gehlenite


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gehlenite

(ˈɡeɪləˌnaɪt)
n
(Minerals) a green mineral consisting of calcium aluminium silicate in tetragonal crystalline form. Formula: Ca2Al2SiO7
[named after A. F. Gehlen (1775–1815), German chemist; see -ite1]
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References in periodicals archive ?
The analysis showed that the composition of the original ash sample included mainly quartz, lime, anhydrite, calcite and smaller amounts of orthoclase, periclase, gehlenite, larnite, merwinite, pseudowollastonite, hematite, ettringite, melilite and dolomite (Table 2).
The main crystallographic phases in the fly ash pattern are quartz (d = 3.34 [Angstrom]), cristobalite (d = 4.04 [Angstrom]), feldspars (d = 3.19 [Angstrom]), gehlenite (d = 2.85 [Angstrom]), maghemite (d = 2.52 [Angstrom]), and anhydrite (d = 3.49 [Angstrom]).
Ma, "Ca 2+ and OH--release of ceramsites containing anorthite and gehlenite prepared from waste lime mud," Journal of Environmental Sciences, vol.
Above 850[degrees]C, the decomposition of calcite can give rise to high-temperature calcosilicates and alumino-calcosilicates, member of the pyroxene group, such as the diopside, plagioclase feldspars (anorthite), gehlenite and wollastonite (Papachristodoulou et al.
A range of products is formed, including CSH, [C.sub.2]AS[H.sub.8] (gehlenite hydrate) and hydrated calcium aluminates, [C.sub.4]A[H.sub.13] and [C.sub.3]A[H.sub.6] [21, 22, 23].
Slag consists of calcium magnesium silicate (akermanite) and calcium aluminium silicate (gehlenite) (Li and Gilkes 2002).
The following standards were used: sanidine (K K[alpha]), cuprite (Cu K[alpha]), diopside (Ca K[alpha]), nichromite (Ni K[alpha]), zincite (Zn K[alpha]), synthetic [Cd.sub.5][([PO.sub.4].sub.3](OH) (Cd L[alpha]), gehlenite (Al K[alpha]), synthetic V[P.sub.2][O.sub.7] (V K[alpha]), apatite (P K[alpha]) and phlogopite (F K[alpha]).
It shows the existence of a large peak in the 29 range of 20-38[degrees] and a very small amount of the gehlenite phase without any distinct crystalline peaks.