- nailhead spar
- noun
: calcite that crystallizes in nail-headed forms
Useful english dictionary. 2012.
nailhead spar
Look at other dictionaries:
Calcite — A one inch Calcite Rhomb that shows the Double image refraction property. General Category Carbonate mineral … Wikipedia
Jewel Cave National Monument — National monument, southwestern South Dakota, U.S. Established in 1908, it occupies an area of 2 sq mi (5 sq km). It is noted for its limestone caverns, a series of chambers joined by narrow passages. The known length of the caverns is 77 mi (124 … Universalium
