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- Iceberg (3511 bytes)
5: ...blem is only a small manifestation of a more significant trouble.
11: ... Lomonosov]]. In the 20th century, several scientific bodies were established to study and monitor the...
21: ...November 2002. As of December 2004, the most significant remaining piece of it, [[iceberg B-15A]], wit...
58: [[he:קרחון]] - Gemstone (7411 bytes)
1: ... (as in [[lapis lazuli]]) or [[Petrification|petrified]] material that when cut or faceted and polishe...
4: ==Charateristics and classification==
5: ...b>). Next, many gems are crystals which are classified by [[crystal system]] such as [[cubic]] or [[tr...
7: Gems are classified into different ''groups'', ''species'' and ''va...
9: ...ispersion (optics)|dispersion]], a certain [[specific gravity]], a certain [[Mohs scale of mineral har...
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