Description
Atlantisite is a combination of serpentine with stichtite.
The mineral serpentine, or clinochrysotile, is a magnesium-iron silicate with the chemical formula (Mg, Fe)3Si2O5(OH)4. It belongs to the phyllosilicate family. This amorphous mineral can be red, yellow, white, and green. The green color is typical of the mineral in the mantle rock serpentinite. Its hardness is 2.5 to 4, depending on the composition, and serpentine has an average density of 2.59. One of these minerals is classified as asbestos. Inhalation of this mineral is harmful to health. The mineral serpentine, like the rock serpentinite, is named after the Latin word serpens, meaning "snake." The shape in which the minerals have grown within the rock is reminiscent of a snake. It was also used in the past as a remedy for snakebites. The other name for serpentinite, clinochrysotile, is derived from the Greek words clinos, chrysos, and tilos ("crooked," "gold," and "fiber," respectively). It is so named because of the gold-colored, fibrous structure the mineral can assume. Serpentine is an indicative mineral for serpentinite, a peridotite often converted by hydrothermal activity. Under the influence of pressure and temperature, olivine and pyroxene from the mantle rock are converted into serpentine. This is sometimes called serpentinitization. The chemical reaction equation is: 4Mg2SiO4 (olivine) + 4H2O(l) + 2CO2(aq) → Mg6Si4O10(OH)8 (serpentine) + MgCO3 (magnesite) Serpentine is therefore a mineral found in areas where mantle rock has reached the surface, usually in orogens. In Greece and the Alps, serpentine is widely exposed.
Stichtite is a purple/pink stone often found in combination with serpentine. A stone with a combination of these two is also called atlantisite. Composition: Mg6Cr2(OH)16-4H2 & hardness: 1.5-2. Stichtite is found in Tasmania, among other places.
