Voggite

Chemical formula: Na<sub>2</sub>Zr<sup>4+</sup>(PO<sub>4</sub>)(CO<sub>3</sub>)(OH)·2H<sub>2</sub>O

Voggite is a rare zirconium mineral, found as small, colorless to white crystals in alkaline pegmatites.

## Characteristics Voggite is a very rare, complex mineral from the phosphate and carbonate group, containing zirconium. It occurs as very small, bladed or acicular crystals, rarely exceeding 1 mm in length. It usually forms small, radial aggregates or occurs as single, scattered crystals on the surface of other minerals. It is colorless to white and has a vitreous luster. ## Physical Properties Voggite crystals are flexible and exhibit perfect cleavage in one direction. The Mohs hardness is approximately 3. This mineral is transparent to translucent. Due to the small size of the crystals, most physical properties are difficult to measure precisely. ## Colors and Varieties The mineral is usually colorless or white. No colored or commercial varieties are known. ## History and Name The name Voggite comes from the names of Adolf Vogg (born 1931) and his son Peter Vogg (born 1959), Swiss mineral collectors who discovered this mineral. It was first described in 1991 by Stefan Graeser, Walter F. Oberholster, Peter Stuker, and Reiner Gest after being found in a quarry in Switzerland. ## Uses Voggite has no industrial application. Due to its rarity and microscopic size, it is solely a mineral of scientific and collecting importance, sought after by specialized collectors of rare mineral species.

Properties

Mohs hardness
3
Luster
Vitreous
Streak
White
Density
2.78
Cleavage
Perfect on {100}
Fracture
Uneven
Transparency
Transparent to Translucent
Crystal system
Monoclinic

Diagnostic features

## Identification Identification of Voggite requires specialized analytical equipment, such as X-ray diffraction (XRD) or chemical microanalysis (EDS/WDS), due to its microscopic size and co-occurrence with other rare minerals. Visually, it is characterized by the presence of small, colorless, bladed crystals. ## Distinguishing from Similar Minerals It can be confused with other secondary, colorless minerals found in the same environment, such as catapleiite or elpidite. Differentiation with the naked eye is practically impossible and requires advanced laboratory analysis. ## Crystal Forms Voggite forms elongated, bladed or acicular crystals, often grouped into radial or chaotic aggregates. The crystals are elongated along the [010] axis and flattened.

Geological environment

## Genesis Voggite is a secondary mineral, forming in the late stage of crystallization within nepheline syenite pegmatites. It forms in vugs and fractures, likely as a result of hydrothermal solutions acting on previously crystallized zirconium minerals, such as eudialyte. ## Mineral Associations This mineral co-occurs with other rare minerals of alkaline pegmatites, such as catapleiite, eudialyte, aegirine, analcime, natrolite, microcline, elpidite, and petersenite-(Ce). ## Localities The most important and type locality for Voggite is the Poudrette quarry in Mont Saint-Hilaire, Quebec, Canada. It has also been found at the type locality in the Francon quarry, on Montreal Island, Canada, as well as in the Ilimaussaq alkaline complex in Greenland.

Rarity

Very rare

For collectors

## Quality Criteria For collectors, the size and quality of the crystals are most important, although these rarely exceed a millimeter. The most desirable specimens are those with well-formed, sharply terminated crystals, forming aesthetic groups on a contrasting matrix. A rich association with other rare minerals from a given locality is also important. ## Popular Localities By far the most prized and known Voggite specimens come from the Poudrette quarry in Mont Saint-Hilaire, Canada. This is the classic locality for this mineral, providing the best known specimens in the world.

Care and storage

## Cleaning Specimens should only be cleaned with compressed air to remove dust. Due to the delicacy and reactivity of the crystals, contact with water and any chemical agents should be avoided. ## What to Avoid Avoid ultrasonic cleaners, chemical agents, acids, and bases. The crystals are very small and fragile, so they should be protected from any impact or abrasion. The mineral is soluble in acids. ## Storage Voggite specimens, due to their microscopic size, should be stored in specialized "micromount" boxes, which protect them from dust and mechanical damage. Exposure to moisture and contamination should be avoided.

Sources

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