Suseinargiuite

Chemical formula: (Na₀.₅Bi³⁺₀.₅)Mo⁶⁺O₄

Suseinargiuite is a rare sodium bismuth molybdate, forming colorless, tabular crystals with a strong, adamantine luster.

## Characteristics Suseinargiuite is a mineral from the molybdate group, chemically classified as a sodium bismuth molybdate. It occurs as very small, thin, tabular crystals, reaching up to 0.1 mm in size. The crystals are typically colorless and transparent. A characteristic feature of the mineral is its very strong, almost adamantine luster, which distinguishes it from co-occurring minerals. ## Physical Properties The mineral is characterized by a high density of 5.597 g/cm³, which is a result of the presence of heavy bismuth in its structure. The luster is adamantine, and the crystals are transparent. Hardness has not been precisely determined, but due to its composition and kinship with other molybdates, it can be assumed that it is a relatively soft and brittle mineral. ## Colors and Varieties Suseinargiuite is colorless. No colored varieties are known. ## History and Name The mineral's name comes from its discovery locality - Punta de Su Seinargiu in the municipality of Sarroch, Sardinia, Italy. It was officially recognized by the International Mineralogical Association (IMA) in 2013. It is a relatively recently described mineral in scientific literature. ## Applications Due to its extreme rarity and microscopic crystal sizes, suseinargiuite has no industrial application. It is solely an object of scientific and collecting interest for specialized collectors of rare minerals (so-called micromounts).

Properties

Luster
Adamantine
Streak
White
Density
5.597
Transparency
Transparent
Crystal system
Tetragonal

Diagnostic features

## Identification Identification of suseinargiuite is possible almost exclusively using advanced analytical methods, such as Raman spectroscopy or EDS analysis, due to the microscopic size of the crystals. Visually, at the occurrence site, it can be suspected based on its form (thin, square tablets) and very strong, adamantine luster. ## Distinguishing from similar minerals It can be confused with other colorless secondary minerals with strong luster, such as cerussite or wulfenite, which may occur in similar environments. Differentiation without specialized equipment is practically impossible. Wulfenite often forms crystals with a yellow or orange coloration, which can be a clue. ## Crystal forms It forms very thin, tabular crystals with a square or rectangular outline. They occur as single, scattered flakes on the surface of the host rock.

Geological environment

## Genesis Suseinargiuite is a secondary mineral, formed in the oxidation zones (gossans) of polymetallic deposits. It forms as a result of the weathering of primary ore minerals containing bismuth and molybdenum in the presence of sodium-rich solutions. ## Mineral associations At the type locality (Punta de Su Seinargiu), it co-occurs with minerals such as anglesite, cerussite, chrysocolla, hemimorphite, malachite, as well as rarer ones: bismutite, sardignite, and wulfenite. ## Localities The only confirmed and described occurrence of suseinargiuite in the world is its type locality: Punta de Su Seinargiu in Sardinia, Italy.

Rarity

Extremely rare

For collectors

## Quality criteria For such a rare mineral, the only criterion is its confirmed presence on a fragment of the host rock. Every specimen is valuable to specialized collectors. Additional advantages may include the size of the crystals (even if they are fractions of a millimeter) and their quantity on the rock matrix. ## Popular localities The only source of specimens is the type locality in Sardinia, Italy.

Care and storage

## Cleaning Specimens with suseinargiuite, typically micromounts, do not require cleaning. If absolutely necessary, compressed air (from a safe distance) can be used to remove dust. Avoid contact with water and any chemicals. ## What to avoid Avoid ultrasonic cleaners, all chemical solvents, acids, and bases. The mineral is likely very brittle and sensitive to temperature changes. Protect it from direct sunlight and moisture. ## Storage Specimens should be stored exclusively in specialized micromount boxes to protect them from mechanical damage, dust, and contamination. The box should be kept under stable room conditions.

External references

Sources

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