Correct spelling for the English word "vrbaite" is [vˌiːˈɑːbˈe͡ɪt], [vˌiːˈɑːbˈeɪt], [v_ˌiː__ˈɑː_b_ˈeɪ_t] (IPA phonetic alphabet).
Vrbaite is a relatively rare mineral that belongs to the phosphate mineral class. It is also known as alanrossite, named after the geologist Alan M. Ross who first discovered it. Vrbaite typically occurs as small, prismatic crystal formations in pegmatites or granite dykes, often alongside other phosphate minerals.
Chemically, vrbaite can be described as a hydrated magnesium calcium iron phosphate, with the chemical formula (Mg,Fe)(Al,Fe,Ca)2(PO4)2(OH)2·5H2O. It is characterized by its vitreous to resinous luster, which gives it a shiny appearance. Vrbaite exhibits a wide range of coloration, usually being yellow, brown, or reddish-brown, though it can also be colorless.
In terms of physical properties, vrbaite is relatively soft, with a Mohs hardness of 3 to 4, making it susceptible to scratching. It has a monoclinic crystal system and displays perfect cleavage in one direction, with a brittle fracture. Vrbaite is also known for its high density, with a specific gravity ranging from 2.77 to 2.98.
Due to its rarity and limited occurrence, vrbaite is primarily sought after by collectors and mineral enthusiasts. It serves as an excellent addition to mineral collections, particularly due to its distinctive color range and crystal formations. However, as vrbaite is not commercially significant for any specific industry, it does not hold great economic value outside of the collecting world.