The Collaborative International Dictionary
Cairngormstone
cairngorm \cairngorm\, Cairngormstone \Cairn*gorm"stone`\ [Gael. carn a cairn + gorm azure.] (Min.) A smoky yellow or brown variety of rock crystal, or crystallized quartz, found especially, in the mountain of Cairngorm, in Scotland.
Syn: smoky quartz.
Wiktionary
cairngormstone
n. (context mineral rare English) A yellow or smoky brown variety of rock crystal, found especially in the mountains of (w: Cairngorm) in Scotland.