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A gemstone is a piece of mineral crystal which, in cut and polished form, is used to make jewelry or other adornments. However, certain rocks (such as lapis ...

Gemstones - Creetown Gem Rock Museum


What Makes A Mineral A Gemstone? g1. There are over two hundred recognised gemstones. Most are minerals and are cut from naturally occurring crystals.

A Guide to Gem Classification - International Gem Society


Precious and Semiprecious Gems; Diamonds and Colored Stones; Natural, ... Series and Blends; Mineral Groups and Gem Classification; Mineral Classes and Gem Classification .... If you look carefully at a sample, you'll see black, white, and gray bits all bound together. ... Each set makes up a different crystal system.

Mineral Value - The Mineral and Gemstone Kingdom


There are no exacting standards to determine the value of minerals. With experience, one can guess a mineral's price range by gathering certain information ...

Fluorescent Minerals and Rocks: They Glow under UV Light!


May 5, 2015 ... A small number of minerals and rocks will glow with spectacular ... The ultraviolet light activates these minerals and causes them to .... Gems from Space A number of materials from space have been used as attractive gems.

Garnet: a mineral, a gem, an abrasive, a filter and more! - Geology.com


Most people know garnet as a red gem, but it is a gem of many colors that is ... and pressure of metamorphism breaks chemical bonds and causes minerals to ...

Minerals, Gems Information, Facts, News, Photos -- National ...


Minerals are typically formed when molten rock, or magma, cools, or by ... cut and polished that they obtain the brilliance and luster that makes them so valued.

The Smithsonian Gem and Mineral Collection | Research & News


Nov 14, 2013 ... These words welcome visitors to the gem and mineral displays at the .... years in the future, a scientist can re-study a sample of the same specimen studied by ... This makes it the standard mineral collection for the international ...

Minerals and precious stones: Earth's jewels | Visual Dictionary


This family of minerals, called gems, groups together some 50 different semiprecious stones, including agate, opal, and jade, and four precious stones.

Quartz Mineral | Photos, Uses, Properties, Pictures - Geology.com


The uses and properties of the mineral Quartz with photos. ... A ubiquitous mineral with an enormous number of uses .... Quartz makes an excellent gemstone.

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Minerals, Rocks and Gems - GemSelect


Dec 21, 2007 ... What is the difference between a mineral, a rock and a gemstone? ... Since there is a science of minerals, called mineralogy, there needs to be a fairly precise definition of .... Great way to sample gems from around the world.

Streak: Mineral Properties - The Mineral and Gemstone Kingdom


Streak is the color of a crushed mineral's powder. The color of a mineral's powder may differ from the actual color of the mineral. This property can be useful for ...

Color: Mineral Properties - The Mineral and Gemstone Kingdom


Some minerals will always have a similar color, such as Gold, whereas some ... Two common examples are a Hematite coating Quartz, which causes the Quartz  ...