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Amethyst is the purple variety of the mineral quartz, and is its most famous and valuable gem variety. Quartz also contains other gemstones such as citrine, rose quartz, and smoky quartz. The color of …

Citrine is the yellow to orange variety of quartz. Natural citrine is not common; Most citrine on the gem market is produced by heat treating amethyst and smoky quartz. It takes a relatively low … Malachite is a popular mineral with its intense green color and beautiful banded masses. The banded specimens are formed by massive, botryoidal, reniform, and especially stalactitic malachite that are … Amethyst is a well known mineral and gemstone.

Malachite is a popular mineral with its intense green color and beautiful banded masses. The banded specimens are formed by massive, botryoidal, reniform, and especially stalactitic malachite that are … Amethyst is a well known mineral and gemstone. It is the purple variety of the mineral quartz, and its most valuable and prized variety. Its name derives from the greek amethystos, which means not … The mineral and gemstone kingdom: Minerals directory advertising information Amethyst amethyst, the purple variety, is the most popular and valuable quartz gemstone. Amethyst ranges from light to dark purple. See the amethyst gemstone page for more details. Citrine citrine is … Although amethyst, the purple variety of quartz, and citrine, the yellow/orange variety of quartz belong to the same scientific mineral classification, they have always been distinguished as individual …

The mineral and gemstone kingdom: Minerals directory advertising information Amethyst amethyst, the purple variety, is the most popular and valuable quartz gemstone. Amethyst ranges from light to dark purple. See the amethyst gemstone page for more details. Citrine citrine is … Although amethyst, the purple variety of quartz, and citrine, the yellow/orange variety of quartz belong to the same scientific mineral classification, they have always been distinguished as individual … Complete index of minerals varieties and other names. Detailed description, properties, and locality information guide about the mineral corundum: Ruby and sapphire.

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See the amethyst gemstone page for more details. Citrine citrine is … Although amethyst, the purple variety of quartz, and citrine, the yellow/orange variety of quartz belong to the same scientific mineral classification, they have always been distinguished as individual … Complete index of minerals varieties and other names. Detailed description, properties, and locality information guide about the mineral corundum: Ruby and sapphire.

Detailed description, properties, and locality information guide about the mineral corundum: Ruby and sapphire.