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— Disseminated in metamorphic quartzites, schists and quartz veins; in the border zones of complex granite pegmatites (Anthony et al., 2001—2005). Faceted specimens are very rare.

Specimen figured

Lazulite — specimen 0066weight: 0.08 ct; shape: round. Very clean specimen; very good brilliant style cut. Source: John Bradshaw, Coast to Coast Rare Stones International.


The section ‘Classification’ presents descriptions of 171 different kinds of natural gemstones (106 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


— Also known as sphene; a common accessory mineral in intermediate and felsic rocks, pegmatites, and alpine veins; in gneisses, schists, and some skarns (Anthony et al., 2001—2005).

Specimen figured

Titanite — specimen 0313weight: 0.62 ct; shape: round. Very clean specimen; very good mixed style cut. Source: David Weinberg, Multicolour Gems Ltd.
Titanite — specimen 0313