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While other irradiated quartz stones return from the lab opaque black and need heating, Ganga Rosa turns strawberry red at 60 mrd, with medium to light intensity. The higher the radiation dosage, the darker the color. My experiments were limited to gamma radiation, using cobalt 60 and X-rays in the form of residual irradiation. During the X-ray testing, I noted that the material continued to darken. I placed crystals just outside of the direct beam cylinder at a linear accelerator laboratory.

Then, the material inside the cylinder received a dosage at 24 MEV of 5,000-10,000 mrd electrons. While I couldn’t gauge exactly what dosage the exterior area containing the quartz received, I estimate it at several thousand mrd at an accelerated dosage rate, at least. As the laboratory explained, this residual irradiation is X-ray (gamma) only. Undoubtedly, with higher dosage, we could reach a color intensity as dark as ruby. Note that, most likely, you can’t overdose this material. You can heat back all irradiated materials in stages on low temperature treatments. I observed another interesting effect with Ganga Rosa quartz with attached calcite (or more likely a calcite pseudomorph). With irradiation, this attached mineral goes black, as you would assume a quartz would do but not a calcite. This can create an interesting bicolor effect in some of the pieces.

Ganga Rosa is still producing these crystals today, and over the years has produced hundreds of kilos to tonnage. Although not a great production, this mine is reported to produce about 200 kilos per month. Faceting-quality material may reach 10-20 kilos per month. However, for the moment, only the collector’s market values them. Well-formed pieces of good rose color can get quite pricey, but those near colorless or damaged are almost valueless. At the time of this writing, a trip to Govenador Valadares would find the material readily available, sold by garimpeiros , small miners and agents of miners, in the gemstone trading street of Rua Picina, Centro. You would find they’re completely unaware of the treatment potential. Less adventurous individuals can simply visit their local gem and mineral shows. You may find dealers displaying this very same quartz, also unaware that it can be treated to red. The late Mark Liccini began his career as a stone carver in the 1970s and worked for many decades as a renowned lapidary. Mark mastered the art of gemology, gaining degrees from the Gemmological Association of Great Britain and the Columbia School of Gemology. Imtec has set the global standard for both static and recirculating heated quartz baths. Our complete line of Accubath systems deliver unsurpassed process performance, reliability, and safety in wet systems throughout the world. Our commitment to engineering excellence has consistently given Imtec’s customers exceptionally dependable and advanced process equipment. The Accubath combines the highest quality materials and engineering designs to create a quartz bath that enhances your process. Our quartz tanks are suitable for use in processes using quartz-compatible chemistries up to 190°C. Quartz is known for its durability and non-reactivity to a variety of chemistries. We employ experienced quartz welders and machinists to create high purity, uniform tanks in a variety of standard and custom sizes, with the ability to add high-strength welded quartz inlets and probe holders. For the most rigorous processes, we offer our patented AquaSeal technology, which protects against the leading cause of vessel failure. It incorporates a dual sealing feature by directing DI water to flow over the RTV seal area, cooling it while forming a barrier against chemical fumes. Please see our material compatibility chart to find out which material works best for your process. High Operating Temperatures – Operates up to 190° and can be used with any quartz compatible chemistries. Flexibility – Variety of standard and custom sizes available. Multiple drain configurations and a complete line of accessories allow for easy integration. Small Footprint – Vertically built saving approximately 3 inches of wet-system linear deck space per vessel. High Particle Removal Efficiency – Raised 360° weir with scalloped 45° knife edge rim pulls particles over the weir edge.

Better Performance – Sump designed to reduce low liquid level heater problems and to prevent recirculating pump air ingestion. Longer Life – AquaSeal high-strength welded quartz inlet and outlet ports, and raised weir design ensures superior vessel life.

Handle unscrews and inserts into the base, which is where you place the tobacco. The mouthpiece is the horizontal part of the handle.


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