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Laumontite Crystals

Laumontite from malad india

About Laumontite crystals

Named Laumonite by Abraham Gottlieb Werner in 1805 in honor of Francois Pierre Nicolas Gillet de Laumont, Inspector General of Mines who first found the mineral. The name was changed to its current spelling, Laumontite, in 1821 by Karl Cäsar von Leonhard.

Laumontite is not a crystal for everyone because it requires special care. When freshly collected, if it has not already been exposed to the environment, it can be translucent or transparent.

Laumontite easily dehydrates when stored in a low-humidity environment. That’s why it normally turns opaque white within hours to days after the collection due to the loss of water. The dehydrated laumontite is very friable, often falling into a powder at the slightest touch.

It is found in hydrothermal deposits left in calcareous rocks, often formed as a result of secondary mineralization. Host rock types include basalt, andesite, metamorphic rocks, and granites. It forms at a temperature of about 100°C (212°F), and becomes unstable above about 150°C (302°F), and so its presence in sedimentary rocks indicates that these have experienced intermediate diagenesis.

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