Petrographi-cally, both series are characterized by three generations of feldspar, all rock types containing labradorite together with more sodic phenocrysts and groundmass plagioclase: orthopyroxene, ...

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The intermittence of solar energy resource in concentrated solar power (CSP) generation and solar drying applications can be mitigated by employing thermal energy storage materials. Natural rocks are ...

Unique features Very large minerals – in igneous rocks, the term "coarse-grained" means the minerals are large enough to be seen with the naked eye. In a pegmatite like this, the minerals are much ...

The Morro Redondo Complex is one of the most important occurrences of the Graciosa A-type Province, southern Brazil. It consists of the Papanduva and Quiriri granitic plutons and a contemporaneous ...

the median intermediate zone is formed by quartz, K-feldspar, muscovite, albite, lepidolite, black tourmaline (dravite) and occasional grains of gemologic minerals like spessartine, gahnite, rose ...