The mineral Hexagonite is a type of Tremolite that is transparent and colored pale lilac to pink and purple. It exhibits pleochroic colors: red-tinted blue to violet- tinted red. The mineral is formed into facets. There is a lot of magnesium, more than iron present in this Tremolite mineral. But in Actinolite, the presence of iron is more than magnesium.
Ca2Mg5Si8O22 (OH) 2
Derivation of Name
Tremolite obtained its name Hexagonite since it acquired the shape of a hexagon; however, later on it appeared as a monoclinic crystal form.
Hexagonite occurs in metamorphic rocks, in the deposits of Serpentine, skarns and hornfels. Generally it occurs in the metamorphosed marble of Dolomite and Calcite, besides, it occurs as a minor mineral in igneous rocks of Diabase and Basalt.
Hexagonite is not made use of as a gemstone.
The source of Hexagonite is: St. Lawrence Country, Bamat-Edwards Zinc District, Edwards. New York, USA.
Hexagonite is a substitute name for the Tremolite mineral, the one and only Amphibole in the form of asbesti, which is of less use in industries in the production of asbestos. Earlier Hexagonite was referred to as a different mineral, but in actual practice it is a type of Tremolite. Even though it exhibits properties of pseudo-hexagonal, in reality it is monoclinic. It is the manganese that gives it the color. Hexagonite exists as prismatic crystals in elongated form, in fibrous, columnar, acicular, reticulated and in blade groups. Besides, it is found in the form of radiated sheaf of wheat; just like masses of fine hairs and also strong fibers that are interlocked that has a massive appearance.
The normal color of this mineral is a Lilac-pink
5 – 6 Mohs