Chemical Composition: Ca2Al2Si3O10(OH)2 Cleavage: Good Color: Yellow-green, brown-yellow Crystal System: Orthorhombic Form/Habit: Tabular, botryoidal masses Fracture: Uneven Gravity: 2.82-2.94 Hardness: 6- 6.5 Luminescence: Yellowish-white (long wave) / Blueish-white (short wave) Luster: Vitreous to pearly Streak: White Transparency: Transparent, translucent
Where does Prehnite come from?
Prehnite deposits are located in Austria, Canada, India, Italy, Mali, Morocco, Namibia, Spain, Tanzania and the United States.
What is Prehnite?
Prehnite is a carbonate Copper Silcate mineral. Silicate minerals are the largest family of minerals, including more than 25% of all known minerals and 40% of all common minerals. In addition to being a major part of the Earth’s crust, Silicate minerals have also been found on the moon and in meteorites. Silicates are minerals which contain the elements Silicon (a light gray shiny metal) and Oxygen (a colorless gas). Together, these two elements form a tetrahedron – a shape similar to a pyramid – with a Silicon atom in the center and Oxygen atoms at each of the four corners. These tetrahedra connect with other chemical structures, in six different ways, to form various minerals and rocks. There are six main groups of Silicate minerals, and these main groups are further subdivided into secondary subdivisions, such as Quartz and Feldspar. Prehnite belongs to the Phyllosilicate group, whose tetrahedra connect at three corners to form hexagonal rings. This group also includes such well-known minerals as Chrysocolla, Fuchsite, Lepidolite, Prehnite, Seraphinite, and Serpentine.
Julie Abouzelof is the owner of Moonrise Crystals and an advocate for responsibly sourced gems and minerals. Her first career was in education teaching history, geology and anthropology, as well as working with special-needs students. She is now a heart-centered entrepreneur who encourages mindfulness and positive action to heal ourselves and the world. Julie lives in Hawaii with her lover and a little parrot named Darwin.