Diamond
The
diamond mineral is a highly unique mineral for many reasons. First of all, it
is the greatest conductor of heat among minerals. At room temperature, it feels
cold to the touch, and it retains heat for long periods of time. It is also the
hardest known substance and has the highest melting point of any substance. Due
to its strength and luster, diamonds are mostly used in the jewelry market. Diamonds
are also used in diamond saws, thermal insulators, optics, and electronics.
They can be colorless, white yellow, brown, gray, or black. Diamonds have an
isometric crystal structure and form in plutonic rocks deep underground.
Garnet
The
garnet mineral is not a single mineral, but rather a group of minerals that
vary slightly from one another in physical properties and characteristics. The
garnet minerals can be divided into two subgroups: garnets containing aluminum
as their second element and garnets containing calcium as their first element.
Garnet can be red, brown, black, green, yellow, orange, pink, white, and colorless.
It is brittle in tenacity, has an isometric crystal structure, and can form in igneous,
sedimentary, or metamorphic rocks. Garnet is commonly used in jewelry, especially
in its dark red form, and is very popular among mineral collectors.
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