Recommended Interesting Articles

Gemstones

Precious Opal and Play-of-Color

Author: Hobart M. King, Ph.D., GIA Graduate Gemologist Precious opal: Different types of opal that can be called "precious opal." Starting at top right and going clockwise: pinfire opal (named after its color pattern), white opal (named after its white background color), matrix opal (named after where the precious opal is located in the rock's structure), boulder opal (named after where the precious opal is located in the rock's structure), precious opal triplet (named because the stone is constructed in three pieces: a thin slice of precious opal, glued to a black non-opal base material, and covered with a clear protective cap of quartz), and black opal (named after its black background color).
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Maps

Tajikistan Map and Satellite Image

Tajikistan Bordering Countries: Afghanistan, China, Kyrgyzstan, Uzbekistan Regional Maps: Map of Asia, World Map Where is Tajikistan? Tajikistan Satellite Image Tajikistan Information: Tajikistan is located in central Asia. Tajikistan is bordered by Uzbekistan to the north and west, Kyrgyzstan to the north, China to the east, and Afghanistan to the south.
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Where to Find Gold In The Mother Lode

By James Klein Prospecting expert James Klein writes about finding gold in his favorite area, the Mother Lode region of California. From CA gold rush history to current times, this book will tell you where gold was, and can be, found in Mother Lode country. A 5.5" x 8.5" paperback with 179 pages. Where to Find Gold In The Mother Lode Table of Contents Introduction 1 History of the Gold Rush 3 Geology of the Mother Lode 13 Significant Events in the Mother Lode 19 Where to Find Gold 1.
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Rocks

Igneous and Volcanic Rock Features

When molten rock material cools, a wide variety of geologic features can form. Article by: Terri Cook, M.S. Although all igneous rocks form from the solidification of molten material, they can have very different appearances and characteristics depending upon the composition of the original material and where exactly it cooled.
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Metals

What is Manganese? How is it Used?

Adapted from USGS Fact Sheet 2014-3087, August 2014, by William F. Cannon. Manganese: Manganese has an atomic number of 25 and a chemical symbol of Mn. What is Manganese? Manganese is a silver metallic element with an atomic number of 25 and a chemical symbol of Mn. It is not found as an element in nature.
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Oil and Gas

Gifts That Rock Gifts That Rock - What are the most popular gift items in the store? What is LNG? What is LNG? The use of LNG as an energy source is growing rapidly. Learn more about LNG. Oil & Gas Rights Oil and Gas Rights Who owns the minerals under your land? Who wants to buy them? Royalty Calculator Natural Gas Royalty Calculator unoffical estimates of your annual royalty payments.
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