Tom Luxsox Coins

Morgan Gems

Prehnite Gemstones

Hundreds of minerals have been named after individuals, including a number of gemstones. The gemstones include Hiddenite (W.E. Hidden), Kunzite (George Frederic Kunz) and Morganite (J.P. Morgan).

But there is one gemstone that has the distinction of being the very first mineral ever named after an individual. The gemstone Prehnite was named for its discoverer, Colonel Hendrik von Prehn (1733-1785), a Dutch mineralogist and an early governor of the Cape of Good Hope colony. Prehnite was also the very first mineral to be named and described from South Africa, long before South Africa became an important source for precious gems.

Prehnite is a hydrated calcium aluminum silicate that occurs in a soft yellow-green to apple-green color. Many specimens have an intriguing luminous quality. It has a vitreous to mother-of-pearl luster. Prehnite is a medium-hard gem with a rating of 6 to 6.5 on the Mohs scale. Most prehnite is translucent but transparent specimens are sometimes found.

Prehnite is usually cut as cabochons or carved. Specimens displaying the cat's-eye effect are known but rare. Recently some green translucent to transparent material has been faceted, producing a new look for prehnite that has become popular for jewelry.

Prehnite gems can often by found in large sizes, sometimes as large as 100 carats. It is a relatively inexpensive gem, though higher quality faceted material may sell for prices approximately the same as amethyst or citrine. Generally the faceted material is found only in smaller sizes.

Until recently, prehnite was a rare gemstone, but new deposits have made it more available. While you are unlikely to find it in your local jewelry store, gemstone dealers often have some supply. Deposits are found in South Africa, Australia, China, Scotland and the United States.

Prehnite is said to encourages composure, forgiveness and acceptance and is excellent for meditation. Some people also believe that prehnite helps sufferers from claustrophobia.

 

About the Author

GemSelect is a leading online dealer in fine gemstones, specializing in sapphire, spinel, prehnite and tourmaline. Buy Fine Africa Gems at GemSelect.

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GPU Computing Gems Jade Edition $74.95 This is the second volume of Morgan Kaufmann's GPU Computing Gems , offering an all-new set of insights, ideas, and practical "hands-on" skills from researchers and developers worldwide. Each chapter gives you a window into the work being performed across a variety of application domains, and the opportunity to witness the impact of parallel GPU computing on the efficiency of scientific research. GPU Computing Gems: Jade Edition showcases the latest research solutions with GPGPU and CUDA, including: Improving memory access patterns for cellular automata using CUDA Large-scale gas turbine simulations on GPU clusters Identifying and mitigating credit risk using large-scale economic capital simulations GPU-powered MATLAB acceleration with Jacket Biologically-inspired machine vision An efficient CUDA algorithm for the maximum network flow problem 30 more chapters of innovative GPU computing ideas, written to be accessible to researchers from any industry GPU Computing Gems: Jade Edition contains 100% new material covering a variety of application domains: algorithms and data structures, engineering, interactive physics for games, computational finance, and programming tools. This second volume of GPU Computing Gems offers 100% new material of interest across industry, including finance, medicine, imaging, engineering, gaming, environmental science, green computing, and more Covers new tools and frameworks for productive GPU computing application development and offers immediate benefit to researchers developing improved programming environments for GPUs Even more hands-on, proven techniques demonstrating how general purpose GPU computing is changing scientific research Distills the best practices of the community of CUDA programmers; each chapter provides insights and ideas as well as 'hands on' skills applicable to a variety of fields

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GPU Computing Gems Emerald Edition $74.95 "...the perfect companion to Programming Massively Parallel Processors by Hwu & Kirk." -Nicolas Pinto, Research Scientist at Harvard & MIT, NVIDIA Fellow 2009-2010 Graphics processing units (GPUs) can do much more than render graphics. Scientists and researchers increasingly look to GPUs to improve the efficiency and performance of computationally-intensive experiments across a range of disciplines. GPU Computing Gems: Emerald Edition brings their techniques to you, showcasing GPU-based solutions including: Black hole simulations with CUDA GPU-accelerated computation and interactive display of molecular orbitals Temporal data mining for neuroscience GPU -based parallelization for fast circuit optimization Fast graph cuts for computer vision Real-time stereo on GPGPU using progressive multi-resolution adaptive windows GPU image demosaicing Tomographic image reconstruction from unordered lines with CUDA Medical image processing using GPU -accelerated ITK image filters 41 more chapters of innovative GPU computing ideas, written to be accessible to researchers from any domain GPU Computing Gems: Emerald Edition is the first volume in Morgan Kaufmann's Applications of GPU Computing Series , offering the latest insights and research in computer vision, electronic design automation, emerging data-intensive applications, life sciences, medical imaging, ray tracing and rendering, scientific simulation, signal and audio processing, statistical modeling, and video / image processing. Covers the breadth of industry from scientific simulation and electronic design automation to audio / video processing, medical imaging, computer vision, and more Many examples leverage NVIDIA's CUDA parallel computing architecture, the most widely-adopted massively parallel programming solution Offers insights and ideas as well as practical "hands-on" skills you can immediately put to use

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Zoo York Zye1018 Digital Mens Watch $85 In 1993, OG skateboarders Rodney Smith, Eli Morgan Gessner, and Adam Schatz teamed up to found the East Coast's first true skateboarding-inspired lifestyle brand - Zoo York. The trio siphoned creative inspiration from NYC's rapidly evolving skateboarding, hip-hop, and graffiti scenes to produce a variety of culturally relevant products that were dark and gritty like New York City. What started off as a simple line of decks and T-shirts steadily grew into a full-blown street wear collection marked by military surplus, urban-athletic styling that was designed to withstand the city's rugged terrain. Item Shape: Square Display Window Material Type: Mineral Case Material : Stainless Steel Case Color: Silver Dial Color: White Band Material: Stainless Steel Band Color: Silver Clasp: Fold Over Deployment Clasp Bezel Function: Stationary Bezel Color: Black Movement: Quartz Special Features: Stopwatch, Alarm, Timer, Auto-Calendar Water Resistant Depth: 3 ATM Band Color: Silver Metal, Band Width: 31mm near case, 21mm near clasp/buckle, Bezel Color: Silver, Case: Silver + Square-shaped, Case Finish: Satin + Stainless Steel, Case Thickness: 10mm, Case Width: 44mm; 45mm with crown, Clasp / Buckle: Fold Over Push Button Deployment, Dial: White + digital, Hand Color: Black, Movement: Other + quartz, Time Zones: Single, Water Resistance: 3 atm, Other Features: Stopwatch, Alarm, Timer, Calendar

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