Gachingite (original) (raw)

A valid IMA mineral species

Specific Gravity:

10.47 (Calculated)

Crystal System:

Orthorhombic

Name:

Named for the Gaching ore occurrence of the Maletoyvayam epithermal deposit, Kamchatka, Russia, the type locality.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:55532:0

aebca4ba-e045-46a1-bc6f-24564232c4fc

IMA Classification of GachingiteHide

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IMA Formula:

Au(Te1-xSex) 0.2 ≈ x ≤ 0.5

Classification of GachingiteHide

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2.CB.

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
C : Metal Sulfides, M: S = 1: 1 (and similar)
B : With Zn, Fe, Cu, Ag, etc.

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.

Symbol Source Reference
Gac 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 GachingiteHide

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Density:

10.47 g/cm3 (Calculated)

Optical Data of GachingiteHide

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Anisotropism:

Strong, blue to dark blue to brown

Bireflectance:

Bluish-grey to deep grey

Reflectivity:

Wavelength R1 R2
470nm 39.9% 40.3%
546nm 41.6% 43.3%
589nm 42.0% 43.7%
650nm 43.0% 44.0%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 44.0%.
R1 shown in black, R2 shown in red

Colour in reflected light:

Grey with a bluish tint

Chemistry of GachingiteHide

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Mindat Formula:

Au(Te1-xSex)

0.2 ≈ x ≤ 0.5

Crystallography of GachingiteHide

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Crystal System:

Orthorhombic

Class (H-M):

m m m _(_2/_m_2/_m_2/m ) - Dipyramidal

Cell Parameters:

a = 7.5379 Å, b = 5.7415 Å, c = 8.8985 Å

Ratio:

a:b:c = 1.313 : 1 : 1.55

Comment:

Space group is Cmce

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

d-spacing Intensity
4.462 Å (41)
3.194 Å (27)
2.884 Å (74)
2.878 Å (69)
2.734 Å (100)
2.231 Å (28)
2.215 Å (43)
1.813 Å (62)

Type Occurrence of GachingiteHide

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General Appearance of Type Material:

Individual droplet-like grains of sizes from 2 to 10 μm included in native gold.

Place of Conservation of Type Material:

mineralogical collections of the Central Siberian Geological Museum (CSGM), V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Science, prosp. Akad. Koptyuga 3, 630090 Novosibirsk, Russia, catalogue number V-10/1

Associated Minerals at Type Locality:

