ozocerite

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A yellow-brown to black or green hydrocarbon wax, found in irregular veins in sandstones and used in making electrical insulation and polishes.

from The Century Dictionary.

• noun A mixture of natural paraffins existing in the bituminous sandstones of coal-measures.
• To treat with ozocerite or native paraffin.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Min.) A waxlike mineral resin; -- sometimes called native paraffin, and mineral wax.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun mineralogy A dark waxy mineral, found associated with petroleum in some sandstones, used to make polishes.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a waxy mineral that is a mixture of hydrocarbons and occurs in association with petroleum; some varieties are used in making ceresin and candles