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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“Trust in the LORD with all your heart and lean not on your own understanding; in all your ways submit to him, and he will make your paths straight.”
– Proverbs 3:5-6