Amethyst Gemstone is the purple variety of the Quartz mineral. Amethyst’s purple color can range from a light lilac to a deep, intense royal purple, and from brownish to vivid.

Amethyst is a gem with purple coloring that many people find very beautiful. It is the purple variety of the mineral quartz. It was as valuable as ruby and emerald until the 1800s when more amethyst was …

Fine amethysts have been set in religious jewelry and royal crown jewels for ages. It was once considered equal in value to ruby, emerald, and sapphire.

Amethyst Description This amethyst crystal is from Namibia. It shows classic quartz crystal shape: a six-sided columnar crystal with a pyramid-shaped termination at the top. Courtesy Daniel Trinchillo, Fine …

Amethyst’s color quality ranges from extremely pale to intense or very dark. - ©GIA and Tino Hammid Any brownish or bronze-colored tints in an amethyst’s purple color, or any noticeable color zoning, …

Amethyst, the February birthstone, is the purple variety of quartz. It is said to prevent drunkenness and make you quick witted in business. You once had to be rich to own this birthstone for February, but …

May 8, 2017 · Amethyst is interpreted to have formed as the final stage of hydrothermal mineral deposition in the veins. Variable color, zoning, and crystal size in different but contiguous crystal …

Amethyst from Boudi, Morocco Fabrizio Troilo, Abdelghani El Harfi, Salahaddine Mouaddib, Erica Bittarello, and Emanuele Costa , 四月 30, 2015 阅读详细内容（英语） 摩洛哥紫水晶：采矿和营销 …

The most important commercial source of gem-quality amethyst in the United States is the Four Peaks mine in Maricopa County, Arizona (figure 1). Discovered by accident in the early 1900s by a gold …

モロッコ産アメシスト: 採鉱とマーケティング Andrew Lucas and Tao Hsu , 5 8, 2017 英語で詳細を読む Large Aqueous Primary Fluid Inclusion in Amethyst Ziyin Sun and Jonathan Muyal , 11 7, 2016 …