Feldspar in sentence

3 examples of Feldspar in a sentence

These are quartz crystals and feldspar, so most sand in the world on the mainland is made of quartz crystal and feldspar.

It was made of black, glassy lava mixed with bits of feldspar.

The walls assumed a crystallised though sombre appearance; mica was more closely mingled with the feldspar and quartz to form the proper rocky foundations of the earth, which bears without distortion or crushing the weight of the four terrestrial systems.

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