October birthstone: Colorful opal and tourmaline
Take your pick: the October birthstone is either the striking iridescent opal or the many-colored tourmaline. Learn the lore of these pretty gemstones here. The post October birthstone: Colorful opal and tourmaline first appeared on EarthSky .
Tourmaline is the alternative October birthstone to opal. This colorful gemstone comes in a wide range of hues, from vibrant greens and blues to vivid pinks and reds. Its name comes from the Tamil word "turam," meaning colorful. Tourmaline forms in a variety of geological environments, such as granite pegmatites and metamorphic rocks. It is often found alongside opal and other gemstones.
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