Jingsuiite

Chemical formula: TiB<sub>₂</sub>

Jingsuiite is an extremely rare titanium boride, a natural analogue of a synthetic ceramic material, found exclusively in meteorites.

## Characteristics Jingsuiite is a natural, hexagonal form of titanium boride (TiB₂). It occurs as microscopic, subhedral grains not exceeding several tens of micrometers in size, usually as inclusions in other minerals. Due to its size, visual features cannot be assessed with the naked eye. In reflected light, it is grayish-white with a yellowish tint. ## Physical Properties As a mineral of extreme hardness, jingsuiite is one of the hardest known minerals, surpassed only by diamond and moissanite. Its Mohs hardness is estimated at 9.5. It has a metallic luster and is opaque. The density calculated based on the formula and cell parameters is 4.52 g/cm³. ## History and Name The mineral was officially recognized by the International Mineralogical Association (IMA) in 2009 (IMA2009-057). Its name honors Jing-sui, a mythical Chinese spirit or deity associated with Mount Lu-fu Shan, referring to the fact that the mineral was discovered in China. The first description comes from chromitite found in the Luobusha ophiolite in Tibet. ## Applications Jingsuiite has no practical applications due to its extreme rarity and microscopic size. Its synthetic counterpart, titanium boride, is an important ceramic material used in the production of armor, cutting tools, and abrasion-resistant materials. For science and collecting, it is significant only as a unique extraterrestrial mineral and one of the hardest in nature.

Properties

Mohs hardness: 9.5
Luster: Metallic
Streak: Gray
Density: 4.52
Cleavage: None
Fracture: Uneven
Transparency: Opaque
Crystal system: Hexagonal

Diagnostic features

## Identification Identification of jingsuiite is possible only through advanced laboratory techniques, such as scanning electron microscopy (SEM) with chemical composition analysis (EDS) and electron diffraction. Its extreme hardness is a key feature, but impossible to test in practice on microscopic grains. ## Distinguishing from similar minerals Due to its unique occurrence environment (meteorites) and chemical composition, it is difficult to confuse with other minerals. In laboratory conditions, it is distinguished from other hard minerals, such as moissanite (SiC) or diamond (C), based on its chemical composition (presence of titanium and boron). ## Crystal forms It is observed in the form of very small, subhedral (partially developed) grains and aggregates.

Geological environment

## Genesis Jingsuiite is a mineral of extraterrestrial origin. Its formation is associated with the high pressure and temperature conditions prevailing during the formation of certain types of meteorites. It is found in ureilites – a rare class of stony achondrites. ## Mineral associations This mineral co-occurs with other minerals typical of ureilites. In the Almahata Sitta meteorite, it was found alongside graphite, diamond, niningerite, schreibersite, troilite, and rare phases such as brezinaite and oldhamite. ## Localities The only confirmed localities for jingsuiite are: - The Almahata Sitta meteorite, which fell in 2008 in the Nubian Desert, Sudan. - Chromitite from the Luobusha ophiolite in Tibet, China (type locality).

Rarity

Extremely rare

For collectors

## Quality criteria As a microscopic mineral, jingsuiite is not evaluated based on typical collector criteria such as color, form, or purity. The collector's value lies in the parent specimen (meteorite) in which the presence of this mineral has been identified. The value of such a specimen is enhanced by the scientifically confirmed presence of such a rare mineral phase. ## Popular localities The only source of specimens available on the collector's market is the Almahata Sitta meteorite. Fragments of this meteorite are highly prized by collectors.

Care and storage

## Cleaning Due to its microscopic size and occurrence as inclusions, individual jingsuiite grains are not subject to cleaning. Parent specimens (meteorites) should be cleaned according to the recommendations for the specific type of meteorite; typically, water and chemicals are avoided. ## What to avoid Specimens containing jingsuiite (mainly meteorites) should be protected from moisture, which can cause corrosion of other minerals in the matrix, especially iron. All chemicals and ultrasonic cleaning should be avoided. ## Storage Store in a dry environment, preferably in a specialized box with a desiccant. Protect from dust and mechanical damage.

Sources

IMA Mineral List (CNMNC)