Stamp: Tourmaline (Kenya 1977)
Tourmaline (Kenya 1977)
09 December (Kenya ) within release Minerals goes into circulation Stamp Tourmaline face value 2 Kenyan shilling
| Stamp Tourmaline in catalogues | |
|---|---|
| Michel: | Mi:KE 105 |
Stamp is horizontal format.
Also in the issue Minerals:
- Stamp - Aquamarine face value 3;
- Stamp - Tourmaline face value 2;
- Stamp - Selenite face value 10;
- Stamp - Trona face value 20;
- Stamp - Kyanite face value 30;
- Stamp - Amazonite face value 40;
- Stamp - Galena face value 50;
- Stamp - Fossilized Wood face value 70;
- Stamp - Fluorite face value 80;
- Stamp - Amethyst face value 1;
- Stamp - Agate face value 1.50;
- Booklet - Galena booklet face value 5;
- Booklet - Minerals face value 10;
Stamp Tourmaline it reflects the thematic directions:
A gemstone (also called a fine gem, jewel, precious stone, semiprecious stone, or simply gem) is a piece of mineral crystal which, when cut or polished, is used to make jewelry or other adornments. Certain rocks (such as lapis lazuli, opal, and obsidian) and occasionally organic materials that are not minerals (such as amber, jet, and pearl) may also be used for jewelry and are therefore often considered to be gemstones as well.Most gemstones are hard, but some softer minerals such as brazilianite may be used in jewelry because of their color or luster or other physical properties that have aesthetic value. However, generally speaking, soft minerals are not typically used as gemstones by virtue of their brittleness and lack of durability
In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid substance with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form
