Falottaite

Chemical formula: Mn²⁺(C₂)⁶⁺O₄·3H₂O

Falottaite is an extremely rare, water-soluble manganese oxalate, forming tiny, acicular crystals of a straw-yellow color.

## Characteristics Falottaite is a hydrated manganese oxalate, occurring as very small, acicular or hair-like crystals. They typically form radial aggregates or tangled, felt-like masses, growing on host rocks. Individual crystals are elongated, often flattened, and reach up to 1 mm in length with a thickness of only a few micrometers. Due to its delicate nature and small size, it is a mineral primarily accessible to specialized micromineral collectors. ## Physical Properties Falottaite crystals are elastic and flexible. This mineral is water-soluble. Its hardness and density have not been precisely determined due to the small size and fragility of the crystals. ## Colors and Varieties Falottaite occurs in a uniform, straw-yellow color. No color varieties or commercial forms are known. ## History and Name The mineral was approved by the IMA in 2013. Its name honors Dr. Annarita Falotta, an Italian mineral collector who found the first samples of this mineral. It was discovered in the Monte Alpe manganese ore mine in Liguria, Italy. ## Uses Falottaite has no industrial applications. Its significance is purely scientific and collectible, as a unique representative of the oxalate class.

Properties

Mohs hardness
2.5
Color
Colorless
Luster
Silky
Streak
White
Density
1.924
Transparency
Transparent
Crystal system
Orthorhombic

Diagnostic features

## Identification Characteristic features of falottaite include its straw-yellow color, acicular or hair-like crystal form creating radial or felt-like aggregates, and its extreme rarity. A key diagnostic feature is its water solubility. ## Distinguishing from Similar Minerals It can be confused with other secondary minerals of similar appearance, such as some sulfates or arsenates. However, its genesis in manganese deposits, co-occurrence with other oxalates (like lindbergite), and the water solubility test allow for its unambiguous differentiation. ## Crystal Forms Falottaite forms very fine, acicular or hair-like crystals that combine into radial, star-like aggregates or tangled, felt-like masses.

Geological environment

## Genesis It is a secondary mineral, formed as a result of hydrothermal processes or weathering within manganese ore deposits. Its formation is linked to the interaction of solutions rich in oxalic acid (of organic origin, e.g., from lichen decomposition) with manganese minerals. ## Mineral Associations Falottaite co-occurs with other manganese minerals and oxalates. In its type locality (Monte Alpe), it was found in association with braunite, cryptomelane, pyrochroite, rhodochrosite, and especially another oxalate – lindbergite. ## Localities The only confirmed occurrence of falottaite in the world is its type locality: the Monte Alpe manganese ore mine, located in the municipality of Maissana, La Spezia province, Liguria, Italy.

Rarity

Extremely rare

For collectors

## Quality Criteria The quality of falottaite specimens is assessed based on the richness and aesthetics of the crystal aggregates. Most valued are samples with well-formed, radial clusters of acicular crystals, contrasting with the dark host rock. Due to the microscopic nature of the mineral, the quality of the specimen under magnification is crucial. ## Popular Localities The only source of specimens is the Monte Alpe mine in Italy. Material from this locality is extremely difficult to obtain and appears on the collector's market sporadically, mainly circulating among micromineral specialists.

Care and storage

## Cleaning The mineral must absolutely not be wet-cleaned, as it is water-soluble. Specimens should only be cleaned with compressed air from a safe distance, using minimal pressure to avoid damaging the fragile crystals. ## What to Avoid Avoid all contact with water, cleaning solutions, and chemicals. The mineral is very sensitive to moisture and should therefore be protected from humid air. It is also very mechanically delicate. ## Storage Falottaite specimens must be stored in sealed, dry containers, preferably with a desiccant (e.g., silica gel). "Micromount" boxes are recommended to protect delicate crystals from physical damage and dust.

External references

Sources

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