1) Quartz 2) Smoky quartz 
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yellow-brown quartz
A yellowish-brown to smoky yellow variety of quartz. The most important stone in Scottish jewellery. Originally discovered in the Cairngorm mountains, and much simulated in glass (detectable by gas bubbles), and now imitated by applying heat treatment to Brazilian amethysts.
Yellowish-brown to smoky yellow variety of quartz. It is the most important stone in Scottish jewellery. The stones were originally found in the Cairngorm mountains, and have been much simulated in glass (detectable by gas bubbles), and are now usually imitated by applying heat treatment to Brazilian amethysts.
[n] - a smoky yellow or brown quartz
smoky quartz noun a smoky yellow or brown quartz