Very glassy opal specimen, with excellent transparency and yellowish bands. From an unusual area of Russia for this variety of quartz. It was acquired by A. Trigo (Mataró) in 1983, in Expominer Mineral Show (Barcelona).

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These mix of crystals are showing hexagonal forms and analysis reports that they are related to Ruthenium crystals, with Osmium and Iridium. It is not easy to specify that if this or that crystal is Ru or Os, usually in this nuggets both elements could be present in different percentages. We will send analysis to the buyer.

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Nakauriite is a rare hydrated magnesium and copper carbonate, but old formula was Cu8(SO4)4(CO3)(OH)6·48H2O. The sulphate content, originally reported, seems to be questionable according to literature; the crystalline structure is unknown. Palenzona and Martinelli (2007) suggest a formula (Mg,Cu)x(CO3)y(OH)z·nH2O (x, y, z unknown). It appears as fibrous and nodular aggregates of bluish color embedded in the matrix of tremolite/talc. This specimen has an unusual size and is very rich. It comes from the abandoned chromite mines in Ufalei chromite deposits.
Palenzona, A. & Martinelli, A. (2007): La nakauriite del Monte Ramazzo, Genova. Rivista Mineralogica Italiana, 31(1), 48-51.

Both minerals, hematite and talc, are relatively common, but what make up this piece not so common is this association. When I saw these pieces they immediately caught my attention. Huge size, aesthetic and brilliant crystals of hematite, of good size for the locality and for the species, rich in facets; they are included in a talc matrix, bright, scaly and green tones. Excellent and very interesting specimensa from the "deep" Russia.

Both minerals, hematite and talc, are relatively common, but what make up this piece not so common is this association. When I saw these pieces they immediately caught my attention. Huge size, aesthetic and brilliant crystals of hematite, of good size for the locality and for the species, rich in facets; they are included in a talc matrix, bright, scaly and green tones. Excellent and very interesting specimensa from the "deep" Russia.