Evenkite (Field of view is 8 mm) Locality: Slávik adit, Dubník, Červenica, Prešov Co., Prešov Region, Slovakia Original description: Aggregates of colourless evenkite in vugs of altered andesite. Evenkite was confirmed by PXRD (it is nearly impossible to prepare powder from this species :-D). Photo and collection: Martin Števko. — Photo: Martin Števko · CC BY-SA 3.0 de
Evenkite
A rare hydrocarbon mineral — essentially pure crystalline n-tetracosane wax — forming soft colorless-to-yellow crystals.
Intro adapted from Wikipedia (CC BY-SA).
Evenkite is an IMA-recognized mineral species in the organic mineral class, with the chemical formula C₂₃H₄₈.
It crystallizes in the orthorhombic crystal system (space group P2_1/a).
Key properties: Mohs hardness 1; specific gravity 0.92; optically biaxial.
IMA symbol Evk, grandfathered status — known before the IMA’s founding, named in 1953.
An accessory mineral in association with coal; in geodes in association with a vein cutting vesicular welded tuff (Evenkia district, Russia).
It is found associated with Chalcedony, quartz (Evenki district, Russia).
The name is derived from the locality in the Evenkia district, Lower Tunguska River, Siberia, Russia.