Sentence examples for dark silicate from inspiring English sources

If both oligoclase and alkali feldspar are prominent among the phenocrysts, the dominant dark silicate will be biotite, and neither amphibole nor pyroxene, if present, will be of an alkaline variety; such lavas are the quartz porphyries or "true" rhyolites of most classifications.

The 1997 Pillan eruption produced a wide deposit of dark, silicate material and bright sulfur dioxide.

Smalt is produced by melting a mixture of the roasted mineral smaltite, quartz and potassium carbonate, yielding a dark blue silicate glass which is ground after the production.

The specific gravities of silica minerals are less than those of most of the dark-coloured silicate minerals associated with them in nature; in general, the lighter-coloured rocks have lower specific gravity for this reason.

The dark lines (stacked silicate platelets) denote clay tactoids, and the rest of the area represents organic matrix.

The silicate dark lines have variable thickness due to stack of platelets one above each other and even high level of stacking occurred in the 20 wt% clay content.

TEM analysis showed that the small dark rectangular particles were silicate impurities.

Or, as they will report later this week at the Extreme Solar Systems II conference in Jackson Lake, Wyoming, it's possible that bright spots represent brief glimpses of deep, hot layers of atmosphere through dark clouds composed of silicate and metallic dust grains.

This PTS (0.9 × 0.8 cm in size) consists of dark fine-grained mafic silicates (Figure 1c).

The matrix of the crystal beds is composed of very fine clay-sized silicate particles, recognized as dark areas on photomicrographs.

Lapis lazuli, a rare dark blue mineral (the compound sodium aluminum silicate containing sulfur), has been widely used as a semiprecious stone throughout history.