Ural Emerald: Malyshevsky, Russia
Ural emerald from the Malyshevsky/Izumrudnye Kopi deposit; phlogopite mica inclusions diagnostic; Cr+V chromophores; mica-schist contact zone genesis.
Introduction
Ural emerald from the Malyshevsky deposit, also known as Izumrudnye Kopi
("Emerald Mines"), has been mined since discovery in 1831, approximately 90 km
northeast of Yekaterinburg. The deposit occupies the contact between granitic
pegmatites and Cr-enriched phlogopite mica schists, the same geological corridor
that produces Russian alexandrite. [1]
Diagnostic significance rests on phlogopite mica inclusions: brownish tabular
platelets parallel to cleavage planes, derived from the mica-schist host.
[2] These distinguish Ural material from the
three-phase "jardin" of Colombian Muzo and Chivor, the tremolite needles of
Sandawana (Zimbabwe), and the biotite mica of Zambia. Both Cr³⁺ and V³⁺ act as
chromophores, producing a warm medium green distinct from vivid Colombian material;
Li content exceeds 200 ppm, consistent with non-Colombian sources.
[3]
The Malyshevsky operation works intermittently; supply is not continuous. Russian
emerald is prized by collectors for its Ural provenance and for the characteristic
mica inclusions that make origin determination among the more straightforward
beryl assignments.
Geological Setting
Ural emerald genesis:
- Host rock: Phlogopite mica schist at the contact with granitic intrusions;
Laskovenkov and Zhernakov (1995) confirmed that the deposits consist of
"mica schists with phlogopite" along the Tokovaya River corridor [1] - Genetic model: Same as alexandrite: pegmatite supplies Be and Al;
Cr-enriched ultramafic/schist country rock supplies Cr; the intersection
of these sources at the contact zone enables beryl + Cr emerald formation - Deposit scale: Malysheva mine is the largest known emerald deposit in Russia;
operated intermittently in the post-Soviet period
Properties
| Property | Value |
|---|---|
| Formula | Be₃Al₂Si₆O₁₈ (beryl), Cr³⁺ + V³⁺ colouring |
| Crystal system | Hexagonal; uniaxial negative |
| RI | 1.577–1.583 (ω); 1.584–1.590 (ε); DR ~0.006–0.009 |
| SG | 2.72–2.77 |
| Hardness | 7.5–8 (Mohs) |
| Chromophores | Cr³⁺ (primary) + V³⁺ (secondary) |
| Fluorescence (LWUV) | Moderate red to orange-red; stronger than Colombian |
| Chelsea Colour Filter | Red (Cr³⁺ dominant) |
| Key absorption | 680 nm Cr doublet (strong); 637 nm; 477 nm; 430 nm cutoff |
Diagnostic Inclusions
Russian Ural emerald inclusion suite:
Primary Diagnostic: Phlogopite Mica
- Phlogopite mica flakes: Brownish, tabular platelets parallel to the
cleavage planes; the most characteristic and diagnostic inclusion for Ural
emerald origin [2] - These mica platelets derive directly from the phlogopite mica schist host rock
- Their brownish tabular habit distinguishes them from the calcite and pyrite
of Colombian emerald and from the tremolite needles of Sandawana (Zimbabwe)
Additional Inclusions
- Tremolite needles: Calcium-magnesium amphibole; slender, colourless
- Two-phase fluid inclusions: Liquid + gas
- Actinolite
- Apatite: Rounded crystals
- Pyrite: Present but less abundant than in Colombian material
Chromophore Profile
Cr³⁺ + V³⁺ in Ural emerald:
- Both Cr and V are present as colouring agents; this dual chromophore profile
gives a colour profile slightly different from purely V-dominated Brazilian
(Itabira/Carnaíba) material and from the high-Cr Sandawana - Compared to Colombian: less fluorescence (more Fe present); different colour
profile (Ural green tends toward warmer medium green rather than Colombian's
vivid pure green) - Compared to Zambian: similar Cr+V but different inclusion suite (Zambia has
biotite, not phlogopite; distinct talc and chlorite inclusions)
Origin Discrimination
| Feature | Ural (Russia) | Colombian (Muzo) | Sandawana (Zimbabwe) | Zambia |
|---|---|---|---|---|
| Primary inclusion | Phlogopite mica platelets | Parisite + halite in 3-phase | Tremolite needles | Biotite mica platelets |
| Pyrite | Present (minor) | Absent in Muzo; abundant in Chivor | Absent | Present |
| Chromophore | Cr + V | Cr dominant | Cr dominant (very high) | Cr + V |
| Fe content | Low | Very low | Very low | Moderate |
| Fluorescence (LWUV) | Moderate red–orange | Strong red | Very strong red | Moderate red |
| Li content | >200 ppmw (higher) [3] | <200 ppmw | >200 ppmw | >200 ppmw |
Market Notes
Ural emerald market position:
- Below Colombian in prestige and price; quality is variable; fine material is
attractive but Ural production does not achieve the colour saturation of top
Colombian or Sandawana - Malysheva deposit operates intermittently; supply is not continuous
- Russian emerald is prized by collectors for its historical interest and
characteristic mica inclusions
References
- ↑ 1. Laskovenkov, A.; Zhernakov, V. (1995). The Ural Emerald Mines. Gems & Gemology, 31(2), 106–115. DOI: 10.5741/gems.31.2.106.
- ↑ 2. Karampelas, S.; Al-Shaybani, B.; Mohamed, F. (2019). Emeralds from the Most Important Occurrences: Chemical and Spectroscopic Data. Minerals, 9(9), 561. DOI: 10.3390/min9090561.
- ↑ 3. Saeseaw, S.; Renfro, N.; Palke, A. (2019). Geographic Origin Determination of Emerald. Gems & Gemology, 55(4), 614–646. DOI: 10.5741/gems.55.4.614.