from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A silvery white or pale green aluminum silicate mineral, Al2Si4O10(OH)2, occurring naturally in soft compact masses.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A soft, pale aluminosilicate mineral, somewhat resembling talc.
from the GNU version of the Collaborative International Dictionary of English
- n. A mineral, usually of a white or greenish color and pearly luster, consisting chiefly of the hydrous silicate of alumina.
from The Century Dictionary and Cyclopedia
- n. A hydrated aluminium silicate, occurring in foliated talc-like subtransparent masses having a white, green, or yellow color and pearly luster.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a white or greenish aluminum silicate mineral (resembles talc)
Sorry, no etymologies found.
The name pyrophyllite comes from the Greek words pyr meaning fire and phyllon meaning leaf, a reference to the fact that it flakes when heated.
Minerals that could be used to replace feldspar include pyrophyllite, clays, talc, and feldspar-silica (quartz) mixtures.
Despite the volume of talc/pyrophyllite produced domestically, some is imported from China, Canada, Japan, and other countries.
All the pyrophyllite produced in the United States is mined in North Carolina.
The United States produces enough talc and pyrophyllite to meet its annual needs.
The available reserves of talc are sufficient for many decades to come so such substitutions are not necessary, though they may be cost-effective depending on the relative costs of talc, mica, pyrophyllite and kaolin.
Two different minerals with similar physical properties are talc and pyrophyllite.
Chinese “soapstone” carvings are carved from fine-grained pyrophyllite.
There are numerous talc and pyrophyllite resources worldwide.
Both are very soft: talc is the softest mineral on the Mohs 'hardness scale at 1, and pyrophyllite is 1 to 2.