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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“A gracious heart is contented by the melting of his will and desires into God's will and desires.”
–Jeremiah Burroughs, The Rare Jewel of Christian Contentment