Trap rock

Mixed with trap rock and asphalt flux to obtain mix for cold rolling as pavement surfacing. 

Tuffwaeke,/. decomposed trap (rock). Tugend,/. virtue, tugendhaft, a. virtuous. 

There arc many localities for apophyllite Bohemia, Trcnfino, Italy, the Hartz Mountains, and Iceland, Fine specimens have been obtained from the Ghats Mountains in India. The Triassic trap rocks of New Jersey, Connecticut, and Nova Scotia have also furnished many specimens. 

Native copper commonly occurs in the oxidized /ones of copper deposits in association with cuprite, malachite, and a/urite. The native copper deposits on Ihe Michigan Kceweenau Peninsula represent an exceptional occurrence, The copper occurs there as veins within igneous trap rocks inierhcddeJ Willi conglomerates. Sec also Copper... 

Trap rocks (basalts) are products of volcanic action, either us extensive lavu Hows, or as intrusive dikes in preexisting rocks. Secondary mineralization within such rocks from circulating waters produces interesting suites of /oolitic minerals, such as analcime, heulaiulite. ralrolite. stilbite. inesoliie. and tubers. 

For about two hundred years, zeolites were considered minerals of no practical interest, because of their exiguity in known occurrences in vugs and cavities of basalts (rocks with silica content ranging between 45% and 52%) and other trap-rock formations. However, the discovery of their unique and attractive properties useful for many applications of environmental and industrial relevance, promoted search campaigns to find more significant natural zeolite formations. Evidence for the existence of microcrystalline zeolite occurrences of volcanic origin had sporadically been reported in the literature (see, e.g., [17]), but nobody would have expected that so huge zeolite deposits would have been found in a few decades all over the world (see Sec. 4). 

Quarried, cmshed, sized from 0.95 cm to dust and fluxed with softer asphalt for use as cold-applied pavement surfacing. Mixed with trap rock and asphalt flux to obtain mix for cold rolling as pavement surfacing. 

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