

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Other Language Names for TsugaruiteHide

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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 TsugaruiteHide

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References for TsugaruiteHide

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Reference List:

Shimizu, M., Miyawaki, R., Kato, A., Matsubara, S., Matsuyama, F. and Kiyota, K. (1998) Tsugaruite, Pb4As2S7, a new mineral species from the Yunosawa mine, Aomori Prefecture, Japan. Mineralogical Magazine: 62(6): 793-799.

Matsushita, Y., Momma, K., Miyawaki, R., Sato, A., Kaise, M, Kitazawa, H. (2014): Crystallographic examination of tsugaruite. IMA2014_ABSTRACT VOLUME.pdf, p. 331.

Biagioni, C., Bindi, L., Momma, K., Miyawaki, R., Matsushita, Y., Moëlo, Y. (2021): Determination of the crystal structure and redefinition of tsugaruite, Pb28As15S50Cl, the first lead-arsenic chloro-sulfosalt. The Canadian Mineralogist: 59(1): 125–137.

Localities for TsugaruiteHide

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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.