from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A basic rock whose pockmarked appearance is caused by the presence of numerous white, rounded, embedded spherules.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A kind of diorite or diabase with embedded whitish spherules, which give the rock a spotted appearance.
from the GNU version of the Collaborative International Dictionary of English
- n. A kind of diorite or diabase containing imbedded whitish spherules, which give the rock a spotted appearance.
from The Century Dictionary and Cyclopedia
- n. A rock in which there is a more or less distinctly concretionary arrangement, giving rise to pustular or pea-like forms which are disseminated through a finely crystalline ground-mass, and which, from their resemblance as seen on weathered surfaces to smallpox-pustules, have for hundreds of years made this rock an object of curiosity.
In the Little Crau, the mouth of the Durance, are found prodigious numbers of green and crystalline rocks, granite and variolite brought down from the Alps of Briançon, but nine-tenths of the pebbles of the Great Crau are white quartz brought from the great chain of the Alps, together with mica-slate and calcareous stones, and only a few of the variolites of Mont Genèvre.