More mica stuff:
The general formula for mica is AB2-3 (Al, Si)Si3 O10 (F, OH)2. In most micas the A is usually potassium, K, but can be calcium, Ca, or sodium, Na, or barium, Ba, or some other elements in the rarer micas. The B in most micas can be aluminum, Al, and/or lithium, Li, and/or iron, Fe, and/or magnesium, Mg. The mica group is a large group with nearly 30 members recognized, but only a few are common. Those few however make up a large percentage of the most common rock types found in the Earth's crust. The following are some of the more common mica minerals:
•Biotite •Fuchsite •Lepidolite •Muscovite •Phlogopite •Zinnwaldite
CH
ps - geez, I wonder if there is any aluminum, lithium, magnesium
or other minerals present in our mica mine that may
be of additional value? |
