muscovite muscovy glass from Little Scatwell, Ross & Cromarty, Scotland


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muscovite muscovy glass specimen from Little Scatwell, Ross & Cromarty, Scotland

Mineral Group  silicate
Composition  KAl3Si3O10(OH,F)2
Origin  Little Scatwell, Ross & Cromarty, Scotland
dimension (cm)  13x9x3
weight (g)  314
Muscovite (also known as common mica, isinglass, or potash mica is a phyllosilicate mineral of aluminium and potassium with formula KAl2(AlSi3O10)(F,OH)2, or (KF)2(Al2O3)3(SiO2)6(H2O). It has a highly perfect basal cleavage yielding remarkably thin laminae (sheets)
The name muscovite comes from Muscovy-glass, a name given to the mineral in Elizabethan England due to its use in medieval Russia as a cheaper alternative to glass in windows. This usage became widely known in England during the sixteenth century with its first mention appearing in letters by George Turberville, the secretary of England’s ambassador to the Russian tsar Ivan the Terrible, in 1568.
This cleavage of common material allows it to be split easily into thin, flexible sheets.
During World War Two  one of the main areas were identified which included mica deposit was at Little Scatwell, west of Inverness.  Mica ‘books’ were extracted and sent for processing in a sorting factory at Pitlochry.
It was used extensively in the electrical industry and for radio parts.

Additional information

Weight 314 g
Dimensions 13 x 9 x 3 cm