Hingganite-(Ce)

Chemical formula: BeCe<sup>3+</sup>(SiO<sub>4</sub>)(OH)

Hingganite-(Ce) is a rare beryllium and cerium silicate, forming small, vitreous crystals with a greenish or pinkish hue in pegmatites and granites.

## Characteristics Hingganite-(Ce) is a mineral from the gadolinite group, belonging to the silicates. It typically forms very small, prismatic or acicular crystals, often gathered in radial or fan-shaped aggregates. Specimens rarely exceed a few millimeters in length. Crystals can be poorly formed, although forms with distinct faces do occur. It is a transparent to translucent mineral with a vitreous luster. ## Physical Properties This mineral is characterized by a hardness of 5-6 on the Mohs scale, making it relatively scratch-resistant. Its density is quite high for a silicate, around 4.25 g/cm³. The luster is typically vitreous, and the mineral does not exhibit distinct cleavage, having an uneven fracture. ## Colors and Varieties The most common colors of hingganite-(Ce) are shades of green – from pale green, through grayish-green, to yellowish-green. Specimens also occur in pink, purplish, brown, and colorless varieties. Color variation depends on impurities of other rare earth elements. ## History and Name The mineral's name comes from its type locality – the Greater Khingan Mountains (Da Hinggan Ling) in Inner Mongolia (China), where it was discovered. The "-(Ce)" suffix in the name indicates the dominance of cerium as a rare earth element in its chemical composition. It was described as a new mineral in 1981 by X. Ding, G. Bai, Z. Liu, and Z. Ruan. ## Uses Due to its rarity and small crystal size, hingganite-(Ce) has no industrial applications. It is solely an object of interest for collectors specializing in rare minerals, especially those containing rare earth elements.

Properties

Mohs hardness
5-6
Luster
Vitreous
Streak
White
Density
4.25
Cleavage
Indistinct on {100}
Fracture
Uneven
Transparency
Transparent to Translucent
Crystal system
Monoclinic

Diagnostic features

## Identification Identifying hingganite-(Ce) under amateur conditions is very difficult. Clues may include its specific occurrence environment (granitic pegmatites), radial aggregates of small, prismatic crystals, and co-occurrence with other rare earth minerals. Positive identification requires advanced analytical methods, such as EDS/WDS spectroscopy to confirm its chemical composition. ## Distinguishing from Similar Minerals It can be confused with other silicates forming radial aggregates, such as epidote, tourmaline (elbaite), beryl, or vesuvianite. Differentiation is based on hardness, density, and most importantly, chemical analysis, which will show the presence of beryllium and cerium. Many minerals from the gadolinite group look almost identical. ## Crystal Forms Crystals are typically elongated, prismatic, terminated by a bipyramid. They often form fan-shaped, radial, or spherulitic aggregates. Less commonly, they occur as single, well-formed crystals.

Geological environment

## Genesis Hingganite-(Ce) is a mineral of hydrothermal or pegmatitic origin. It forms in the late stages of crystallization of alkaline granites and pegmatites, rich in rare earth elements, beryllium, and fluorine. It crystallizes in miarolitic cavities and small rock voids. ## Mineral Associations It most commonly co-occurs with minerals such as: quartz, microcline, albite, fluorite, aegirine, riebeckite, zircon, bastnäsite-(Ce), allanite-(Ce), gadolinite-(Y), and other rare earth minerals. ## Localities Key and classic localities for this mineral include, among others: alkaline complexes on the Kola Peninsula in Russia (Koashva Mountain, Khibiny Massif); Mont Saint-Hilaire in Quebec, Canada; the area around Zagi Mountain in Pakistan; the Evans-Lou mine in Quebec, Canada; and the type locality in Inner Mongolia, China.

Rarity

Rare

For collectors

## Quality Criteria The most valued specimens by collectors are those with well-formed, sharp, and transparent crystals of intense, attractive coloration (e.g., pink or green). Rich radial aggregates contrasting with the host rock (matrix), such as white albite or quartz, are also highly prized. Due to their small size, quality and aesthetics at the micro scale are crucial. ## Popular Localities Specimens from Mont Saint-Hilaire in Canada and Zagi Mountain in Pakistan are particularly sought after due to the good quality of their crystals and attractive mineral associations. Russian specimens from the Kola Peninsula are also highly regarded by collectors specializing in pegmatitic minerals.

Care and storage

## Cleaning Specimens should only be cleaned with lukewarm distilled water and a very soft brush or paintbrush. Ultrasonic cleaners should be avoided, as they can damage delicate crystals and their aggregates. ## What to Avoid The mineral is sensitive to strong acids. Avoid sudden temperature changes and prolonged exposure to direct sunlight, although there is no evidence of it fading. ## Storage It is recommended to store specimens in separate, padded collector's boxes to protect them from mechanical damage and contact with harder minerals. Due to the small size of the crystals, "micromount" type boxes are ideal.

Sources

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