How do I identify Eveslogite?

Eveslogite can be identified by its hardness of 5 on the Mohs scale, light-brown or yellow-brown color. Look for these key characteristics when examining specimens.

What color is Eveslogite?

Eveslogite typically appears in light-brown or yellow-brown. Color can vary depending on impurities and formation conditions.

How hard is Eveslogite?

Eveslogite has a hardness of 5 on the Mohs scale. This gives it moderate hardness.

Eveslogite

A variety of Minerals

What is Eveslogite?

Eveslogite is a complex inosilicate mineral with a chemical formula (Ca,K,Na,Sr,Ba)48(Ti,Nb,Fe,Mn)12(OH)12Si48O14414 found on Mt. Eveslogchorr in Khibiny Mountains, on the Kola peninsula, Russia. It was named after the place it was found. This silicate mineral occurs as an anchimonomineral veinlet that cross-cuts poikilitic nepheline syenite. This mineral appears to resemble yuksporite, as it forms similar placated fine fibrous of approximately 0.05 to 0.005mm that aggregates outwardly. The color of eveslogite is yellow or rather light brown. In addition, it is a semitransparent mineral that has a white streak and a vitreous luster. Its crystal system is monoclinic and possesses a hardness (Mohs) of 5. This newly discovered mineral belongs to the astrophyllite group of minerals and contains structures that are composed of titanosilicate layers (Krivovichev et al., 2004). Limited information about this mineral exists due to the few research studies carried out since its recent discovery.

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Eveslogite Localities Map

See where Eveslogite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.

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North ZoneCentral RidgeSouth Basin

Key Characteristics

Characteristics of Eveslogite

Eveslogite is a titanosilicate mineral that falls under the group of astrophyllite and fits within the point and space group P2/m {P1 1 2/m} {P2/m} {P1 2/m 1}. It is a mineral that is light brown or yellowish in color. It has a silky structure with white streak. Its tenacity is brittle and an indistinctly perfect cleavage of {001} and {010}. In regard to its general appearance, as explained by Chukanov et al. 2008, this mineral is indistinguishable from yuksporite and other related titanosilicate. In addition, the article American Mineralogist further expounds on both the measured and calculated densities of this mineral. After measuring the density of eveslogite it recorded a total of 2.85 g/cm3 but when directly calculated, it recorded a slightly higher density of 2.93 g/cm3. Additionally, the physical characteristics of eveslogite include a fracture that is largely splintery and a rough semitransparent gold like appearance.

Composition of Eveslogite

Eveslogite is a complex titanosilicate made up of numerous elements including silicon, sodium, calcium and potassium. Its chemical formula is (Ca,K,Na,Sr,Ba)48(Ti,Nb,Fe,Mn)12(OH)12Si48O14414, with the number of atoms in the chemical formula being 298.4. The listed elements in the formula are Ba, Cl, Ca, Fe, F, H, K, Mn, O, Sr, Si and Ti. The table below shows the composition of elements and their relative weight. In addition, this mineral has the empirical formula Ca22.46K12.27Na10.3Sr1.8Ba1.25Ti5.53Nb3.34Mn3+0.95Fe2+0.83Fe3+0.2Zr0.19Rb0.14Ta0.08 (OH)12Si47.3Al0.41O138.08(OH)9.42Cl0.8 and a molecular weight of 6,800.28 grams. Due to this form of composition, eveslogite’s structure has been observed to resist characterization because of its poor diffraction of its crystals and also due to its small dimensions (Chukanov et al., 2008). The aspect of characterization has been made possible after the late 20th century discovery of the 3rd generation X-ray synchrotron sources that made it possible to structurally characterize various mineral elements that could not have been characterized using the in-house X-ray sources (Burzo, 2006).