Phylloretine

Chemical formula: C<sub>18</sub>H<sub>18</sub>

Phylloretine is a rare, organic mineral (hydrocarbon), historically described as brittle, waxy flakes found in peat bogs.

## Characteristics Phylloretine is a naturally occurring aromatic hydrocarbon (1,7-dimethylphenanthrene), classified as an organic mineral. Its status as a distinct mineral species is questionable and it is not recognized by the International Mineralogical Association (IMA). It occurs as small, thin flakes or scales, as well as granular aggregates and coatings. It is very soft, brittle, and light. In appearance, it resembles wax or resin. ## Physical Properties It is characterized by very low hardness, about 1 on the Mohs scale, which means it can be scratched with a fingernail. It has a low density, similar to that of water. The luster is typically resinous, and the mineral itself is translucent. ## Colors and Varieties Most often it is whitish, yellowish, waxy-yellow, or brownish. No named varieties are distinguished. ## History and Name The name of the mineral, given in 1839 by Karl Ludwig von Reichenbach, comes from the Greek words *phyllon* (leaf) and *rhetine* (resin), which refers to its occurrence in the form of thin, leaf-like flakes in peat deposits. This substance is a product of the fossilization of plant matter. ## Uses Phylloretine has no industrial application. It is solely an object of scientific and collecting interest, as a rare and specific natural organic substance.

Properties

Mohs hardness
1
Luster
Resinous
Streak
White
Density
1.0 - 1.1
Cleavage
None
Fracture
Uneven
Transparency
Translucent
Crystal system
Monoclinic

Diagnostic features

## Identification Key diagnostic features include its unique occurrence environment (peat bogs, fossilized wood), extreme softness, very low density (the specimen is extremely light relative to its size), resinous luster, and occurrence in the form of thin flakes or scales. It is flammable. ## Distinguishing from Similar Minerals It can be confused with other fossil resins (e.g., retinite, krantzite) or other organic minerals. Differentiation would require advanced chemical analysis (determining the composition as 1,7-dimethylphenanthrene). From most resins, such as amber, it is distinguished by significantly lower hardness and brittleness. ## Crystal Forms It usually forms thin, platy or scaly aggregates. Granular forms and coatings have also been observed. Well-formed crystals in the microscopic sense are monoclinic, but are not found macroscopically.

Geological environment

## Genesis Phylloretine forms as a result of diagenetic processes occurring in an anaerobic environment. It is a product of the natural transformation of terpenoids (chemical compounds present in resins) derived from the wood of coniferous trees, mainly pine, buried in peat bogs. ## Mineral Associations It occurs in association with peat and fossilized, waterlogged pine wood (*Pinus sylvestris*). It may co-occur with other fossil resins. ## Localities The historical and main occurrence (type locality) is a peat bog near Griesstorf near Eckartsberg in Thuringia (Germany). This is the only well-documented locality, which emphasizes the uniqueness of this substance.

Rarity

Extremely rare

For collectors

## Quality Criteria Due to its extreme rarity, every authentic specimen is valuable. The most prized samples are those with the largest, undamaged flakes possible, as well as specimens showing a clear connection to the parent material, i.e., fossilized wood or peat. Confirmation of authenticity from the historical locality significantly increases its value. ## Popular Localities The only source of specimens of historical and collecting significance is the type locality in Thuringia, Germany. Obtaining material from this location is practically impossible today.

Care and storage

## Cleaning Specimens are extremely delicate. Wet cleaning should be avoided. Only very careful dust removal with a soft brush or a stream of compressed air from a distance is permissible. ## What to Avoid Contact with water, organic solvents, and all chemicals must be strictly avoided. The mineral is flammable and sensitive to elevated temperatures. It should be protected from direct sunlight, which can cause its degradation. ## Storage It is recommended to store it in a closed, padded "membrane box" or in a small container, at a stable temperature and away from light sources. It should be protected from shocks and pressure.

Sources

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