Labradorite. A kind of feldspar, commonly showing a beautiful play of bluish-gray colors, and, hence, much used for ornamental purposes. The finest specimens come from Labrador.

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“Let us urge forward our spirits, and make them approach the invisible world, and fix our mind upon immaterial things, till we clearly perceive that these are no dreams; nay, that all things are dreams and shadows besides them.”
–Henry Scougal, The Life of God in the Soul of Man