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Flint (Crypto-crystalline variety)

a crypto-crystalline variety of quartz. It is usually gray, smokebrown, or brownish black. If derived, as it mostly is, from the cretaceous forma- FLINT tion, the white of the chalk is still seen on its external surface. Luster subvitreous; fracture conchoidal, leaving a cutting edge. Most of the flints scattered on the surface of the ground or existing in Tertiary or more recent sedimentary deposits came originally from the cretaceous rocks, one division of which is termed Upper White Chalk with flints, this being distinguished from the Lower ite Chalk without flints. Next to the White sedimentary rocks. The organic portion chalk with flints constitutes the highest or newest layer yet discovered of the sedimentary rocks. The organic portion of flint pebbles consists of diatoms, seaweeds of low organization, the minute infusorial animals called polycistina, the of flint in potassic hydrate. To skin a and chalk. Liquor of flints, a solution etc. They are the same as those in agate flint, to descend to any false economy or and chalk. Liquor of flints , a solution money. meanness to make a trifling sum of flint, to descend to any false economy or meanness to make a trifling sum of money.

DR. SIMON FLEXNER