Longulite is a rare mineral that belongs to the Eudialyte group and typically forms in igneous rocks. This complex silicate is primarily composed of sodium, calcium, zirconium, iron, and oxygen, with traces of other elements such as aluminum, titanium, and fluorine. Its name is derived from the Latin word "longus," meaning long, alluding to its elongated crystal habit.
Longulite crystals are usually observed in prismatic or tabular forms, with distinct striations on their surfaces. They can occur in various colors including shades of pink, red, brown, and black. The mineral possesses a vitreous to greasy luster, and its translucent to opaque nature gives it a unique visual appeal.
In terms of its physical properties, longulite has a relatively high hardness on the Mohs scale, typically ranging from 5.5 to 6.5. Its specific gravity also varies, usually falling within the range of 2.8 to 3.2. Longulite is soluble in acids and is non-magnetic.
While longulite is not a widely recognized mineral, it is prized by mineral collectors due to its rarity and unique crystal formations. It is often found in association with other minerals such as aegirine, nepheline, and feldspars, in alkaline igneous rock environments.
In summary, longulite is a rare and visually appealing mineral that forms elongated crystals in igneous rocks. It has distinct physical properties, making it a sought-after specimen among mineral enthusiasts.
