Nagyágite (original) (raw)

A valid IMA mineral species - grandfathered

About NagyágiteHide

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Formula:

[Pb3(Pb,Sb)3S6](Au,Te)3

Specific Gravity:

7.35 - 7.49

Crystal System:

Monoclinic

Name:

After the Hungarian name (Nagyág) of the type locality (Săcărâmb, Romania).

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:2830:7

0a74828a-47bd-4a2c-a296-d3a5b7729b23

IMA Classification of NagyágiteHide

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Approved, 'Grandfathered' (first described prior to 1959)

Classification of NagyágiteHide

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2.HB.20a

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
H : Sulfosalts of SnS archetype
B : With Cu, Ag, Fe, Sn and Pb

2.11.10.1

2 : SULFIDES
11 : AmBnXp, with (m+n):p = 2:3

5.3.1

5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
3 : Sulpharsenites etc. of Au

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 NagyágiteHide

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Streak:

Blackish lead-grey

Hardness:

VHN100=60 - 94 kg/mm2 - Vickers

Cleavage:

Perfect
Perfect on {010}, excellent on {101}.

Density:

7.35 - 7.49 g/cm3 (Measured) 7.29 g/cm3 (Calculated)

Optical Data of NagyágiteHide

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Anisotropism:

Weak but distinct

Reflectivity:

Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 48.4%.
R1 shown in black, R2 shown in red

Colour in reflected light:

Pale grey

Chemistry of NagyágiteHide

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Mindat Formula:

[Pb3(Pb,Sb)3S6](Au,Te)3

Common Impurities:

Ag,Fe,Bi

Crystallography of NagyágiteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 4.220(1) Å, b = 4.176(1) Å, c = 15.119(3) Å
β = 95.42(3)°

Ratio:

a:b:c = 1.011 : 1 : 3.62

Unit Cell V:

265.25 ų (Calculated from Unit Cell)

Morphology:

Thin {010} tabular crystals, commonly bent. Also granular.

Twinning:

Multiple twinning on (001).

Comment:

Pseudo-tetragonal/orthorhombic

Crystallographic forms of NagyágiteHide

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Crystal Atlas:

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

Săcărâmb (Nagyág), Romania (ICDD 00-047-1755).

Geological EnvironmentHide

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Geological Setting:

In Au–Te-bearing epithermal hydrothermal veins.

Type Occurrence of NagyágiteHide

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Associated Minerals at Type Locality:

Synonyms of NagyágiteHide

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Other Language Names for NagyágiteHide

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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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Fluorescence of NagyágiteHide

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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 NagyágiteHide

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References for NagyágiteHide

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Reference List:

Johan, Z., Dódony, I., Moravek, P., Pasava, J. (1994) Buckhornite, Pb2AuBiTe2S3,from the Jilove gold deposit, Czech Republic. C. Rendu Acad. Sci. Paris, Ser. II, 318, 1225-1231 (in French, extended English abs.).

Effenberger, Herta, Paar, Werner H., Topa, Dan, Culetto, Franz J., Giester, Gerald (1999) Toward the crystal structure of nagyagite, [Pb(Pb,Sb)S2][(Au,Te)]. American Mineralogist, 84 (4) 669-676 doi:10.2138/am-1999-0420

Sung, Y.H., Ciobanu, C.L., Pring, A., Brügger, J., Skinner, W., Cook, N.J., Nugus, M. (2007). Tellurides from Sunrise Dam gold deposit, Yilgarn Craton, Western Australia: a new occurrence of nagyágite. Mineralogy and Petrology, 91(3), 249-270.

Ciobanu, C.L., Cook, N.J., Pring, A., Damian, G., Căpraru, N. (2008). Another look at nagyágite from the type locality, S c rîmb, Romania: replacement, chemical variation and petrogenetic implications. Mineralogy and Petrology, 93(3-4), 273-307.

Localities for NagyágiteHide

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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.