What is Isinglass?

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More properly known as muscovite, isinglass is a form of mica that is often found in sheets. The sheets tend to be very thin and somewhat elastic in nature. Russia and India have been the site of mining sheets of mica on an ongoing basis. Isinglass is a mineral that can be found in a number of different natural formations, including granites and gneisses. The designation of muscovite for isinglass originates from the common usage of the mineral in the country of Russia. Around the city of Moscow, isinglass is often used for window glass. The particular formula that is used to create these clear and tinted panes of glass is known as Muscovy-glass. Isinglass is understood to form through a process that over time involves the natural alteration of various minerals until the result is the thin layers that can be mined and used for several different product types. Such minerals as kyanite, feldspar and topaz are often cited as building blocks for the creation of isinglass. Once the ... more
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