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Wednesday, 8 July 2020

Gemmology — gemstones — characteristics, classification, specimens, library
Smoky quartz


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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Simple colour schemeredorangey redreddish orangeorangeorangey yellowyellowgreenish yellowyellowish greenslightly yellowish greengreenvery slightly bluish greenbluish greenvery strongly bluish greengreen-blue or blue-greenvery strongly greenish bluevery slightly greenish bluebluevioletish bluebluish violetvioletbluish purplepurplereddish purplestrongly purplish redslightly purplish redcolourlessgreyblack
Topaz — specimen 0500

Some exceptional specimens of gemstones from our ‘Repository’

More specimens of gemstones
Spinel — specimen 0041
Milky quartz — specimen 0042
Indicolite — specimen 0043
Milky quartz — specimen 0044

— 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.

eclogite — a mafic (basaltic in composition) metamorphic rock
ekanite — species of mineral
elbaite — species of mineral; see elbaite in ‘Classification’
emerald — variety of beryl; see emerald in ‘Classification’

Vernadsky, W., 1913 — Über die chemische Formel der turmaline — Published in 1913 in ‘Zeitschrift für Krystallographie und Mineralogie’; contains the original description of the mineral elbaite.
Anthony, J. W., Bideaux, R. A., Bladh, K. W., Nichols, M. C. (Eds), 2001—2005 — Enstatite — Features the data of enstatite; from ‘Handbook of Mineralogy’.