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I found this on my trip to Topaz mountain while filming my YouTube channel Mining America. You can trust the source and watch me find the minerals.

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Topaz is a semiprecious gemstone that occurs as very hard, transparent crystals in a variety of colors. Topaz crystals, such as those found at Topaz Mountain, are naturally amber colored, but become colorless after exposure to sunlight. Topaz forms within cavities of the volcanic rock, rhyolite, from eruptions that occurred six to seven million years ago during the Tertiary Period. Topaz is embedded in the rhyolite rock, and also found loose on the slopes and arroyos.

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