Gemmology
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Wednesday, 26 September 2018


Gemmology — gemstones — characteristics, classification, specimens, library
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GEMMOLOGY — GEMSTONES

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 172 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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Classification
Featured

Kyanite

— In gneisses, schists, included pegmatites, and quartz veins, from regional metamorphism of sedimentary rocks (Anthony et al., 2001—2005).
Kyanite

The section ‘Repository’ contains data and photos of 756 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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Repository
Amethyst — specimen 0675

Some exceptional specimens of gemstones from our ‘Repository’

More specimens of gemstones
Chrysoberyl — specimen 0166
Opal — specimen 0167
Johachidolite — specimen 0174
Jadeite — specimen 0200

— 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 392 terms.
Library
Glossary

smithsonite — species of mineral; see smithsonite in ‘Classification’
smoky quartz — variety of quartz; see smoky quartz in ‘Classification’
snowflake obsidian — variety of obsidian; see snowflake obsidian in ‘Classification’
sodalite — species of mineral; see sodalite in ‘Classification’
Publications

Lorenzen, J., 1884 — Undersøgelse af Mineralier fra Grønland — Published in 1884 in ‘Meddelelser om Grønland’; contains the original description of the mineral kornerupine.
Anthony, J. W., Bideaux, R. A., Bladh, K. W., Nichols, M. C. (Eds), 2001—2005 — Chromdravite — Features the data of chromium-dravite; from ‘Handbook of Mineralogy’.