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— A product of decomposition of beryl in pegmatites, and in low-temperature alpine veins (Anthony et al., 2001—2005). Extremely rare gemstone.

Specimen figured

Euclase — specimen 0319weight: 0.92 ct; shape: oval. Very clean specimen; very good mixed style cut. Source: Donna and John Rhoads, D&J Rare Gems, Ltd.


The section ‘Classification’ presents descriptions of 163 different kinds of natural gemstones (104 mineral species). The Nickel-Strunz systematic order (10th edition) is used. Specimens of the classes shown below are currently available. Since gemmology does not always follow the systematics of minerals in naming, many popular varieties or just ’names’ are also listed.

Classes after Nickel-Strunz

1. Elements
2. Sulphides & sulphosalts
3. Halides
4. Oxides & hydroxides
5. Carbonates (Nitrates)
6. Borates
7. Sulphates
8. Phosphates, arsenates, vanadates
9. Silicates


— In granite and metamorphosed carbonate rocks associated with hydrothermal activity (Anthony et al., 2001—2005).

Specimen figured

Danburite — specimen 0122weight: 0.41 ct; shape: round. Very clean specimen; very good Portuguese style cut. Source: David Weinberg, Multicolour Gems Ltd.
Danburite — specimen 0122