Mag
2004-09-23, 09:13 PM
B-b-b-b-bill Nye The Science Guy...
Cummingtonite is the name of a series as well as the name of a mineral. The mineral cummingtonite, is basically the middle member of the Cummingtonite Series, which include the minerals grunerite and magnesiocummingtonite. All three minerals' formulae are essentially the same: (Mg, Fe)7Si8O22(OH)2. However the percentage of magnesium to iron varies in the series and determines the mineral whereas, little else does. In grunerite, the iron rich member, the ratio of Mg/(Mg +Fe) equals 0.00 to 0.29; but in magnesiocummingtonite, as the name implies it is magnesium rich, the ratio equals 0.70 to 1.00. Cummingtonite by default has a ratio of 0.30 to 0.69, the majority of the middle and as can be expected is the most common member of the series.
http://mineral.galleries.com/minerals/silicate/cummingt/cummingt.htm
And it's still being discovered by pre-teens everywhere...
Discovered by Dhark.
Cummingtonite is the name of a series as well as the name of a mineral. The mineral cummingtonite, is basically the middle member of the Cummingtonite Series, which include the minerals grunerite and magnesiocummingtonite. All three minerals' formulae are essentially the same: (Mg, Fe)7Si8O22(OH)2. However the percentage of magnesium to iron varies in the series and determines the mineral whereas, little else does. In grunerite, the iron rich member, the ratio of Mg/(Mg +Fe) equals 0.00 to 0.29; but in magnesiocummingtonite, as the name implies it is magnesium rich, the ratio equals 0.70 to 1.00. Cummingtonite by default has a ratio of 0.30 to 0.69, the majority of the middle and as can be expected is the most common member of the series.
http://mineral.galleries.com/minerals/silicate/cummingt/cummingt.htm
And it's still being discovered by pre-teens everywhere...
Discovered by Dhark.