I enjoyed studying geology at university, especially the field trips with a hammer in my hand. To find a rock like this would have made my day.
|Jersey - 23 January 2007|
This shows muscovite in a pegatite vein, felspar and mica.
Muscovite, aka common mica, isinglass or potash mica is a hydrated silicate of aluminium and potassium. Cleavage can give thin laminae sheets. Pegmatite is an igneous rock composed of quartz, felspar and mica.
For more geological samples check dig out the link at Treasures. where you may find an old fossil like me.