Kurilite
A valid IMA mineral species
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About Kurilite
Kuril Islands
Formula:
Ag8Te3Se
Colour:
Light grey to steel grey
Lustre:
Metallic
Hardness:
3
Specific Gravity:
7.799 (Calculated)
Crystal System:
Trigonal
Name:
Named after the Kuril Islands, that include the type locality.
It was published in 1989, abstracted in Am. Min. in 1992, is in the ICDD PDF database as 00-45-1399. "It was not submitted to the New Minerals Commission of the IMA at that time, although it was formally discredited (Burke 2006), as being possibly synonymous with hessite or petzite. Additional mineralogical studies were undertaken, therefore to clarify the chemical composition and crystal structure. In light of these new data, the mineral and its name were approved by the IMA Commission..., IMA No. 2009-080."
Compare IMA2009-080.
Originally described from Kuril Islands, Maritime Province, Sakhalinskaya Oblast', Far-Eastern Region, Russia.
Compare IMA2009-080.
Originally described from Kuril Islands, Maritime Province, Sakhalinskaya Oblast', Far-Eastern Region, Russia.
Unique Identifiers
Mindat ID:
2294
Long-form identifier:
mindat:1:1:2294:7
GUID
(UUID V4):
(UUID V4):
923301a4-a4ad-424a-8206-081d9617b6a2
IMA Classification of Kurilite
Classification of Kurilite
2.BA.45
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
B : Metal Sulfides, M: S > 1: 1 (mainly 2: 1)
A : With Cu, Ag, Au
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
B : Metal Sulfides, M: S > 1: 1 (mainly 2: 1)
A : With Cu, Ag, Au
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 |
|---|---|---|
| Kri | 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 Kurilite
Metallic
Transparency:
Opaque
Colour:
Light grey to steel grey
Streak:
Black
Hardness:
3 on Mohs scale
Hardness:
VHN25=99.9 kg/mm2 - Vickers
Cleavage:
None Observed
Parting:
none
Density:
7.799 g/cm3 (Calculated)
Optical Data of Kurilite
Reflectivity:
| Wavelength | R1 | R2 |
|---|---|---|
| 400nm | 42.3% | 26.6% |
| 420nm | 42.6% | 26.9% |
| 440nm | 43.0% | 27.0% |
| 460nm | 43.0% | 27.0% |
| 470nm | 43.0% | 27.0% |
| 480nm | 43.0% | 26.9% |
| 500nm | 42.8% | 26.6% |
| 520nm | 42.6% | 26.4% |
| 540nm | 42.4% | 26.0% |
| 546nm | 42.3% | 25.9% |
| 560nm | 42.0% | 25.5% |
| 580nm | 41.6% | 25.0% |
| 589nm | 41.4% | 24.8% |
| 600nm | 41.3% | 24.6% |
| 620nm | 40.8% | 24.2% |
| 640nm | 40.6% | 23.9% |
| 650nm | 40.4% | 23.6% |
| 660nm | 40.2% | 23.4% |
| 680nm | 39.8% | 22.9% |
| 700nm | 39.2% | 22.4% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 43.0%.
R1 shown in black, R2 shown in red
Colour in reflected light:
White
Internal Reflections:
none
Chemistry of Kurilite
Mindat Formula:
Ag8Te3Se
Elements listed:
Crystallography of Kurilite
Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
R3
Cell Parameters:
a = 15.8135(18) Å, c = 19.618(3) Å
Ratio:
a:c = 1 : 1.241
Unit Cell V:
4,248.56 ų (Calculated from Unit Cell)
Z:
18
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.201 Å | (100) |
| 2.996 Å | (50) |
| 2.510 Å | (30) |
| 2.079 Å | (30) |
| 3.727 Å | (20) |
| 2.152 Å | (20) |
| 2.046 Å | (20) |
Comments:
Prasolovskoe deposit, Kuril Islands, Russia.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-𝑇 alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Kurilite
General Appearance of Type Material:
It usually forms aggregates, up to 2 mm in size, of micron-sized brittle xenomorphic grains within quartz.
Place of Conservation of Type Material:
Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia, as 3717/1.
Geological Setting of Type Material:
Hydrothermal vein.
