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by Dale "Cougar" Armstrong, Wire-Sculpture.com

Daily Wire Jewelry Making Tip for
March 23, 2012

Today's Gem Profile is...

Included Quartz Part 2, one in a Series on Quartz

Shop Quartz Cabochons | Shop Rutilated Quartz Beads, Tourmalinated Quartz Beads

Tourmalated quartz, or tourmalinated quartz, is what we call quartz that has included tourmaline crystals. Although found naturally in a wide variety of colors (a future gem profile subject) the tourmaline crystals most often suspended in quartz are in shades of green or opaque black (aka schorl). Sometimes forming in radial fans and often singular, elongated tourmaline crystals have 6 sides (like a pencil) and can be included in several different rocks. Also known as Green Hair Quartz, Fleches d’Amour (Love Arrows) or Cupid’s Darts, water clear quartz with included tourmaline crystals is often faceted or cut into a variety of shapes and makes awesome jewelry designs. Please be aware that the stone prehnite can be confused with tourmalated quartz.

cut tourmalated quartz

A collection of faceted tourmalated quartz, one set into a wire pendant by Dale Cougar Armstrong.

tourmalinated quartz wire wrapped ring by Kim Burns

Kim Burns wire wrapped this approximately 14ct, 13mmx19mm Tourmalated Quartz stone with Argentium Silver wire, using Dale's Prong Ring DVD!

A very cool type of included quartz is called "Medusa" quartz, named for resembling the shape of the medusas rondeau jellyfish. Trapped blobs of gilalite (named for Gila County, Arizona) seem to float in the water clear quartz as seen in these Google images.

dendritic quartz cabochon wire wrapped by Gina Smith

A dendritic quartz cabochon wrapped by Gina Smith in sterling silver. Gina says, "A customer asked me to wrap this for her to go with a black and white Paisley design dress. She also asked that it be done so she could hang it in a fan shape as pictured or by either end. So, the loops or bails are hidden behind the stone. She loved it!"

Have you seen clear quartz that looks as though a snowflake, branch or leaf has been suspended inside? This type of included quartz is known as dendritic quartz. No, the images within the quartz aren’t fossils, rather they are dendrite (meaning tree) crystal forms of either chlorite or iron oxides. Instead of trying to rewrite what has already been well written, for those of you who are interested in learning more about dendrites I suggest reading the following pdf download: How Do Dendrites Form?

dendritic quartz stones, with inclusions like tree branches

Examples of faceted quartz with dendrite inclusions, known as dendritic quartz. Private collection, Dale Armstrong.

Probably my personal favorite type of included quartz for jewelry design is what can be called Garden, Undersea Reef, Scenic, Monet, Lodolite, Lodalite or Dream Stone quartz. Once again, I was fortunate to have purchased quite a bit of this material many years ago, before it really "had" a name and became such a popular jewelry making item!

wire wrapped garden quartz pendant by Dale Cougar Armstrong

I prefer to call my pieces "Monet" quartz, as the images resemble his impressionist paintings; one of which I wired into a pendant.

The latest label for this exotically included quartz, lodolite/lodalite, translates into "stone from mud" because the quartz crystals often formed in clay/mud pockets. While the silica/quartz was forming, an additional mineral became involved. These heavier materials of cookeite/chlorite settled to the bottom of the quartz formation in colors including white, beige, yellow, orange, green, light blue, light brown and light pink. Sometimes the chlorite minerals settled down and formed their known crystal shapes of rosettes, balls and radiating spheres, and sometimes the deposit became frozen during formation, appearing as clouds. (I do need to mention that occasionally the green can appear mossy, but included macrocrystalline quartz should not be confused with cryptocrystalline moss agate, that will be covered in my future cryptocrystalline articles in this quartz series.) Other materials within lodolite quartz include iron and calcite. Note though, when this quartz contains mainly bright orange iron oxides mixed with cream and white calcite, it can be labeled "Leolite." Whatever you decide to call it, in my opinion, chlorite included quartz is fabulous!

Cut garden quartz stones in Dale's collection

More examples of chlorite and calcite included "Garden" quartz. Private collection, Dale Armstrong.

Chlorite included quartz in Dale's collection

Natural quartz crystals from Brazil, with chlorite inclusions and clouds.

Okay, now what do you suppose happens when a quartz crystal stopped growing and another mineral crystallized on top of it, coating the original crystal with thousands of tiny colored crystals; and then additional silica entered the same vug/cavity and another quartz crystal form grew over the entire combination? Appearing as one or more ghost-like crystals within a single specimen, these are called phantoms. Otherworldly and rare, phantom crystals can be composed of a wide variety of materials including: sand, clay, chlorite, actinolite and mica or iron materials such as goethite and hematite. One other way that a phantom may have occurred could be due to temperature changes during the crystal’s formation, where severe temperature changes interfered with the original growth for a bit (like a few thousand or millions of years) and when it restabilized the crystal continued to grow in its normal manner. Phantoms are most often found in rock crystal, occasionally in amethyst or smoky quartz. Although some lapidaries will cut and polish huge phantom specimens into items like crystal balls, eggs and spheres, most examples are smaller and will make fine pendants using a wire technique such as the Caged Crystal, which will not harm the specimen in any way.

phantom crystals, or water quartz crystals, in Dale's collection

A few of the water quartz crystals in my personal collection, showing a variety of phantoms.

 tibetan crystal quartz in Dale's collection

This unusual specimen comes from Tibet. Notice not only the exotic crystal scepter growth, but also the clay inclusions within the bottom crystal.

Believe it or not, almost all quartz crystals have liquid or “enhydro” inclusions. The most common is water, which appears as microscopic bubbles causing clouds or a milky look. Of course I would love to have a specimen in my collection, showing a large liquid inclusion as a bubble with fluid that moved when the rock was turned, however…it is on my wish list.

quartz with inclusions necklace by Jackie Morris

Jackie Morris created this necklace and earring set with included-quartz beads and sterling silver wire.

Yes, geologically speaking there are many other items that can be found included in macrocrystalline quartz, however it is my opinion that they are not pertinent to making wire jewelry, so this concludes inclusions. Next week I will finish the macrocrystalline quartz subject, after which we will move on to those items in the cryptocrystalline quartz category.

Resources

Print Resources:

  • Mineralogical Record, vol. 24, no.4. pp 311-313. "Solid Inclusions". W.A. Henderson Jr. & M.H. Weber (1993)
  • The Peterson Field Guide to Rocks and Minerals by Frederick H. Pough, ISBN 0-395-24049-2
  • Simon & Schuster’s Guide to Gems and Precious Stones by Curzio Cipriani and Alessandro Borelli, ISBN 0-671-60430-9

Internet Resources:

Gem Profile by Dale "Cougar" Armstrong

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