Related Minerals - Strunz-mindat GroupingHide

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2.CB. Agmantinite Ag2MnSnS4 Orth.
2.CB. Richardsite Zn2CuGaS4 Tet. 42_m_ : I_42_m
2.CB. Tolstykhite Au3S4Te6 Tric. 1 : _P_1
2.CB. Hanswilkeite KFeS2 Mon. 2/m : _B_2/b
2.CB. Auroselenide AuSe Mon. 2/m : _B_2/m
2.CB. Ruizhongite (Ag2◻)Pb3Ge2S8 Iso. 43_m_ : I_43_d
2.CB. Okruginite Cu2SnSe3 Mon. m : B b
2.CB.05a Coloradoite HgTe Iso. 43_m_ : F_43_m
2.CB.05a Hawleyite CdS Iso. 43_m_ : F_43_m
2.CB.05a Metacinnabar HgS Iso. 43_m_ : F_43_m
2.CB.05c Polhemusite (Zn,Hg)S Tet.
2.CB.05b Sakuraiite (Cu,Zn,Fe)3(In,Sn)S4 Iso.
2.CB.05a Sphalerite ZnS Iso. 43_m_ : F_43_m
2.CB.05a Stilleite ZnSe Iso. 43_m_ : F_43_m
2.CB.05a Tiemannite HgSe Iso. 43_m_ : F_43_m
2.CB.05 UM1998-15-S:CuFeZn Cu2Fe3Zn5S10
2.CB.05a Rudashevskyite (Fe,Zn)S Iso. 43_m_ : F_43_m
2.CB.05a Ishiharaite (Cu,Ga,Fe,In,Zn)S Iso. 43_m_ : F_43_m
2.CB.07a Shenzhuangite NiFeS2 Tet. 42_m_ : I_42_d
2.CB.07a Unnamed (Cu-Mn-Sn Sulphide) Cu2MnSnS4
2.CB.10a Chalcopyrite CuFeS2 Tet. 42_m_ : I_42_d
2.CB.10a Eskebornite CuFeSe2 Tet. 42_m_ : P_42_c
2.CB.10a Gallite CuGaS2 Tet. 42_m_ : I_42_d
2.CB.10b Haycockite Cu4Fe5S8 Orth. 222
2.CB.10a Lenaite AgFeS2 Tet. 42_m_ : I_42_d
2.CB.10b Mooihoekite Cu9Fe9S16 Tet. 42_m_ : P_42_m
2.CB.10b Putoranite Cu1.1Fe1.2S2 Iso. m_3_m _(_4/_m_32/m ) : P n_3_m
2.CB.10a Roquesite CuInS2 Tet. 42_m_ : I_42_d
2.CB.10b Talnakhite Cu9(Fe,Ni)8S16 Iso. 43_m_ : I_43_m
2.CB.10a Laforêtite AgInS2 Tet. 42_m_ : I_42_d
2.CB.10a Unnamed (Cu-Zn-In Sulphide) CuZn2InS4
2.CB.10a UM1984-30-S:CuFeSn Cu2Fe2Sn3S7
2.CB.10c Omariniite Cu8Fe2ZnGe2S12 Orth. 222 : _I_222
2.CB.15a Černýite Cu2(Cd,Zn,Fe)SnS4 Tet. 42_m_ : I_42_m
2.CB.15a Ferrokësterite Cu2FeSnS4 Tet. 4 : _I_4
2.CB.15a Hocartite Ag2(Fe2+,Zn)SnS4 Tet. 42_m_ : I_42_m
2.CB.15a Idaite Cu5FeS6 Hex.
2.CB.15a Kësterite Cu2ZnSnS4 Tet. 4 : _I_4
2.CB.15a Kuramite Cu3SnS4 Tet. 42_m_ : I_42_m
2.CB.15b Mohite Cu2SnS3 Mon.
2.CB.15a Pirquitasite Ag2ZnSnS4 Tet. 4 : _I_4
2.CB.15a Stannite Cu2FeSnS4 Tet. 42_m_ : I_42_m
2.CB.15c Stannoidite Cu+6Cu2+2(Fe2+,Zn)3Sn2S12 Orth. 222 : _I_222
2.CB.15a Velikite Cu2HgSnS4 Tet. 4 : _I_4
2.CB.15c UM2006-11-S:CuFeGeZn Cu8(Fe,Zn)3Ge2S12 (?)
2.CB.17a v Arsenic-bearing Renierite Cu11GeAsFe4S16
2.CB.20 Chatkalite Cu6FeSn2S8 Tet. 42_m_ : _P_4_m_2
2.CB.20 Mawsonite Cu6Fe2SnS8 Tet. 42_m_ : _P_4_m_2
2.CB.30 Argyropyrite near Ag2Fe7S11
2.CB.30 Colusite Cu13VAs3S16 Iso. 43_m_ : P_43_n
2.CB.30 Germanite Cu13Fe2Ge2S16 Iso. 43_m_ : P_43_n
2.CB.30 Germanocolusite Cu26V2(Ge,As)6S32 Iso. 43_m_ : P_43_m
