Heflikite

Chemical formula: Ca₂(Al₂Sc)(Si₂O₇)(SiO₄)O(OH)

Heflikite is a very rare sorosilicate mineral, discovered in Poland, forming colorless to light gray, tabular crystals.

## Characteristics Heflikite is a mineral belonging to the epidote group, specifically the allanite subgroup. It was approved as a new mineral by the IMA in 2014. It forms very small, tabular crystals, reaching up to 0.3 mm in size, which often occur as aggregates. It is colorless to light gray, with a pinkish-white tint, and exhibits a vitreous luster. ## Physical Properties Heflikite crystals are brittle. Its Mohs hardness is 6. This mineral does not exhibit fluorescence under ultraviolet light. ## History and Name The mineral's name honors Professor Wiesław Heflik (born 1938), a Polish mineralogist and petrographer from the AGH University of Science and Technology in Kraków, in recognition of his contribution to the study of minerals from Lower Silesia. It was discovered in amphibolite in the Jordanów Śląski quarry in Lower Silesia, Poland, which is its only known locality (type locality).

Properties

Mohs hardness
6-0
Luster
Vitreous
Streak
white
Density
3.537
Cleavage
Good on {001}
Fracture
Uneven
Transparency
Transparent to translucent
Crystal system
Monoclinic

Diagnostic features

## Identification Identification of heflikite is only possible using advanced analytical methods, such as X-ray microanalysis (EDS/WDS) and X-ray diffraction (XRD), due to its occurrence as microscopic crystals. Visual identification in the field or in a collection is impossible. ## Differentiation from Similar Minerals It can be confused with other minerals from the epidote group, such as clinozoisite, epidote, or allanite, with which it coexists. Differentiation requires specialized chemical analysis to reveal the characteristic presence of scandium in heflikite. ## Crystal Forms It forms small, tabular crystals with a platy habit, often grouped into irregular aggregates. The crystals are usually poorly formed.

Geological environment

## Genesis Heflikite forms as a result of metamorphic processes. It occurs in amphibolite rocks that have undergone metamorphism under amphibolite facies conditions. Its formation is associated with metasomatic changes within these rocks. ## Mineral Associations It coexists with minerals such as amphiboles (from the tremolite-actinolite series), clinozoisite, epidote, allanite-(Ce), titanite, apatite, prehnite, quartz, albite, microcline, and minerals from the chlorite group. ## Localities The only confirmed occurrence of heflikite in the world is the serpentinite quarry in Jordanów Śląski, about 30 km south of Wrocław, on the Fore-Sudetic Block (Lower Silesia, Poland).

Rarity

Extremely rare

For collectors

## Quality Criteria As a mineral of purely scientific significance and typical of its type locality, the value of a specimen depends on the confirmation of heflikite's presence through analysis. The most valuable samples are those with the largest and best-formed, though still microscopic, crystals, rich in associated minerals. These specimens are of interest to specialized collectors of rare minerals and microminerals. ## Popular Localities The only source of specimens is its type locality - the quarry in Jordanów Śląski, Poland.

Care and storage

## Cleaning Due to its extreme rarity and small crystal size, heflikite specimens should not be cleaned mechanically or chemically. Any intervention risks irreversible damage or loss of material. ## What to Avoid Contact with any chemicals, ultrasound, and sudden temperature changes should be avoided. Specimens should be protected from dust and moisture. ## Storage Heflikite specimens, typically in their host rock (amphibolite), are best stored under stable conditions, in enclosed "micromount" boxes, to prevent mechanical damage and dust accumulation. Observation is only possible under a microscope.

External references

Sources

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