copper pyrites
Americannoun
noun
Etymology
Origin of copper pyrites
First recorded in 1770–80
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
About Mambulao cupro-ferruginous quartz and copper pyrites are found, but are not worked.
From The Inhabitants of the Philippines by Frederic H. Sawyer
Chili, copper pyrites with gold in. —, walls cracked by earthquake in.
From The Student's Elements of Geology by Sir Charles Lyell
It is also an important circumstance that near the point of contact, both the granite and the secondary rocks become metalliferous, and contain nests and small veins of blende, galena, iron, and copper pyrites.
From The Student's Elements of Geology by Sir Charles Lyell
Similarly the yield with copper pyrites would be 7.5 or 11.6; with blende, 6.4 or 8.5; with antimonite, 5.5 or 8; and with galena, 2.6 or 3.4.
From A Text-book of Assaying: For the Use of Those Connected with Mines. by Cornelius Beringer
In one case, where the fissure is partially filled up with silica inclosing iron and copper pyrites, gold has also been found in the vein-stone.
From The Student's Elements of Geology by Sir Charles Lyell
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