Stetindite-(Ce)

Chemical formula: Ce<sup>4+</sup>SiO<sub>4</sub>

Stetindite-(Ce) is a rare cerium silicate, forming tiny, isometric crystals of brown color with an adamantine luster.

## Characteristics Stetindite-(Ce) is a mineral belonging to the zircon group, characterized by the presence of cerium as the dominant rare-earth element. It occurs as very small, individual crystals with a regular, isometric structure, rarely exceeding 0.1 mm in size. The crystals are usually well-formed and take the shape of cubes or octahedra. Due to its small size, it is a mineral difficult to observe with the naked eye and requires magnification for identification. ## Physical Properties This mineral is characterized by high hardness, estimated at 7 on the Mohs scale, which is typical for minerals of the zircon group. It has an adamantine luster on crystal surfaces. It is a dense mineral, and its density, calculated based on the chemical formula and unit cell parameters, is 5.11 g/cm³. ## Colors and Varieties Stetindite-(Ce) has a characteristic brown to reddish-brown color. It is translucent. No color or commercial varieties have been distinguished. ## History and Name The mineral's name comes from its discovery locality – Stetind mountain (Stetinden) in Tysfjord municipality, Nordland county, Norway. The "-(Ce)" suffix in the name indicates the dominance of cerium among rare-earth elements in its chemical composition. It was officially approved as a new mineral by the International Mineralogical Association (IMA) in 2010 (IMA2010-033). It was described by T. V. Larsen, A. O. Larsen, H. F. Erambert, N. V. Shchipalkina, and G. K. Bekenova. ## Uses Stetindite-(Ce) has no industrial application due to its extreme rarity and microscopic size. It is of purely scientific interest and is an object of interest for specialized collectors of micromount minerals.

Properties

Mohs hardness
7
Luster
Adamantine
Streak
Light brown
Density
5.11
Cleavage
None
Fracture
Conchoidal
Transparency
Translucent
Crystal system
Cubic

Diagnostic features

## Identification Identification of stetindite-(Ce) is possible almost exclusively by laboratory methods, such as energy-dispersive spectroscopy (EDS/EDX) to confirm chemical composition (dominance of cerium and silicon) and X-ray diffraction (XRD) to determine crystal structure. Visually, under high magnification, characteristic, regular (isometric) crystals of brown color and strong, adamantine luster can be observed, which can be a diagnostic clue. ## Differentiation from Similar Minerals Stetindite-(Ce) can be confused with other minerals of the zircon group, such as zircon (ZrSiO₄) or thorite (ThSiO₄), which form similar crystals. Differentiation requires chemical analysis – zircon contains zirconium, and thorite contains thorium, while stetindite-(Ce) is characterized by the dominance of cerium. It differs from hafnon (HfSiO₄) by the absence of hafnium. ## Crystal Forms Stetindite-(Ce) crystals are isometric (regular) and very small, typically up to 0.1 mm in size. They most often adopt the form of cubes {100} or octahedra {111}, as well as combinations thereof.

Geological environment

## Genesis Stetindite-(Ce) forms in syenite pegmatites, which are igneous rocks rich in rare-earth elements and other rare elements. It is a late-stage crystallization mineral, forming in vugs and fractures within the rock. ## Mineral Associations This mineral coexists with other minerals typical of syenite pegmatites. At the type locality (Stetind, Norway), it was found in association with aegirine, albite, quartz, microcline, zircon, thorite, astrophyllite, lorenzenite, and eudialyte. ## Localities The only confirmed and described occurrence of stetindite-(Ce) in the world is its type locality: a syenite pegmatite on Stetind mountain in Tysfjord, Nordland region, Norway.

Rarity

Extremely rare

For collectors

## Quality Criteria The quality of a stetindite-(Ce) specimen is primarily assessed based on the presence of well-formed, sharp, and undamaged microcrystals. Due to their small size, their number and distribution on the rock matrix are crucial. The color contrast between the brown stetindite crystals and a lighter background (e.g., white albite) significantly enhances the visual appeal of the specimen. The most valuable samples are those with clearly visible, isolated crystals exhibiting strong luster. ## Popular Localities The only source of specimens is the type locality in Norway. Material from this location is extremely rare and sought after by collectors specializing in micromounts and rare-earth element minerals.

Care and storage

## Cleaning Specimens containing stetindite-(Ce) should be handled with utmost care. These are typically microscopic minerals on a delicate rock matrix. Cleaning should be limited to very gently removing dust with a photographic air blower or compressed air from a safe distance. Do not use water or any chemical agents, which could damage both the mineral itself and the host rock. ## What to Avoid Avoid contact with chemicals, acids, and bases. Ultrasonic cleaning is absolutely forbidden, as it can cause microscopic crystals to detach from the substrate. Protect the specimen from shocks, drops, and abrasion. ## Storage Microscopic stetindite-(Ce) specimens should be stored in specialized "micromount" boxes, which protect them from dust and mechanical damage. A label with precise locality and identification is crucial. Store in stable conditions, away from vibrations and sources of contamination.

Sources

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