Showing posts with label quartz. Show all posts
Showing posts with label quartz. Show all posts

Thursday, February 3, 2011

February's Special Birthstone - Amethyst

Amethyst is the stone of the Apostle St. Matthias, the Guardian Angel Adnachiel, and the beautiful birthstone of February. 


The amethyst is a violet extravagance. For many thousands of years, the amethyst has been the most striking representative of the large quartz family and a jewel coveted by princes both ecclesiastical and secular. Moses described it as a symbol of the Spirit of God in the official robes of the High Priest of the Jews, and the Russian Empress Catherine the Great sent thousands of miners into the Ural mountains to look for it. In ancient times, amethyst was already being engraved and cut into sculptured forms. In earlier times, people liked to drink wine from amethyst cups, which speaks of the stone's folklore of protection against alcoholism or drunkenness.

There was a time when amethyst was rare, but it has been found in many areas in recent years, and therefore, it's availability is no longer limited. This is the reason many of us remember when amethyst commanded much higher prices, and its expanded availability has enjoyably put it within reach of many more consumers. Deep clear amethysts may be easier to locate, but certainly they remain one of the most coveted gemstones, from mineral specimens to faceted gems to beads.

Tuesday, August 31, 2010

Lepidolite or "Flower Sugilite"

Semi-precious lepidolite is frequently known as flower sugilite. In reality, it isn't sugilite at all. Sugilite is a completely different stone, although it's also purple in its most desirable quality. Lepidolite's color is violet to pale pink or white and rarely gray or yellow. Its luster is vitreous to pearly and crystals are transparent to translucent. It is 2.5 on the Mohs hardness scale. Associated minerals are quartz, feldspars, and tourmaline.

Lepidolite is an uncommon mica and has only become available on the mineral market in sufficient quantities in the past decade. Lepidolite forms in granitic masses containing lithium. The typical violet to pink color of lepidolite is characteristic and is the only field test available to identify lepidolite from other micas.

Notable occurrences include Brazil, the Ural Mountains in Russia, several African localities and California in the U.S. Lepidolite belongs to the silicates class in the mica group. Its uses include ornamental stone, ore of lithium, and as a heat insulator in industry. A rock made of granular pink lepidolite and red to pink tourmaline is used as an ornamental stone for carving. Single large plates or "books" of lepidolite can have an appealing violet color and make attractive mineral specimens.