Topaz. A mineral occurring in rhombic prisms, generally yellowish and pellucid, also colorless, and of greenish, bluish, or brownish shades. It sometimes occurs massive and opaque. It is fluosilicate of aluminum, and is used as a gem. It is but little more valuable than the garnet, except occasionally unusual fine specimens.

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“Christ's ... yoke is an easy yoke; his burden like the burden of wings to a bird, that makes her fly the higher.”
–Richard Sibbes, The Bruised Reed and Smoking Flax