Morningstarite

Chemical formula: Na(W⁶⁺₂.₆₇Fe³⁺₀.₃₃)O₉·H₂O

Morningstarite is an extremely rare tungstate mineral of cream to orange color, discovered in Australia.

## Characteristics Morningstarite is a hydrated sodium iron tungstate, occurring as microscopic, hexagonal platelets and rosettes. It forms thin coatings and aggregates on the surface of other minerals, mainly wolframite. Due to the extremely small size of its crystals, its visual features are difficult to observe without specialized equipment, and most specimens appear as earthy or powdery coatings. ## Physical properties Due to its microscopic nature, most physical properties, such as hardness, luster, or fracture, have not been precisely determined. The density calculated from the formula and unit cell parameters is approximately 6.4 g/cm³. ## Colors and varieties This mineral ranges in color from cream to orange. No varieties have been distinguished. ## History and name Morningstarite was first described in 2023 by a team of mineralogists (Elliott et al.). Its name comes from its discovery locality – the Morning Star Extended mine in Queensland, Australia. It is a mineral approved by the International Mineralogical Association (IMA2023-034). ## Applications Morningstarite has no industrial applications. Its significance is purely scientific and collectible, as a unique and newly discovered mineral species.

Properties

Density
6.4
Crystal system
Hexagonal

Diagnostic features

## Identification Identification of morningstarite is only possible using advanced analytical methods, such as Raman spectroscopy, X-ray diffraction (XRD), or electron microprobe chemical analysis (EDS/WDS). Field identification and "by eye" recognition in a collection are impossible. Its characteristic appearance is that of microscopic, hexagonal platelets forming rosettes on wolframite. ## Distinguishing from similar minerals It can be confused with other secondary tungsten minerals of similar colors, such as russellite or tungstite. Differentiation requires specialized laboratory analysis. ## Crystal forms Morningstarite forms very small, hexagonal crystals with a platy habit, which often combine into rosettes or spherical aggregates. It also occurs as thin coatings and crusts.

Geological environment

## Genesis Morningstarite is a secondary mineral, formed in the oxidation (weathering) zone of tungsten deposits. It forms as a result of the alteration of primary tungsten minerals, such as wolframite, under low temperature and pressure conditions, in the presence of sodium-rich solutions. ## Mineral associations This mineral occurs in direct proximity to wolframite, from which it forms. It also co-occurs with quartz, which constitutes the host rock (matrix) for the mineralization. ## Localities The only confirmed locality of morningstarite in the world is its type locality: Morning Star Extended mine, Bamford Hill, in the Mareeba Shire region, Queensland, Australia.

Rarity

Extremely rare

For collectors

## Quality criteria The quality of a morningstarite specimen is assessed based on the richness and visibility of the coatings on the host rock. The most valued specimens are those where the microscopic aggregates are clearly formed and cover a significant area. The color contrast with the surrounding quartz or wolframite also enhances visual appeal. Due to its microscopic nature, the quality of the accompanying photomicrograph is crucial. ## Popular localities The only source of specimens is the type locality in Queensland, Australia. All specimens available on the collector's market originate from this single location.

Care and storage

## Cleaning Morningstarite specimens should not be cleaned mechanically or chemically. Any attempts at cleaning may irreversibly damage the microscopic crystals. Only very careful removal of dust with a soft brush or a photographic air blower is permissible. ## What to avoid Avoid contact with water, acids, detergents, and any other chemicals. The mineral is likely sensitive to changes in temperature and humidity. It should not be heated or exposed to direct sunlight. ## Storage Specimens should be stored under stable conditions, preferably in a sealed, lidded "micromount" box, to protect them from dust, moisture, and mechanical damage. Display should be away from sources of vibration and direct light.

External references

Sources

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