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Amethyst - Scientific Description

Amethyst - Scientific Description
Amethyst Overview
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Chemical Formula: SiO2
Composition: Silicon dioxide.
Color: From Light Purple to Dark Purple
Mohs Hardness: 7
Crystal Structure: Hexagonal  
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Amethyst is a purple colored variety of quartz and derives it color from impurities such as iron, aluminium or manganese. 
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Prasiolite is a green colored Amethyst.
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Citrine is yellow/orange color and is closely related to Amethyst.
Ametrine is a combination of Amethyst and Citrine and has a blending of both colors.
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Clear Quartz, Smoky Quartz and Rose Quartz are part of the same family as Amethyst.
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Amethyst is found in various locations around the world. Some of the most beautiful specimens of Amethyst are found in Brazil and Uruguay in South America.    
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Different types of Amethyst can be named in direct relation to where they are found or in relation to their chemical composition or special formations and inclusions.
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Below are a list of some of the different types of Amethyst.
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Amethyst Geode: A geode with Amethyst crystals forming on the inside. Usually with an agate ring forming towards the outer parts of the geode.
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Brandberg Amethyst: A unique combination of Amethyst, Smoky Quartz and Clear Quartz found in Namibia, Africa.
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Brazilian Amethyst: Amethyst from Brazil, South America. The most common yet one of the most beautiful and desired types.
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Chevron Amethyst: Amethyst and White Quartz combining in a banded pattern.
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Stalactite Amethyst: Amethyst that forms on the roof of a cave
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Uruguayan Amethyst: Amethyst from Uruguay, South America.
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Veracruz Amethyst: A more rare variety of Amethyst from Vera Cruz, Mexico.

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