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Apatite, sphene, and magnetite are abundant. As originally described, the rocks
are ordinarily far richer in dark silicates and often far poorer in quartz than granite
. Tonalites are of worldwide occurrence; excellent examples are known from ...
... Index: carnotite; descloizite; tyuyamunite; vanadinite vanadinite, vanadium
mineral in the pyromorphite series of the apatite group of phosphates, lead
chlorovanadate, Pbs(VO4)3Cl, which is a source of vanadium and a minor
source of lead.
It also occurs with apatite on islands where phosphatic solutions from guano (
seafowl excrement) have altered aluminous igneous rocks. Strengite deposits
are known in Germany, Portugal, Sweden, and the U.S. For detailed physical ...
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review