Barkovite

Chemical formula: Ni<sub>1.5</sub>Sn

Barkowite is an extremely rare, newly discovered mineral from the nickel-tin alloy group, found in only one locality worldwide.

## Characteristics Barkowite is a new mineral, approved in 2023, belonging to the nickel-tin alloy group. It occurs as microscopic, anhedral (irregularly shaped) grains, typically not exceeding 20 micrometers in size. It is observed as inclusions within isoferroplatinum. Due to its size and mode of occurrence, its visual characteristics cannot be assessed with the naked eye. ## Physical Properties As a metallic mineral, barkowite exhibits a metallic luster. It is opaque. Its hardness and density have not yet been precisely measured due to the microscopic size of the grains; however, its hardness is estimated to be approximately 4 on the Mohs scale. In reflected light, its color is grayish-white. ## History and Name The mineral was named in honor of Andrei Vadimovich Barkov (born 1960), a Russian mineralogist and geochemist, in recognition of his contributions to the study of platinum-group minerals and related mineral systems. It was officially approved by the International Mineralogical Association (IMA) in 2023 (IMA2023-017). The discovery was made on material from the Kondyor intrusion in Khabarovsk Krai, Russia. ## Applications Due to its extreme rarity and microscopic size, barkowite has no commercial or industrial applications. It is solely an object of scientific interest and a valuable acquisition for specialized systematic collections and research institutions.

Properties

Mohs hardness
4
Luster
Metallic
Transparency
Opaque
Crystal system
Hexagonal

Diagnostic features

## Identification Identification of barkowite is possible only using advanced laboratory techniques. It requires analysis in reflected light under a polarizing microscope and confirmation of its chemical composition using an electron microprobe (EDS/WDS). Its characteristic features include its chemical composition (nickel-tin alloy) and co-occurrence with other specific minerals. ## Distinguishing from Similar Minerals Under the microscope, it can be confused with other microscopic metal alloys, such as taenite, tetrataenite, or other tin minerals. Definitive differentiation is only possible based on precise chemical analysis. ## Crystal Forms Barkowite occurs exclusively as anhedral (irregularly shaped), rounded grains up to 20 micrometers in size, most often as inclusions in isoferroplatinum.

Geological environment

## Genesis Barkowite forms in ultramafic, alkaline Alaskan-type intrusive complexes. It is a magmatic mineral, crystallizing in the late stages of formation of platinum-group element-rich rocks. Its type locality is the dunite-clinopyroxenite zone within the Kondyor intrusion. ## Mineral Associations This mineral occurs in close association with isoferroplatinum (as inclusions), tetraferroplatinum, bornite, chalcopyrite, cuprorhodsite, iridium, osmium, laurite, cuproiridsite, and other as-yet-unnamed platinum-group mineral phases. ## Localities The only confirmed locality for barkowite worldwide is its type locality: the Kondyor massif (intrusion), Aldan-Stanovoy suture, Khabarovsk Krai, Far Eastern Federal District, Russia.

Rarity

Extremely rare

For collectors

## Quality Criteria As a microscopic mineral, barkowite is not evaluated according to typical collector criteria such as color, crystal size, or transparency. The only criterion for value is the scientific confirmation of its presence in the sample. The most valuable specimens are those where barkowite grains are relatively "large" (several micrometers) and well-defined within the isoferroplatinum matrix, which facilitates their analysis. The value of a specimen is inextricably linked to its scientific documentation. ## Popular Localities The only source of specimens is the Kondyor massif in Russia. Material from this locality is extremely difficult to obtain and primarily goes to scientific institutions and highly specialized micromount collectors.

Care and storage

## Cleaning Specimens containing barkowite, due to its microscopic nature, do not require and should not undergo any mechanical or chemical cleaning procedures. Any attempt to clean the host rock (typically isoferroplatinum) may damage or remove the microscopic mineral grains. ## What to Avoid Avoid contact with any chemicals, acids, and ultrasonics. Do not heat the specimen or subject it to rapid temperature changes. Protect it from mechanical damage, such as scratches or impacts. ## Storage Specimens with barkowite should be stored under stable conditions, in specialized "micromount" boxes that protect them from dust, moisture, and physical damage. Storage in a dry place, away from direct sunlight, is crucial for preserving the integrity of the sample.

Sources

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