Associated Minerals at Type Locality:
Synonyms of Kurilite
Other Language Names for Kurilite
Common Associates
Related Minerals - Strunz-mindat Grouping
| 2.BA. | Orileyite | (Fe,Cu)2As |
| 2.BA. | Alburnite | Ag8GeTe2S4 |
| 2.BA. | Dzierżanowskite | CaCu2S2 |
| 2.BA. | Makotoite | Ag12(Cu3Au)S8 |
| 2.BA. | Xuwenyuanite | Ag9Fe3+Te2S4 |
| 2.BA.05 | Chalcocite | Cu2S |
| 2.BA.05 | Djurleite | Cu31S16 |
| 2.BA.05 | Geerite | Cu8S5 |
| 2.BA.05 | Roxbyite | Cu9S5 |
| 2.BA.10 | Anilite | Cu7S4 |
| 2.BA.10 | Digenite | Cu9S5 |
| 2.BA.15 | Bornite | Cu5FeS4 |
| 2.BA.20 | Bellidoite | Cu2Se |
| 2.BA.20 | Berzelianite | Cu2-xSe (x ≈ 0.12) |
| 2.BA.25 | Athabascaite | Cu5Se4 |
| 2.BA.25 | Umangite | Cu3Se2 |
| 2.BA.30 | Rickardite | Cu7Te5 |
| 2.BA.30 | Weissite | Cu2-xTe |
| 2.BA.35 | Acanthite | Ag2S |
| 2.BA.35 | Spryite | Ag8(As3+0.5As5+0.5)S6 |
| 2.BA.40 | Mckinstryite | Ag5-xCu3+xS4 |
| 2.BA.40 | Stromeyerite | AgCuS |
| 2.BA.40d | UM2003-13-S:AgAuCu | Ag6AuCu2S5 |
| 2.BA.42 | Honeaite | Au3TlTe2 |
| 2.BA.45 | Jalpaite | Ag3CuS2 |
| 2.BA.45 | Selenojalpaite | Ag3CuSe2 |
| 2.BA.47 | Spiridonovite | (Cu1-xAgx)2Te |
| 2.BA.50 | Eucairite | AgCuSe |
| 2.BA.50 | Wuyanzhiite | Cu2S |
| 2.BA.52 | Argentite | Ag2S |
| 2.BA.55 | Aguilarite | Ag4SeS |
| 2.BA.55 | Naumannite | Ag2Se |
| 2.BA.60 | Cervelleite | Ag4TeS |
| 2.BA.60 | Hessite | Ag2Te |
| 2.BA.60 | Chenguodaite | Ag9Fe3+Te2S4 |
| 2.BA.65 | Henryite | (Cu,Ag)3+xTe2 , with x ~ 0.40 |
| 2.BA.65 | Stützite | Ag5-xTe3, x = 0.24-0.36 |
| 2.BA.70 | Argyrodite | Ag8GeS6 |
| 2.BA.70 | Canfieldite | Ag8SnS6 |
| 2.BA.70 | Putzite | (Cu4.7Ag3.3)GeS6 |
| 2.BA.75 | Fischesserite | Ag3AuSe2 |
| 2.BA.75 | Penzhinite | (Ag,Cu)4Au(S,Se)4 |
| 2.BA.75 | Petrovskaite | AuAgS |
| 2.BA.75 | Petzite | Ag3AuTe2 |
| 2.BA.75 | Uytenbogaardtite | Ag3AuS2 |
| 2.BA.80 | Bezsmertnovite | (Au,Ag)4Cu(Te,Pb) |
| 2.BA.80 | Bilibinskite | PbCu2Au3Te2 |
| 2.BA.80 | Bogdanovite | (Au,Te,Pb)3(Cu,Fe) |
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 Kurilite
mindat.org URL:
https://www.mindat.org/min-2294.html
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References for Kurilite
Reference List:
Burke, Ernst A. J. (2006) A mass discreditation of GQN minerals. The Canadian Mineralogist, 44 (6) 1557-1560 doi:10.2113/gscanmin.44.6.1557
Kovalenker, V. A., Plotinskaya, O. Yu., Stanley, C. J., Roberts, A. C., McDonald, A. M., Cooper, M. A. (2010) Kurilite – Ag8Te3Se – a new mineral from the Prasolovskoe deposit, Kuril islands, Russian Federation. Mineralogical Magazine, 74 (3) 463-468 doi:10.1180/minmag.2010.074.3.463
Localities for Kurilite
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.
Canada | |
| Garagan (2014) |
Indonesia | |
| Li et al. (2019) |
Russia | |
| Vikentyev (2015) |
| Ayupova et al. (2015) +1 other reference |
| Буханова (2018) |
| Clark (1993) |
| V.A. Kovalenker (2005) +1 other reference |
USA | |
| Aird et al. (2021) |
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Prasolovskoe Au deposit, Kunashir Island, Yuzhno-Kurilsky District, Kuril Islands, Sakhalin Oblast, Russia