Quartz from Tibet - pic courtesy of Wikipedia
Quartz is the second most abundant mineral in Earth’s
continental crust, behind feldspar.
There are many different varieties of quartz, several of which are semi-precious
gemstones. Since antiquity, varieties of
quartz have been the most commonly used minerals for making jewelry and
carvings.
Pure quartz is colorless and transparent. The other colors of quartz are mixed with
other minerals. This colored quartz are
semi-precious stones for making jewelry and other decorative pieces.
Amethyst - pic courtesy of Wikipedia
There are many varieties of these, but I’ll just mention a
few. Purple quartz is amethyst. The largest deposit is found in Brazil. Amethyst is formed when there is iron in the area.
Citrine - pic courtesy of Wikipedia
Citrine is a variety of quartz that ranges from pale yellow to brown due to the ferric impurities. Natural citrines are rare. Most commercial citrines are heat-treated
amethyst, or smoky quartz's. Brazil is
the leading producer of citrine. Citrine
has been referred to as “money stone” due to the superstition that it would
bring prosperity.
Rose Quartz - pic courtesy of Wikipedia
Rose quartz is pale pink to rose red in color. This is due to trace amounts of titanium,
iron, or manganese.
A quartz crystal jug from the 16th century. This piece is in the National Museum in Warsaw.
Pic courtesy of Wikipedia
Quartz is very common in sedimentary rocks, such as sandstone
and shale. Quartz is a defining essential
of granite.
Almost all of the quartz crystals used today in the
electronics industry are synthetic.
This has been an interesting series!
ReplyDeleteJohn,
DeleteI'm glad you've enjoyed it. I wasn't going to participate in the challenge this year due to my schedule. I didn't know if I'd have time. Then I couldn't pass it up at the last minute, so I'm doing the minerals and gemstones because I'm a bit familiar with that and probably no one else is posting about that subject. I'm still way behind in reading blogs. That's troublesome, but I'm trying to catch up.
Sunni
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