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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“I have told you these things, so that in me you may have peace. In this world you will have trouble. But take heart! I have overcome the world.”
– Jesus, John 16:33