NATROLITE on PHILIPSITE, CAPE GRIM, officially Kennaook / Cape Grim, North-West Tasmania
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$100.00
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$100.00
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NATROLITE on PHILIPSITE, CAPE GRIM, officially Kennaook / Cape Grim, North-West Tasmania
$100.00
Sale price
$100.00
Regular price
Shipping calculated at checkout.
Natrolite is a mineral species classified as a tectosilicate and is part of the zeolite group. It is a hydrated sodium and aluminum silicate with the chemical formula Na2Al2Si3O10·2H2O, and its type locality is Hohentwiel in Hegau, Germany.
The mineral was named natrolite by Martin Heinrich Klaproth in 1803, with the name originating from the Greek word for soda, "natron," reflecting its sodium content, and "lithos," meaning stone. Informally referred to as needle stone or needle-zeolite, this designation highlights the typical acicular form of its crystals, which are often slender and arranged in divergent tufts. The crystals may also exhibit epitaxial overgrowths of natrolite, mesolite, and gonnardite in various configurations.
Phillipsite is a type of mineral that belongs to the zeolite group. It is a hydrated silicate made of potassium, calcium, and aluminum, with a formula close to (Ca,Na2,K2)3Al6Si10O32·12H2O. The different types in this series include phillipsite-K, phillipsite-Na, and phillipsite-Ca.
The crystals of phillipsite are monoclinic, but we only find complex twin shapes that look like harmotome twins, which also has a connection with phillipsite-Ca. However, phillipsite crystals are usually smaller and more see-through and glassy compared to harmotome. It's common to see spherical groups that have a fibrous structure and are covered with crystals on the outside. The hardness of phillipsite is 4.5 on the Mohs scale, and it has a specific gravity of 2.2. This mineral was first described by Armand Lévy in 1825 and was named after William Phillips. In France, it is sometimes called Christianite, a name given by A. Des Cloizeaux in 1847, after Christian VIII of Denmark.
Phillipsite is a mineral that forms secondarily and is found with other zeolites in the cavities of volcanic rocks, like in the basalt at the Giants Causeway in County Antrim and near Melbourne in Victoria, as well as in Lencitite close to Rome. Small crystals that formed recently have been seen in the walls of hot baths at Plombires and Bourbonne-les-Bains in France. Tiny spherical groups found in deep sea sediment were collected by the Challenger from the Pacific Ocean.
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