Slow cooling allots the calcium the necessary time to separate itself from the structure to form exsolution lamellae of calcic clinopyroxene, leaving no pigeonite present.
12.
Conversely, these fluids may metasomatically alter a rock, introducing new Rb and Sr into the rock ( generally during potassic alteration or calcic ( albitisation ) alteration.
13.
In the feldspars the center is usually richer in calcium than the surrounding layers, and successive zones may often be noted, each less calcic than those within it.
14.
For this process to operate it is important that Ca is sufficiently present so that a fairly calcic plagioclase can be formed which in turn releases enough silica for the myrmekite vermicules.
15.
At significantly shallower depths, above the Moho, calcic plagioclase is the more stable aluminous mineral in peridotite while garnet is the stable phase deeper in the mantle below the spinel stability region.
16.
Alteration is a mixture of sodic-calcic ( albite-epidote ) to potassic ( K-feldspar ) in style, and may vary from province to province based on host rocks and mineralising processes.
17.
Motukoreaite has been found in association with apatite, barite, calcite, chabazite, calcic plagioclase, gismondine, gypsum, hisingerite, hydrotalcite, limonite, magnetite, montmorillonite, nordstrandite, olivine, phillipsite, pyroxene, quartz, and zeolites.
18.
These outstanding Roman cements are based on the calcic activation of ceramic aggregates ( in Latin " testa ", analogue to our modern metakaolin MK-750 ) and alkali rich volcanic tuffs ( cretoni, zeolitic pozzolan ), respectively with lime.
19.
The " ferroan anorthosite suite " consists almost exclusively of the rock " anorthosite " ( > 90 % calcic plagioclase ) with less common " anorthositic gabbro " ( 70-80 % calcic plagioclase, with minor pyroxene ).
20.
The " ferroan anorthosite suite " consists almost exclusively of the rock " anorthosite " ( > 90 % calcic plagioclase ) with less common " anorthositic gabbro " ( 70-80 % calcic plagioclase, with minor pyroxene ).
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