Melilite refers to a mineral of the melilite group. Minerals of the group are solid solutions of several endmembers, the most important of which are gehlenite and åkermanite. A generalized formula for common melilite is (Ca, Na) 2 (Al, Mg, Fe 2+) [ (Al, Si) Si O 7]. Discovered in 1793 near Rome, it has a yellowish, greenish-brown color.

In petrology "melilite" usually refers to minerals in the åkermanite-gehlenite series, by far the most abundant members of the group. A large number of synthetic members are known.

Melilite, any member of a series of sorosilicate minerals that consist of calcium silicates of aluminum and magnesium. Melilites were first described in 1796 and range in color from white and yellow to brown, gray, and greenish gray.

Melilite was originally described in 1796 from Capo di Bove, Alban Hills, Rome Province, Latium, Italy. The name refers to a group of minerals (melilite group) with chemically similar composition, nearly always minerals in åkermanite - gehlenite series.

Melilite is defined as a group of minerals with a chemical composition represented by various formulas, such as Ca2(Al,Mg,Fe3+)(Al,Si)(Si,Al)O7. These minerals are challenging to identify within slag matrices and can be easily confused with other species. AI generated definition based on: Coal and Peat Fires: A Global Perspective, 2019

Melilite. Comments: Barrel-shaped root-beer colored melilite crystal with clear nepheline. Location: Udersdorf, Rhineland-Palatinate, Germany. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals

Melilite is an intermediate term between gehlenite and akermanite, now individualized as a mineral in its own right. This calcium silicate is found in certain ultrabasic rocks and undersaturated alkaline rocks, in potassic lavas with leucite and olivine, sometimes leading to melilitites, in skarns in contact with limestones and dolomites.

Melilitite is a volcanic rock composed of over 90% melilite, with small amounts of olivine, clinopyroxene, and perovskite.

2022年2月3日 · The melilites are a group of little-known silicate minerals. In nature, the commonest are rock-forming minerals found in the igneous rocks characterized by a low silica content (undersaturated rocks), in contact metamorphic rocks formed where igneous rocks invade impure limestones.

The general formula for the melilite group is A 2 B(T 2 O 7), where, in common melilites, A is calcium, B is Mg, Fe or Al and T is Si, although many other elements may be involved. The structure of melilites is based on the unit Si 2 O 7 6−, making a dimer with a bow-tie-shaped configuration (Fig. 1). In the mineral åkermanite, (Ca 2 MgSi 2 O 7