Manufacturer and builder 2, 1880
The same correspondent makes the above inquiry. In replying, we beg to inform him that the question is altogether too vague to enable us to answer properly. There is a good demand for clear mica in merchantable sizes, and if our inquirer owns or controls a deposit that will yield this article, he has a very good prospect of realizing hand-somely from it. The mica, to be merchantable, must he clear and transparent, free from markings or stains of iron and other impurities, and in plates not less than 8 or 4 inches square. The clearer the stuff and the larger use sheets the more valueble it is. From these general points our inquirer may judge if his particular deposit fills the bill.
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