Pargasite crystals in marble 438g, Vietnam

Composition: Pargasite is composed of a number of elements, including magnesium, iron, silicon, aluminum and hydrogen. Its chemical formula can be generally expressed as (Na,Ca)2-3(Mg,Fe2+)4Al(Al,Si)2Si6O22(OH)2.

Appearance: Pargasite crystals can be dark in color, usually green to black, and have a characteristic luster.

Occurrence in Marble: Pargasite is often found in metamorphic rocks such as marble. There are some known areas of pargasite-bearing marble in Vietnam, and some of these areas are known for their significant marble reserves.

Geological Significance: Pargasite marble has aesthetic value due to the contrast between the dark pargasite crystals and the light marble base. This type of marble is often used in construction and jewelry.

Additional information: Pargasite is an important mineral in the context of the geological processes that lead to the metamorphosis of rocks and the creation of different types of rock environments.