Tourmaline. A mineral occurring in three-sided prisms. Black tourmaline is the most common variety, but there are also other varieties, as the blue (indicolite) red (rubellite); also green, brown and white. The red and green varieties, when transparent, are valued as jewels. The finest ones come from Maine, and are worth four or five times as much as garnets.

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“Satan will object, Thou art a great sinner. We may answer, Christ is a strong saviour.”
–Richard Sibbes, The Bruised Reed and Smoking Flax