Ivsite

Chemical formula: Na₃H(S₆+O₄)₂

Ivsyt is a rare, water-soluble sodium sulfate, forming tiny, colorless crystals in volcanic fumaroles.

## Characteristics Ivsyt is a hydrated sodium sulfate, occurring as very small, colorless, tabular or lath-like crystals, rarely exceeding 0.2 mm in length. It typically forms aggregates, efflorescences, and crusts. Due to its water solubility, it is an unstable mineral in humid environments and requires special storage conditions. ## Physical Properties Ivsyt crystals exhibit a vitreous luster. This mineral is soft and brittle. Its density, calculated from crystallographic data, is approximately 2.48 g/cm³. ## Colors and Varieties Ivsyt is colorless. No colored varieties are known. ## History and Name The mineral was discovered in the products of fumarolic activity at Tolbachik volcano in Kamchatka, Russia. Its name, approved by IMA in 2014, comes from the acronym IVS (Institute of Volcanology and Seismology) of the Russian Academy of Sciences, in recognition of the institution's contribution to the study of volcanoes and mineral-forming processes. ## Uses Ivsyt has no industrial applications. It is solely an object of scientific and collecting interest due to its rarity and specific formation environment.

Properties

Mohs hardness: 2.5
Luster: Vitreous
Streak: White
Density: 2.48
Cleavage: Perfect on {100}
Fracture: Uneven
Transparency: Transparent
Crystal system: Monoclinic

Diagnostic features

## Identification A diagnostic feature of ivsyt is its occurrence as tiny, colorless crystals in volcanic exhalation products (fumaroles). A key test is its immediate reaction with water – the mineral dissolves. However, identification requires advanced analytical methods, such as X-ray diffraction (XRD) or spectroscopy. ## Distinguishing from Similar Minerals Ivsyt can be confused with other colorless, soluble sulfates found in the same environment, such as metathenardite or thenardite. Distinguishing them "in the field" or visually in a collection is practically impossible and requires specialized laboratory analysis. ## Crystal Forms It forms very small, thin, tabular or lath-like crystals, often grouped into small aggregates, crusts, and efflorescences on the surface of volcanic rock.

Geological environment

## Genesis Ivsyt is a mineral of volcanic origin. It forms through sublimation from volcanic gases in high-temperature fumaroles (above 400°C). It crystallizes directly from the gas phase on the walls of channels and in their surroundings. ## Mineral Associations It co-occurs with other fumarolic minerals such as hematite, thenardite, metathenardite, aphthitalite, langbeinite, halite, sylvine, and krassnovite. ## Locations The only confirmed locality for ivsyt worldwide is its type locality – Arsenatnaya fumarole on the second northern cone of the Great Fissure Eruption of Tolbachik volcano in Kamchatka, Russia.

Rarity

Very rare

For collectors

## Quality Criteria The quality of an ivsyt specimen primarily depends on the richness and quantity of crystals on the rock matrix. Since the crystals are microscopic, specimens with dense, well-visible efflorescences under magnification are most valued. Contrast with dark volcanic rock enhances aesthetic appeal. Specimen stability (adequate protection from moisture) is crucial for its value. ## Popular Localities All specimens available on the collector's market originate from a single location worldwide – Tolbachik volcano in Kamchatka.

Care and storage

## Cleaning This mineral must absolutely not be cleaned wet. It is water-soluble and will be destroyed upon contact with water or even humid air. Mechanical cleaning is inadvisable due to its extreme brittleness and small crystal size. The safest way to remove dust is with a soft, dry brush or a photographic air blower. ## What to Avoid Avoid contact with water, water vapor, and all liquids. The mineral is hygroscopic and absorbs moisture from the environment, leading to its disintegration. It should be protected from humidity changes and stored away from heat sources. ## Storage Ivsyt specimens must be stored in sealed, airtight containers (e.g., "perky boxes") with a desiccant (e.g., silica gel). Exposure to open air is impossible and leads to rapid degradation of the specimen.

Sources

IMA Mineral List (CNMNC)