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Gladkovskyite

A valid IMA mineral species
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Formula:
MnTlAs3S6
Colour:
Dark cherry-red
Lustre:
Adamantine
Hardness:
2 - 2½
Specific Gravity:
4.356 (Calculated)
Crystal System:
Trigonal
Name:
Named in honor of Boris Aleksandrovitch Gladkovsky (Борис Александрович Гладковский) (1937–1990), a well-known geologist and prospector of ore and alluvial gold in the Ural Mountains. He was chief geologist of the Geological Survey of Northern Urals and helped discover the Vorontsovskoe deposit, the biggest in Northern Urals and one of the most significant gold deposits in Russia. The name is pronounced: glad kouv ski yait.
New structure type. Chemically related to auerbakhite.


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Unique IdentifiersHide

Mindat ID:
53221
Long-form identifier:
mindat:1:1:53221:3

IMA Classification of GladkovskyiteHide

Classification of GladkovskyiteHide

Strunz-mindat (2026):
2.LA.

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
L : Unclassified Sulfosalts
A : Without essential Pb

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference for Standard
GkvIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of GladkovskyiteHide

Lustre:
Adamantine
Transparency:
Transparent
Colour:
Dark cherry-red
Streak:
Red
Hardness:
2 - 2½ on Mohs scale
Hardness:
VHN100=91 - 100 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
None observed
Fracture:
Irregular/Uneven
Density:
4.356 g/cm3 (Calculated)
Comment:
Calculated from empirical formula

Optical Data of GladkovskyiteHide

Anisotropism:
Strong, light-grey to brown
Bireflectance:
Very weak
Reflectivity:
WavelengthR1 (%)R2 (%)
400nm28.42% 21.43%
420nm27.59% 22.54%
400nm27.19% 22.94%
460nm26.04% 23.26%
480nm24.91% 23.77%
500nm24.32% 23.97%
520nm23.86% 23.76%
540nm23.73% 23.50%
546nm23.50% 23.42%
560nm22.78% 22.65%
580nm22.48% 22.35%
589nm22.38% 22.25%
600nm22.28% 22.17%
620nm21.87% 21.64%
640nm21.72% 21.22%
660nm21.71% 20.85%
680nm21.67% 20.48%
700nm21.63% 20.20%


Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 28.42%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Grayish-white
Pleochroism:
Visible
Comments:
Orange-red to dark-red

Chemistry of GladkovskyiteHide

Mindat Formula:
MnTlAs3S6
Element Weights:
Element% weight
As33.226 %
Tl30.213 %
S28.440 %
Mn8.121 %

Calculated from ideal end-member formula.
Elements listed:
As, Mn, S, Tl - search for minerals with similar chemistry

Crystallography of GladkovskyiteHide

Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
R3c
Setting:
R3c
Cell Parameters:
a = 9.6392(2) Å, c = 6.456(1) Å
Ratio:
a:c = 1 : 0.67
Unit Cell V:
519.49 ų
Z:
2

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Near-surface Processes
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47)
High-? alteration and/or metamorphism
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12])

Type Occurrence of GladkovskyiteHide

Synonyms of GladkovskyiteHide

Other Language Names for GladkovskyiteHide

Related Minerals - Strunz-mindat GroupingHide

2.LA.ThunderbayiteTlAg3Au3Sb7S6Tric. 1 : P1
2.LA.AuerbakhiteMnTl2As2S5Orth.
2.LA.BiagioniiteTl2SbS2Mon. m : Pb
2.LA.Ferrofettelite[Ag6As2S7][Ag10FeAs2S8]Mon. 2 : B2
2.LA.10DervilliteAg2AsS2Mon. m : Pb
2.LA.15DaomaniteCuPtAsS2Orth.
2.LA.20VaughaniteTlHgSb4S7Tric.
2.LA.25CriddleiteTlAg2Au3Sb10S10Mon.
2.LA.30Fettelite[Ag6As2S7][Ag10HgAs2S8] Mon. 2 : B2
2.LA.35Chaméanite(Cu,Fe)4As(Se,S)4Iso.
2.LA.40ArcubisiteAg6CuBiS4
2.LA.45MgriiteCu3AsSe3Iso. m3m(4/m32/m)
2.LA.50Benleonardite[Ag6(Sb,As)2S6Te][Ag9Cu(S,Te)2Te2]Trig. 3m(32/m) : P3m1
2.LA.55TsnigriiteAg9SbTe3S3Mon.
2.LA.60BorovskitePd3SbTe4Iso.
2.LA.65JonassoniteAuBi5S4Mon.
2.LA.65NuwaiteNi6GeS2Tet. 4/mmm(4/m2/m2/m) : I4/mmm
2.LA.65ButianiteNi6SnS2Tet. 4/mmm(4/m2/m2/m) : I4/mmm
2.LA.70RaberiteTl5Ag4As6SbS15 Tric. 1 : P1
2.LA.75SpaltiiteTl2Cu2As2S5Mon. 2/m : P21/b

Other InformationHide

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 GladkovskyiteHide

References for GladkovskyiteHide

Localities for GladkovskyiteHide

Showing 1 localities.

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.
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Locality ListHide

- 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)
 
  • Sverdlovsk Oblast
    • Serovsky District
      • Turya river
        • Tur'insk
Kasatkin et al. (2019) +2 other references
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