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Monday, 15 July 2024

Gemmology — gemstones — characteristics, classification, specimens, library


characteristics, classification, specimens, library

As gemstones we accept cut specimens of crystals of natural mineral species having a visible transparency and certain durability. From over 4800 known minerals (according to data of the International Mineralogical Association), approximately 150 satisfy the above conditions and form crystals of sufficient size to be cut.

The section ‘Classification’ presents descriptions of 171 different kinds of natural gemstones (106 mineral species). The Nickel-Strunz systematic order (10th edition) is used. Since gemmology does not always follow the systematics of minerals in naming, many popular varieties or just ’names’ are listed.

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

The section ‘Repository’ contains data and photos of 760 specimens of gemstones. The smallest is just 1.96 mm (0.02 ct) ruby from Mozambique, and the largest — 70.11 mm (326.60 ct) rock crystal from Africa. Besides there are 8 specimens of synthetic stones.

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Topaz — specimen 0585

Some exceptional specimens of gemstones from our ‘Repository’

More specimens of gemstones
Moonstone — specimen 0163
Magnesite — specimen 0164
Dolomite — specimen 0165
Chrysoberyl — specimen 0166

— More from ‘Repository

Currently there are 283 bibliographical references and abstracts to publications with gemmological or mineralogical thematics in the ‘Library’. The section comprises also a glossary with 391 terms.

ametrine — variety of quartz; see ametrine in ‘Classification’
amphiboles — an extensive and complex group of minerals
analcime — species of mineral; faceted specimens exist
anatase — species of mineral; faceted specimens exist

Jobbins, E. A., Tresham, A. E., Young, B. R., 1975 — Magnesioaxinite, a new mineral found as a blue gemstone from Tanzania — Published in 1975 in ‘Journal of Gemmology’; contains the original description of the mineral axinite-(Mg).
Anthony, J. W., Bideaux, R. A., Bladh, K. W., Nichols, M. C. (Eds), 2001—2005 — Epidote — Features the data of epidote; from ‘Handbook of Mineralogy’.