Feature Post, Geology, Great Pics

The most beautiful types of quartz [w/ pics]

quartz-corchia2

Despite the fact that it’s the 2nd most common mineral in the Earth’s continental crust, quartz is a true wonder of nature. Composed of the two most common elements in our planet’s crust (oxygen and silicone), quartz fascinated both scientists and common people since ancient times. At a molecular level, it forms extremely complicated (and variable) crystals, so going into more details there would require a considerable amount of detail – entire books have been written on that sole subject.

quartz

Quartz in itself is colorless and transparent (or translucent), but more often than not, it has some impurities. It’s these impurities that make it even more beautiful to look at. In this post, I’ll be ignoring the more practical uses of this amazing mineral and focus on aesthetics of its natural varieties (I’ll comeback with the practical uses in a post a few days from now, but just so you get an idea, quartz is absolutely crucial to the computer industry).

Amethyst

amethyst2

Perhaps the most striking representative of the quartz ‘family’, amethyst has been known and admired since the dawn of civilization – there are references to ancient Greeks and Romans that believed it prevented you from getting drunk and intoxicated (they even made drinking vessels of it). Also, if you placed one in the middle of your crop, it would protect it from pests and locusts.

amethyst1

There is still some debate surrounding its chemistry; it has the SiO2 composition (as every quartz variety), but the impurities that give it it’s violet color are still a topic of discussion. The most plausible possibilities are ferric iron and an interplay of iron and aluminum.

amethyst3

Color can range from a light pinkish to a deep purple, and there is quite a lot of it around, especially in Brazil, where the biggest mines are (it’s also relatively abundant in South Korea and Austria).

amethyst-4

Chalcedony

chalcedon

Most types of quartz have macroscopic crystals, but this is where chalcedony is different. It’s a cryptocrystalline form (crystals are barely visible even with a microscope) generally referred to as microcrystalline quartz in geology; because it alone has numerous varieties, gem dealers refer to each one by its name. If you plan on getting one, be careful however: numerous sellers just dye the rock, and for the inexperienced eye that can be hard to tell, because it can have a wide range of colors. Chalcedony also often psuedomorphs after organic materials, resulting in petrified wood (in Arizona, a whole forest has been petrified in this way), coral, etc. Types of chalcedony:

Agate

agate1

agate2

agate3

agate5

agate6

Carnelian

carnelian_-_tumble_polished_stone

carnelian1

Heliotrope (bloodstone)

heliotrope

bloodstone

Citrine

citrine1

Citrine is the yellow variety of quartz (citrus means lemon in latin), and can be formed by two different mechanisms: the feric variety, with iron or iron oxide absorbs radiation (from ultraviolet to blue), and the second mechanism is still unclear, but it’s known that it’s caused by aluminum, lithium or hydrogen inclusions.

citrine-3

citrine2

Smoky quartz

smokyquartz

It’s easy to guess why the smoky quartz was given this name; the color ranges from brown to black, giving the vague impression that there’s smoke inside the mineral. It can be obtained either naturally or artificially.

smoky_quartz_2

It also has two varieties, morion and cairngorm.

Rose quartz

rose_quartz

Rose quartz varies color from light pink to rose red, usually due to titanium or iron (but manganese can also be present). It’s rarely used as a gem, because in the vast majority of the cases, it has a lot of impurities, which is why it’s mostly used to carve animals, hearts, etc.

rose-quartz-4

However, when clear, it’s quite lovely.

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rose_quartz2

You have to bear in mind that this is merely a visual separation of the types of quartz and I’ll ask you to excuse me for not using geological criteria that are more relevant; my goal was to show how unbelievably variate a single mineral can be, and raise interest for this matter. If I succeeded (or not) or you want to add something, please tell me.

  • http://blogs.scienceforums.net/swansont/ Tom

    “Composed of the two most common elements in our planet’s crust (oxygen and silicone)”

    This should be silicon, not silicone.

  • http://beautifulwomenworlds.blogspot.com/ Eloy Galashaw

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  • http://EleonorOhta Myung Mansour

    I will be coming here again…Good blog.Love The most beautiful types of quartz [w/ pics] | ZME Science

  • ggggggg

    more amethyst

  • http://no suleiman

    i have agate but there is any precious side in it, and there is those line, what will i call it or should i send for Analysis?

    Thanks.
    +2348061123836

  • harish

    Its really so beautiful. its like a reality of imaginary things.

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  • Shadow72510

    hey i have a quartz crystal thats blue, what is it?

  • UNKNOWN

    why is there no quartz monzodiorite?

  • http://www.facebook.com/Havola Susan Harris

    Most likely it is one that has been treated.  I have several like that and they are beautiful.

  • Deyka1

    Really enjoyed the pics and educational text about quartz. I am a rock’s fan. 
    deyka

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  • Highlighting

    Amazing page! It helped my 9year old daughter do a big report on q
    Quartz!!!!!!!!!!!!!!!!!

  • Allie

    Awesome,awesome,awesome!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Sorry, the name highlighting was going to be hihihihihihi!

  • Gemlover

    This was the best page on quartz. I looked every where!!!! love the pics :)

  • ayunue kenneth

    i have large deposit of milky quartz . what can i do with it.it on about 8km