Russian amazonite is the green to blue-green variety of microcline feldspar produced principally from the Ilmen Mountains in the southern Urals and from the Kola Peninsula in the far northwest of European Russia. Russian deposits have been worked since the eighteenth century and supplied the Imperial workshops with material for hardstone carvings, decorative panelling, and small ornamental objects, including pieces produced by the House of Fabergé. The combination of saturated colour, occasional fine albite striping, and large block size has made Russian amazonite one of the standards against which amazonite from other sources is judged, alongside the more recently exploited Colorado, Madagascan, and Brazilian deposits.

Mineralogy and colour

Amazonite is the green-coloured variety of microcline, KAlSi₃O₈, the potassium feldspar end-member of the alkali feldspar series. The colour is attributed in modern mineralogical literature to lattice defects associated with traces of lead and structural water, with the chromophore mechanism distinct from the iron-based colouring of much green feldspar. Russian amazonite typically displays a saturated medium to deep blue-green, sometimes with white striping or zoning produced by intergrown albite or by twinning of the microcline structure. The mineral is opaque to translucent, takes a good polish, and has the standard feldspar hardness of 6 to 6.5 on the Mohs scale.

Sources

The Ilmen Mountains in Chelyabinsk Oblast in the southern Urals are the historical Russian source of amazonite, exploited from the eighteenth century onward as part of a wider programme of Imperial mineralogical exploration. Ilmen deposits produced large block material suitable for hardstone carving and panelling, and the locality is noted for the richness of its mineralogical inventory more broadly. The Kola Peninsula, on the Barents Sea coast, has produced amazonite since the early twentieth century, with deposits associated with the alkaline igneous complexes of the Khibiny and Lovozero massifs.

Use in Imperial and Soviet decorative arts

Russian amazonite was used by the Imperial workshops at Peterhof and Yekaterinburg for hardstone tabletops, vases, and architectural elements during the late eighteenth and nineteenth centuries, and the material appears in Fabergé hardstone work and in some of the smaller decorative objects produced for the Imperial court. Soviet-period decorative work continued to use amazonite for large-scale architectural panels and presentation items. The combination of large block size, attractive colour, and good workability made the material a staple of the Russian decorative-stone tradition for nearly two centuries.

Modern trade

Russian amazonite remains in production, though commercial volumes from the country have been reduced compared with the historical period. Material from the Ilmen and Kola sources circulates in the international trade alongside Colorado-origin material from the Pikes Peak batholith and amazonite from Brazil, Madagascar, and other newer sources. Russian-origin material is generally identifiable by its colour saturation and the typical inclusion suite, though laboratory determination of geographic origin is not a standard service for amazonite as it is for the major coloured stones.

In the trade and the workshop

Amazonite is cut and polished primarily as cabochons, beads, ornamental objects, and inlay material rather than as faceted stones. The cleavage at near right angles in two directions requires careful tool selection, and the relative softness limits the material to pendants, brooches, and protected ring designs rather than daily-wear ring stones. Russian-origin material is the traditional benchmark for colour and is preferred by carvers and designers working in the historical Russian tradition.

Further reading

• GIA Gems & Gemology — feldspar reference
• International Gem Society — amazonite