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Scientifical:
Aquamarine is pastel blue, greenish blue, or green-blue. The preferred aquamarine color is a dark blue to slightly greenish blue with moderate intensity and is most striking in gems of over 5-cts. Fine stones show even blue color with no zoning.
Fine aquamarines are a marriage between color and clarity. The best are dark blue to slightly greenish blue with no visible inclusions. Careful cutting maximizes both qualities to produce superb gems.
Feldspar is the name given to a group of minerals distinguished by the presence of alumina and silica (SiO2) in their chemistry. This group includes aluminum silicates of soda, potassium, or lime. It is the single most abundant mineral group on Earth. They account for an estimated 60% of exposed rocks, as well as soils, clays, and other unconsolidated sediments, and are principal components in rock classification schemes. The minerals included in this group are the orthoclase, microcline and plagioclase feldspars.

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