AUSSIE PREHNITE SLAB THIN
Aussie Prehnite Slab Thin ready for making into a beautiful piece of jewellery. Stunning thin large piece with good translucency and slightly tumble polished. Prehnite is named after its discoverer Colonel Hendrik von Prehn. An attractive collection mineral that is occasionally used for ornamental stone purposes and jewellery. Its colour is a pleasant green and is at times quite unique to Prehnite. Typical formations are rather thick crusts with a rough or crystaline texture.
Wave Hill, Northern Territories, Australia.
10.1cm x 6.7cm x 0.4cm, 55g.
Calcium Aluminum Silicate Hydroxide.
Prehnite: Ca2 Al2 Si3 O10(OH)2.
Prehnite is often found with zeolites and is sometimes thought of as a zeolite. But zeolites are actually tectosilicates and prehnite is a member the Phyllosilicates Subclass. However, like zeolites, prehnite can give off water when heated, but can not gain the water back like they can. Like most zeolites, prehnite is formed as a result of low grade metamorphism usually from hydrothermal solutions. Crystals can be found in cavities of mafic igneous rocks.
Minerals that can be confused with prehnite include gyrolite, smithsonite and hemimorphite. Prehnite is harder than all of these and lacks smithsonite’s unusual luster. Hemimorphite is usually blue and gyrolite is not as glassy. Prehnite can be associated with many beautiful minerals and can make a fine specimen on its own. Its colour, luster, associations and crystal habits make it a joy to own.