porphyry

How To Use porphyry In A Sentence

• Red Rivers, which are tinged with red mud, derived from rocks of porphyry and red gypseous clays in 'the far west.' The Harvard Classics Volume 38 Scientific Papers (Physiology, Medicine, Surgery, Geology)
• This rare work of porphyry, limestone, serpentine and onyx is unique north of the Alps.
• This is particularly well known to collectors familiar with porphyry copper deposits of Arizona, New Mexico, and Utah.
• It is scarcely more previous than the underlying limestones, and why a solution that could penetrate and leach ores from it should be stopped at the upper surface of the blue limestone is not obvious; nor why the plane of junction between the porphyry and the _blue limestone_ should be the special place of deposit of the ore. Scientific American Supplement, No. 446, July 19, 1884
• The so-called porphyry copper mines, which now produce more than half the world's copper, are worth looking at in the context of exploitation limits. Limits to Exploitation of Nonrenewable Resources (historical)
• p 239 active volcanoes is always manifested in the chain of the Andes by the appearance of certain rocks (as dolerite, melaphyre, trachyte, andesite, and dioritic porphyry), which divide the so-called primitive rocks, the transition slates and sandstones, and the stratified formations. the constant recurrence of this phenomenon convinced me long since that these sporadic rocks were the seat of volcanic phenomena, and were connected with volcanic eruptions. COSMOS: A Sketch of the Physical Description of the Universe, Vol. 1
• For Sorabji his financial gain was the continuation of his municipal salary, so that he could keep his school open, rather than a craven payment for services rendered to the Christian authorities; he did not betray his friends; he did not betray philosophy, since he merely preferred the teaching of Porphyry in the matter of divine names and theurgy to that of Iamblichus and Proclus. The Garbage House
• Instead of agreeing with Iamblichus 'insistence on theurgy as indispensable to reaching spiritual union with God, a doctrine largely taken over by Proclus, Ammonius harmonized Aristotle with Plato by siding with Porphyry's (232-309) view that names were imposed by humans and, Sorabji suggests, he also agreed with Porphyry's refusal to accept the efficacy of theurgy in purifying the intellect and hence leading us to God. The Garbage House
• The 126 bandwidth hyperspectral survey data provides far superior resolution than space borne platforms such as ASTER and has the ability to identify the specific hydrothermal alteration minerals (such as dickite and alunite) that are commonly associated with epithermal and porphyry related deposits. Marketwire - Breaking News Releases
• Most beautiful marble of various colours is to be found, and also enormous quantities of mica and amianth; porphyry and porphyroid granite, carbonated and hydroxided iron, argillaceous schist, mica schist. Across Unknown South America