Chalcedony to as prase. However, the term prase is also used to describe green quartz, and to a certain extent is a color-descriptor, rather than a rigorously defined mineral variety.) Blue-colored chalcedony is sometimes referred to as "blue chrysoprase" if the color is sufficiently rich, though it derives its color from the presence of copper and is largely unrelated to nickel-bearing chrysoprase. Heliotrope is a green variety of chalcedony, containing red inclusions of iron oxide that resemble drops of blood, giving heliotrope its alternative name of bloodstone. In a similar variety, the spots are yellow instead, known as plasma. Moss agate
Mineral waters of Azerbaijan Mineral waters of Azerbaijan Mineral water containing different minerals, salts, biological active elements is popular from ancient times for its healing factor. Due to contained gases mineral water may be effervescent or "sparkling". There are more than 1000 unlimited mineral water resources in the Republic of Azerbaijan. Most of them are widespread over mountainous regions of the Republic. Absheron peninsula is famous not only for its beaches. Containing iodine, bromine and other elements mineral waters of Absheron peninsula made it much more popular. There are many healing springs in Surakhani, Mardakan, Buzovna, Bilga, Pirshagi, Shikhov . Sanatoriums, rest homes were