Significats de schorl en anglès

We found in it a group of fine crystals of black schorl.

I observed neither hornblende, black schorl, nor rutile titanite, in this granite.

Sometimes the red schorl occurs only in dendritic crystals of a bright red.

In another place, I found crystals of black schorl radiating from a common centre.

Roche hermitage in Cornwall occupies a spire of rocks of schorl that shoots 100 feet above the surrounding moor.

If the stuff does not answer the magnet, it is probably schorl (tourmaline), hornblende, or dark quartz.

The feldspar and the mica, for example, as well as the schorl, are found variously coloured in different granites, and coloured in various proportions.

Both specimens immediately succeed the Schorl rock at the Cataract, in large smooth-sided masses.

Schorl Rock.-Colourblueish grey, fine grained, extremely hard.

"Molybdenite, kaolin, tremolite, schorl, adularia, garnet, actinolite, precious serpentine (remarkably elegant), epidote and diallage."