Precious and Semiprecious Gems. For centuries, people have used the terms precious and semiprecious to describe gemstones. You'll still occasionally hear these terms today..Aquamarine is a member of the beryl family and is colored by traces of iron. Its color can range from blue to bluish-green and is typi.y very subtle, especially when compared to more vivid and intensely colored blue gemstones such as blue topaz..
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Kyanite is a typi.y blue aluminosilicate mineral, commonly found in aluminium-rich metamorphic pegma.es and/or sedimentary rock.Kyanite in metamorphic rocks generally indicates pressures higher than four kilobars.Although potentially stable at lower pressure and low temperature, the activity of water is usually high enough under such conditions that it is replaced by hydrous .
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Chapter 3 - Minerals : The science of geology is founded on basic principles that are useful for making observations about the world around us. Everything around us is made of chemical compounds that have testable and indentifying characteristics, allowing them to be cl.ified..