Definitions for cairngormˈkɛərnˌgɔrm
Random House Webster's College Dictionary
Category: Mineralogy, Jewelry
Ref: smoky quartz.
Origin of cairngorm:
1785–95; short for Cairngorm stone, i.e., stone from Scottish mountain so named
cairngorm, smoky quartz(noun)
a smoky yellow or brown quartz
The Nuttall Encyclopedia
a yellowish-brown variety of rock-crystal, so called from being found, among other places, on one of the Scottish Grampians, in Aberdeenshire, so named.