The formation of the hydrate from this mineral and from monocalcium aluminate represents the first stage of strength development in aluminous cements.
12.
It occurs in association with crandallite and variscite in fractures in aluminous metamorphic rock, in hydrothermal regions and in phosphate rock deposits.
13.
The reaction is quenched with water, creating large volumes of corrosive aluminous, acidic waste-3 mol HCl per mol AlCl 3.
14.
Because of its higher reactivity, leading to excessively rapid hydration, aluminous cements contain relatively low amounts of dodecacalcium hepta-aluminate, or none at all.
15.
The mare material, which make up the floor of the mare, is a high aluminous basalt, and consists of Upper Imbrian basalt covered by Eratosthenian basalt.
16.
The cumulate rock is a plagioclase-pyroxene cumulate ( a gabbro ) and the melt is now more felsic and aluminous in composition ( trending towards andesite compositions ).
17.
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.
18.
An abundant resource is one whose material has so far found little use, such as using high-aluminous clays or anorthosite to produce alumina, and magnesium before it was recovered from seawater.
19.
In peridotite, plagioclase is stable at relatively low pressures ( crustal depths ), aluminous spinel at higher pressures ( to depths of 60 km or so ), and garnet at yet higher pressures.
20.
In the Barrovian sequence ( described by George Barrow in zones of progressive metamorphism in Scotland ), metamorphic grades are also classified by mineral assemblage based on the appearance of key minerals in rocks of pelitic ( shaly, aluminous ) origin:
