Jewelry, Gems, & Minerals/Unknown mineral

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Question
Stone
Stone  
Found this necklace at a thrift store, I am wondering what the main center stone may be.  From the picture it is obviously tumbled and has a resinous to greasy luster.  The darker colored areas are in the stone and are rough to the touch.  I went to a gem shop and was told it was aqualite which it obviously isn't. Another dealer told me it was synthetic and popular as jewelry in the past, so I am certain it is real or synthetic and not plastic or resin. I also took a nail heated under a match as a test and the material did not melt.

Answer
It is always difficult to do this from a picture, but let me give you some ideas. Your stone has the resemblance of milky / cloudy amber, especially given the darker colored impurities. Maybe fake or real, but here are three most likely possibilities for your stone: Amber, Copal or Plastic.
Amber: Fossilized tree resin from prehistoric times dating as far back as 320 million years.
Copal: Hardened modern tree sap from the copal tree (Protium copal)

There are some tests you can do to check for real vs. fake amber, if this is indeed your stone. A very good selection of those tests can be found here:
http://www.rockhounds.com/rockshop/trueamber.shtml
Give some of these tests a try. They may help you identify your stone.

Jewelry, Gems, & Minerals

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Uwe Richard Kackstaetter, Ph.D. (Dr.K)

Expertise

I can answer questions concerning minerals, mineralogy, gems, metals, and anything that has to do with geology. However, I am NOT a jeweler. Questions about values, settings, gem stone cuts and appraisals are best directed to other experts on this site. I can however aide in the identification of unknown mineral materials. As a public service and part as training for new geoscientists, our university department provides FREE mineral identification for individuals. Please contact me for details or go to http://college.earthscienceeducation.net/MIN/MINID.pdf for details..

Experience

I am a professor of applied geology and mineralogy with many hours of field experience. Furthermore, I enjoy recreational gold prospecting and mineral collecting. As a professor I am engaged in research concerning minerals and their occurrence.

Organizations
Member of the GPAA (Gold Prospectors Association of America) as well as the Association of Environmental Geochemists. Member of the GSA (Geologic Society of America) Member of the AIPG (American Institute of Professional Geologists)

Publications
Here is a small sampling: Mineral-rock handbook: Rapid-easy mineral-rock determination : written for anyone interested in minerals and rocks - Proctor, Peterson, and Kackstaetter;Macmillan Pub. Co. (New York and Toronto and New York) Physical Geology Laboratory e-Manual [CD-ROM], Kackstaetter, Earth Science Education LLC Colorado Front Range Self-guided Geology Field Trips, Kackstaetter, http://www.scribd.com/doc/27175290/Colorado-Front-Range-Self-Guided-Geology-Field-Trips

Education/Credentials
Ph.D. in Applied Geology and Mineralogy. I am actively teaching courses in mineralogy and a variety of field courses with mineral collecting opportunities. Background in precious metal exploration.

Past/Present Clients
Numerous!

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