n. A translucent form of feldspar having flakes of hematite, used as an ornamental stone.
the GNU version of the Collaborative International Dictionary of English
n. Aventurine feldspar. See under aventurine.
The Century Dictionary and Cyclopedia
n. A variety either of oligoclase or of orthoclase, or when green a microcline feldspar, showing red or golden-yellow colored reflections produced by included minute crystals of mica, göthite, or hematite.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a translucent quartz spangled with bits of mica or other minerals
Word Usage
"Such a tool, known as a sunstone, is known from legend, but until now experimental evidence that it could actually work as hypothesized was lacking."