2.CB.30 Nekrasovite Cu26V2(Sn,As,Sb)6S32 Iso. 43_m_ : P_43_n
2.CB.30 Stibiocolusite Cu13V(Sb,Sn,As)3S16 Iso. 43_m_ : P_43_m
2.CB.30 Ovamboite Cu20(Fe,Cu,Zn)6W2Ge6S32 Iso. 43_m_ : P_43_n
2.CB.30 Maikainite Cu20(Fe,Cu)6Mo2Ge6S32 Iso. m_3_m _(_4/_m_32/m )
2.CB.30 Frieseite Ag2Fe5S8 (?)
2.CB.35a Hemusite Cu6SnMoS8 Iso.
2.CB.35a Kiddcreekite Cu6SnWS8 Iso. 43_m_ : F_43_m
2.CB.35a Polkovicite (Fe,Pb)3(Ge,Fe)1-xS4 Iso.
2.CB.35a Renierite (Cu1+,Zn)11Fe4(Ge4+,As5+)2S16 Tet. 42_m_ : P_42_c
2.CB.35a Vinciennite Cu+7Cu2+3Fe2+2Fe3+2Sn(As,Sb)S16 Tet.
2.CB.35a Morozeviczite (Pb,Fe)3Ge1-xS4 Iso.
2.CB.35b Catamarcaite Cu6GeWS8 Hex. 6_m_ m : P_63_m c
2.CB.40 Lautite CuAsS Orth. m m m _(_2/_m_2/_m_2/m ) : P n m a
2.CB.42 Lingbaoite AgTe3 Trig. 3_m_ : R_3_m
2.CB.45 Cadmoselite CdSe Hex. 6_m_ m : P_63_m c
2.CB.45 Greenockite CdS Hex. 6_m_ m : P_63_m c
2.CB.45 Wurtzite (Zn,Fe)S Hex. 6_m_ m : P_63_m c
2.CB.45 Rambergite MnS Hex. 6_m_ m : P_63_m c
2.CB.45 Buseckite (Fe,Zn,Mn)S Hex. 6_m_ m : P_63_m c
2.CB.45 Maletoyvayamite Au3Se4Te6 Tric. 1 : _P_1
2.CB.47 Murchisite Cr5S6 Trig. 3_m_ _(_32/m ) : P_31_c
2.CB.50 Zincselenide ZnSe
2.CB.50 Wassonite TiS Trig. 3_m_ _(_32/m ) : R_3_m
2.CB.52 Dzhezkazganite ReMoCu2PbS6 ? Trig. 3_m_ : R_3_m
2.CB.55a Cubanite CuFe2S3 Orth. m m m _(_2/_m_2/_m_2/m )
2.CB.55b Isocubanite CuFe2S3 Iso. m_3_m _(_4/_m_32/m ) : F m_3_m
2.CB.60 Picotpaulite TlFe2S3 Orth. m m m _(_2/_m_2/_m_2/m ) : C m c m
2.CB.60 Raguinite TlFeS2 Orth.
2.CB.65 Argentopyrite AgFe2S3 Mon. 2/m
2.CB.65 Sternbergite AgFe2S3 Orth. m m m _(_2/_m_2/_m_2/m )
2.CB.70 Sulvanite Cu3VS4 Iso. 43_m_ : P_43_m
2.CB.75 Vulcanite CuTe Orth. m m m _(_2/_m_2/_m_2/m )
2.CB.80 Empressite AgTe Orth. m m m _(_2/_m_2/_m_2/m )
2.CB.85 Muthmannite AuAgTe2 Mon. 2/m : _P_2/m

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.

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References for GachingiteHide

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Reference List:

Tolstykh, Nadhezda D., Tuhý, Marek, Vymazalová, Anna, Laufek, František, Plášil, Jakub, Košek, Filip (2022) Gachingite, Au(Te1–x_Se_x) 0.2 ≈ x ≤ 0.5, a new mineral from Maletoyvayam deposit, Kamchatka peninsula, Russia. Mineralogical Magazine, 86 (2) 205-213 doi:10.1180/mgm.2022.9

Localities for GachingiteHide

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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.

Russia (TL)
Kamchatka Krai Koryak Okrug Karaginsky District Maletoyvayam ore field ⓘ Gaching occurrence (TL) Miyawaki et al. (2021) +2 other references