Dickite is a clay mineral named after the
metallurgical chemist Allan Brugh Dick, who first
described it. It is chemically composed of
20.90% aluminium, 21.76% silicon, 1.56%
hydrogen and 55.78% oxygen. Dickite takes on
the appearance of a white, brown earthy color
and is often found embedded in many other
minerals such as quartz, whereas it often
contains impurities such as titanium, iron,
magnesium, calcium, sodium and potassium.
in 1888, Allan Brugh Dick (1833–1926), a Scottish
metallurgical chemist, was on the island of
Anglesey to conduct research on kaolin. He
performed various experiments describing the
clay mineral, today known by his name. It was not
until 1931 though that two other chemists
Clarence S. Ross and Paul F. Kerr looked closer
at the mineral and concluded that it was different
from the known minerals of kaolinite and thus
named it after him.
The Neolithic Age was a period in the
development of human technology, beginning
about 10,200 BC, in some parts of the Middle
East, later in other parts of the world and ending
between 4500 and 2000 BC.
Traditionally considered the last part of the Stone
Age, the Neolithic period commenced with the
beginning of farming, which produced the
"Neolithic Revolution". It ended when metal tools
became widespread in the Copper, Bronze or iron
Age. The Neolithic is a progression of behavioral
and cultural characteristics and changes,
including the use of wild and domestic crops and
of domesticated animals.
Unlike during the Paleolithic, only one human
species (Homo sapiens sapiens) existed in the
Neolithic.
The term Neolithic derives from the Greek ????
néos, "new" and ????? líthos, "stone", literally
meaning "New Stone Age". The term was
invented by Sir John Lubbock in 1865 as a
refinement of the three-age system.
Intricate artefacts such as this crouching
zoomorphic figurine have been recovered around
the shores of Lake Van.
Lake Van is the largest lake in Turkey and lies in
the far east of that country in the provinces of
Van and Bitlis, in the highest and largest region of
Turkey.
- (OF.135)
|
