Teak |
| Species |
|---|
| Tectona grandis Tectona hamiltoniana Tectona philippinensis |
Teak (Tectona), also called jati is a genus of tropical hardwood trees in the family Verbenaceae, native to the south and southeast of Asia, and is commonly found as a component of monsoon forest vegetation. They are large trees, growing to 30-40 m tall, deciduous in the dry season.
The word teak originated from the word 'tekku' in Malayalam, the language of Kerala state in South India.
There are three species:
The timber is used in the manufacture of outdoor furniture, boat decks, and other articles where weather resistance is desired. It is also used for indoor flooring and as a veneer for indoor furnishings.
Teak is easily worked and has natural oils that make it suitable for use in exposed locations, where it is durable even when not treated with oil or varnish. Teak cut from old trees grown slowly in natural forests is more durable and harder; teak from young trees grown in plantations is more prone to splitting and water damage.
Teak is used extensively in India to make doors and window panes, furniture and columns and beams in old type houses. It is very resistant to the attack of termites. The mature teak fetches a very good price. The age of the tree can be assessed from the annular rings formed every year inside the trunk. Teak is grown extensively by forest departments of different states in forest areas.
Its popularity has led to growth in sustainable production throughout the seasonally dry tropics in forestry plantations. Teak does not grow in the rainforest and its consumption encompasses a different set of environmental concerns, such as the disappearance of rare old-growth teak. Experiments are on to arrive at vegetative propagation from one year old stem cuttings.
Popular in the 1950s and 1960s in a style often known as Danish modern, teak furniture has had a second boom in popularity. Teak is one of the most sought-after types of vintage furniture.
Teak is used as a food plant by the larvae of moths of the genus Endoclita including E. aroura, E. chalybeatus, E. damor, E. gmelina, E. malabaricus, E. sericeus and E. signifer and other Lepidoptera including Turnip Moth.
Much of the world's teak is exported by Indonesia and Myanmar.
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Much of the world's teak is exported by Indonesia and Myanmar. Topaz is also the birthstone of November. signifer and other Lepidoptera including Turnip Moth. According to Rebbenu Bachya, the word "Leshem" in the verse Exodus 28:19 means "Topaz" and was the stone on the Ephod representing the tribe of Dan. sericeus and E. In the Middle Ages the name topaz was used to refer to any yellow gemstone, but now the name is only properly applied to the silicate described above. malabaricus, E. The name "topaz" is derived from the Greek topazos, "to seek," which was the name of an island in the Red Sea that was difficult to find and from which a yellow stone (now believed to be a yellowish olivine) was mined in ancient times. gmelina, E. It can be found in the Ural and Ilmen mountains, Czech Republic, Saxony, Norway, Sweden, Japan, Brazil, Mexico, and the United States. damor, E. Topaz is found associated with the more acid rocks of the granite and rhyolite type and may be found with fluorite and cassiterite. chalybeatus, E. A recent trend in jewelry is the manufacture of topaz specimens that display iridescent colors, by applying a thin layer of titanium oxide via physical vapor deposition. aroura, E. It can also be irradiated, turning the stone a light and distinctive shade of blue. Teak is used as a food plant by the larvae of moths of the genus Endoclita including E. When heated, yellow topaz often becomes reddish-pink. Teak is one of the most sought-after types of vintage furniture. They may also be white, gray, green, blue, or reddish-yellow and transparent or translucent. Popular in the 1950s and 1960s in a style often known as Danish modern, teak furniture has had a second boom in popularity. Pure topaz is transparent but is usually tinted by impurities; typical topaz is wine or straw-yellow. Experiments are on to arrive at vegetative propagation from one year old stem cuttings. Topaz has a hardness of 8, a specific gravity of 3.4-3.6, and a vitreous lustre. Teak does not grow in the rainforest and its consumption encompasses a different set of environmental concerns, such as the disappearance of rare old-growth teak. The fracture is conchoidal to uneven. Its popularity has led to growth in sustainable production throughout the seasonally dry tropics in forestry plantations. It has an easy and perfect basal cleavage and so gemstones or other fine specimens should be handled with care to avoid developing cleavage flaws. Teak is grown extensively by forest departments of different states in forest areas. It crystallizes in the orthorhombic system and its crystals are mostly prismatic terminated by pyramidal and other faces, the basal pinacoid often being present. The age of the tree can be assessed from the annular rings formed every year inside the trunk. The mineral topaz is a silicate of aluminium and fluorine with the chemical formula Al2SiO4(F,OH)2. The mature teak fetches a very good price. This article is about the mineral or gemstone, for other uses see: Topaz (disambiguation).. It is very resistant to the attack of termites. Mineral galleries. Teak is used extensively in India to make doors and window panes, furniture and columns and beams in old type houses. Mindat with location data. Teak cut from old trees grown slowly in natural forests is more durable and harder; teak from young trees grown in plantations is more prone to splitting and water damage. Webmineral. Teak is easily worked and has natural oils that make it suitable for use in exposed locations, where it is durable even when not treated with oil or varnish. It is also used for indoor flooring and as a veneer for indoor furnishings. The timber is used in the manufacture of outdoor furniture, boat decks, and other articles where weather resistance is desired. There are three species:. The word teak originated from the word 'tekku' in Malayalam, the language of Kerala state in South India. They are large trees, growing to 30-40 m tall, deciduous in the dry season. Teak (Tectona), also called jati is a genus of tropical hardwood trees in the family Verbenaceae, native to the south and southeast of Asia, and is commonly found as a component of monsoon forest vegetation. Tectona philippinensis (Philippine Teak) is endemic to the Philippines, and is also endangered. Tectona hamiltoniana (Dahat Teak) is a local endemic species confined to Myanmar, where it is endangered. Tectona grandis (Common Teak) is by far the most important, with a wide distribution in India and Indo-China. |