Melilite - Wikipedia
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.
Melilite Group: Mineral information, data and localities. - mindat.org
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. As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
黄长岩类 - 百度百科
黄长岩类（melilitites)主要是由黄长石和辉石（有时包括钙钛矿）组成的超镁铁质火成岩，若为火山岩，称为黄长岩（melilitite)，若为含黄长石的侵入岩，称为黄长石岩（melilitolite)。 黄长岩类在自然界非常特殊而稀少，最著名的产地是意大利。 [1] 黄长石类的矿物种类较多，主要矿物为黄长石、橄榄石（体积分数小于10%）、辉石，似长石 (白榴石、霞石、钾霞石和方钠石族）和黑云母次之。 黄长石（melilite)是几个端元的固溶体矿物，主要包括 钙铝黄长石 和镁黄长石。 [2] 黄长 …
Melilite - an overview | ScienceDirect Topics
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 Mineral Data
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 | Properties & Facts | Britannica
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. The name derives from the Greek words for honey (meli) and stone (lithos).
Minerals explained 61: Melilites - Brooks - Wiley Online Library
2022年2月3日 · The melilite group of minerals is characterized by a double SiO 4 tetrahedron forming a bow tie-like unit. Melilites are not common in nature but are quite widespread, occurring in igneous rocks, contact metamorphic rocks and meteorites. Additionally, they are a feature of slags produced by industrial processes.
Melilite-group minerals at Oldoinyo Lengai, Tanzania
2010年7月1日 · Oldoinyo Lengai and the volcanic centres of the Lake Natron–Engaruka province contain melilite as a widespread mineral. Extraordinarily Na–Al-rich melilites (up to 6 wt.% Na 2 O and 9 wt.% Al 2 O 3) from recent explosive eruptions are among the most Na-rich ever reported.
Melilite-type and melilite-related compounds: structural …
2011年12月23日 · This introduction on melilite-type and melilite-related structures reveals that although in the last decades many studies were dedicated to assess the behavior of these compounds, especially to interpret and solve the IC phase transition, very little effort has been devoted (with the exception of Armbruster et al. 1990) to solve the dichotomy ...
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
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