Quartz: the Series

The α- Alpha  and the β- Beta

The Science & Art of Quartz.

SiO2

Our most beloved gemstone, in its myriad forms…Eleven crystalline and 2 non-crystalline minerals comprise silica (SiO2), though Quartz is the most common form. In our landscapes, in our lives…
Twelve percent of Earth’s surface is quartz, and a full 20% of the whole crust is quartz.

 

Geologists have plotted the various forms of SiO2  over the years, culminating in the diagram to the left.

MySiOinterests these days, and most of my life actually, lie in the blue and pink  areas on the diagram:  α-quartz and β-quartz, respectively.

α-Alpha and β-beta quartz occur in all igneous, metamorphic and sedimentary rock types. Within the alpha and beta fields lie a seemingly vast array of different rock types, all of which comprise quartz.

Pectoral Necklace of Senworset II, Middle Kingdom, 1880 B.C.

 

Beautiful enough for gemstones. Revered since antiquity. The ancient Egyptians were gifted artisans whose use of blood-red Carnelian—one of the Quartz gemstones—is iconic and legendary.

It’s ALL Quartz…

Trace elements (e.g. iron) produce the colors we see in all forms of Quartz, though it is not color but size and  translucency that are the keys to the Classification of Quartz.

From Large to Small…Macro to Micro to Crypto. Size matters not only in how quartz gemstones are classified, but how they come to display the endless and gorgeous variation in color and patterns of spheres,  bands and layers–whether smooth or crenulated. And why we love these humble stones more than diamonds.

Today, it’s all about Macro. Following are a few examples of the flavors of Quartz whose crystals are large enough to see without magnification. Tomorrow, the small stuff.

Macrocrystalline: Crystals are easily identified without magnification.

These Amethyst crystals are an example of Macrocrystalline Quartz.

The crystals do not have to be whole, perfect and complete like these. Some Quartz is quite coarsely crystalline yet do not display the crystal habit of the mineral.

 

 

Rose Quartz is a type of Macrocrystalline Quartz that does not form crystal faces, but is composed of many intergrown crystal ‘sub-individuals’

Citrine

Second most popular Quartz gemstone…Amethyst is first.

 

 

 

Ametrine

A naturally occurring variety of Macrocrystalline Quartz comprising zones of Amethyst intergrown with zones of Citrine.

 

 

 

Ametrine cut perpendicular to the c-axis of the crystal. Is that freaking cool or what???

 

Quartz crystal axes: 

Macro…Micro…Crytpo…it’s ALL Quartz.
Versatile, beautiful, ornamental

Carnelian Pendant wrapped in Copper wire.
(and yes, Carnelian is one of the many lovely flavors of quartz, of the Microcrystalline Quartz variety)

Find this and more or my work with the Gifts of the Earth here:
https://etsy.me/2Mobjji

And my Facebook page MCS Artworks

Thank you…

Coming Soon: Microcrystalline Quartz

 

 

References:
Ametrine    https://www.mindat.org/min-7606.html
Ametrine    https://en.wikipedia.org/wiki/Ametrine
The Mineral Citrine    https://www.minerals.net/mineral/citrine.aspx
The Mineral Quartz   https://www.minerals.net/mineral/quartz.aspx
The Quartz Page     http://www.quartzpage.de/crs_intro.html

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