Crocobelonite

Chemical formula: CaFe³⁺₂O(PO₄)₂

Crocobelonit is a rare phosphate mineral with a characteristic saffron-red color, forming acicular crystals.

## Characteristics Crocobelonit is a phosphate mineral belonging to the brackebuschite group. It occurs as very small, acicular or bladed crystals, which often form radial aggregates or rosettes. Its most characteristic feature is an intense, saffron-red to reddish-pink color, which distinguishes it from other phosphate minerals. ## Physical Properties This mineral has a hardness of approximately 4 on the Mohs scale. It has an orange streak and a vitreous luster. It is translucent to opaque. Its density is about 3.56 g/cm³. ## Colors and Varieties Crocobelonit occurs in uniform, vivid shades of red – from saffron to reddish-pink. No distinct color varieties or commercial varieties are recognized. ## History and Name The mineral's name comes from the Greek words κρόκος (krokos) meaning saffron and βελόνη (belone) meaning needle, which directly refers to its typical color and crystal habit. It was described as a new mineral in 2020 based on specimens found in Jordan. ## Uses Due to its rarity and small crystal size, crocobelonit has no industrial applications. It is solely an object of interest for collectors specializing in rare or phosphate minerals.

Properties

Mohs hardness
4-0
Luster
Vitreous
Streak
orange
Density
3.555
Cleavage
In two directions for Crocobelonite-2O and one direction for Crocobelonite-1M
Fracture
Uneven
Transparency
Translucent to opaque
Crystal system
Orthorhombic

Diagnostic features

## Identification Key diagnostic features of crocobelonit are its unique saffron-red color, orange streak, and acicular crystal habit, often forming radial aggregates. Its occurrence in a specific geological environment (phosphorites) is also an important clue. ## Distinguishing from Similar Minerals This mineral can be confused with other red or orange phosphates. Distinguishing it from them often requires advanced analytical methods, such as Raman spectroscopy or chemical analysis (EDS), due to the small size of the crystals. ## Crystal Forms Crocobelonit forms elongated, acicular or bladed crystals. Most often, they occur as radial or stellate aggregates, as well as chaotic clusters on the surface of the host rock.

Geological environment

## Genesis Crocobelonit is a secondary mineral, forming in the oxidation zones of phosphorite deposits. It forms as a result of hydrothermal or diagenetic processes occurring in sedimentary rocks rich in phosphorus, under conditions of elevated temperature. ## Mineral Associations This mineral co-occurs with other phosphates, such as fluorapatite, as well as with calcite and quartz. ## Localities The only confirmed occurrence (type locality) of crocobelonit is an unnamed phosphorite quarry in the Daba-Siwaqa complex, on the Transjordanian plateau in Jordan. This is the only known locality of this mineral in the world.

Rarity

Very rare

For collectors

## Quality Criteria The most prized crocobelonit specimens are those with well-formed, clearly visible acicular crystals forming aesthetic, radial aggregates. The intensity and saturation of the saffron-red color are crucial. Specimens where red crystals contrast with a lighter host rock are also highly valued. ## Popular Localities The only source of crocobelonit specimens is its type locality in Jordan. All specimens available on the collector's market originate from this single location.

Care and storage

## Cleaning Crocobelonit specimens should be cleaned with the utmost care, using a soft brush to remove dust. Due to its delicacy and potential reactivity, contact with water and any chemical agents should be avoided. ## What to Avoid Avoid ultrasonic cleaners, chemical agents (acids, bases, solvents), high temperatures, and prolonged exposure to direct sunlight, which can cause the intense color to fade. ## Storage It is recommended to store specimens in stable conditions, in closed boxes or display cases, away from dust, humidity, and sudden temperature changes. Due to its low hardness, it should be protected from contact with harder minerals to prevent scratches.

External references

Sources

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