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Amethyst Mineral Project

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Katelyn G.

on 13 November 2012

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Transcript of Amethyst Mineral Project

Amethyst Mineral Project By Katelyn Gojevic Chemical Formula and Group Color and Streak Hardness and Luster Important Uses and Geographic Location Cleavage and Fracture Resources Amethyst is a violet type of quartz. The color of an amethyst can range from a light pink to a deep purple color. The color in amethyst is caused when the mineral quartz has iron impurities or is exposed to radiation. An amethyst's color can also become faded if exposed to many light sources and can get dark in color when colored artificially. An amethyst's streak color is white. Some minerals have special properties that make them unique, such as taste, magnetism, and odor. The mineral amethyst is acidic and is fluoresent in ultra-violet light. Specific gravity is how dense a given object is or how dense an object is compared to another object. The specific gravity of a amethyst sample is 2.65 g\l. Transparency is how clear an object is. The transparency of amethyst is transparent to translucent, meaning you can see through it. Amethyst is a valuable mineral. It can be used to make necklaces, bracelets, and other types of jewelry. It can be made into ornaments, and used to engrave. Amethyst can be important to many religions. For example, in the Christian religion, it is considered the stone of the bishops, and can be used for ornaments for christianity. Amethyst can be found in places all over the world, but have large exports in countries like Southern Brazil, Uruguay, and Madagascar. Wikepedia.com
gemstoneeducation.com The mineral amethyst is a unique mineral. Amethyst is a mineral that is really a purple variety of the mineral quartz. This mineral has the chemical formula SiO2, and is a silicate, which is the most common rock-forming mineral group. This is an example of streak. The Mohs Scale is used to calculate a mineral's hardness, with number one being a soft mineral, and number ten being a hard mineral. A sample of amethyst on the Mohs Scale is a seven, which is really hard. An amethyst crystal can scratch the minerals talc and calcite, but cannot scratch the minerals diamond and topaz. Luster is the way in which a mineral reflects light. Amethyst reflects light and appears to look glossy, so it is classified with a glossy luster. It also has a non-metallic luster. The star shows the hardness of amethyst on the Mohs Scale. Amethyst has the same hardness as the mineral quartz. Cleavage is the tendency of a mineral to break along flat surfaces, while fracture is the tendency of a mineral to break into irregular pieces. Amethyst does not show any cleavage, but it does show fracture. An amethyst crystal has a conchoidal fracture, which means that it breaks in a curved way. This picture has irregular shaped pieces of amethyst that fracture. Special Properties, Specific Gravity, and Transparency On the left, the picture shows minerals under ultra-violet light. The picture in the middle demonstrates a way to test specific gravity. On the right, the amethyst shows transparency because you can see through it easily. Thanks for watching! I hope you learned a lot about amethysts! Light shines off of this piece of amethyst,so it has luster. This picture shows a mineral with cleavage. Pictures of Amethyst Crystals
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