Researchers has discovered a new mineral consisting of Aluminium, Oxygen and Calcium. It was discovered in a 4,5 billion year old meteorite, known as the "Broken Egg" meteorite

Krotite, CaAl₂O₄, occurs as the dominant phase in an unusual Ca-,Al-rich refractory inclusion from the NWA 1934 CV3 carbonaceous chondrite.

Krotite occupies the central and mantle portions of the inclusion along with minor perovskite, gehlenite, hercynite, and Cl-bearing mayenite, and trace hexamolybdenum. A layered rim surrounds the krotite-bearing regions, consisting from inside to outside of grossite, mixed hibonite, and spinel, then gehlenite with an outermost layer composed of Al-rich diopside.

The mean chemical composition is (wt%) Al₂O₃ 63.50, CaO 35.73, sum 99.23, with an empirical formula calculated on the basis of 4 O atoms of Ca_1.02Al_1.99O₄.

Krotite is colorless and all-most transparent -  colorless to very pale gray with a vitreous luster and white streak. The density is 2.94 g/cm^3. Analysis reveals that krotite is biaxial Pleochroism, monoclinic and has a stuffed tridymite structure 

Krotite is a low-pressure CaAl₂O₄ mineral, likely formed by condensation or crystallization from a melt in the solar nebula. This is the first reported occurrence of krotite in nature and it is one of the earliest minerals formed in the solar system.

Source: Geoscienceworld