Whois & Analysis for anasilverco.com

Labradorite ((Ca, Na)(Al, Si)4O8), a feldspar mineral, is an intermediate to calcic member of the plagioclase series.

It has an anorthite percentage (%An) of between 50 and 70.

The specific gravity ranges from 2.68 to 2.72.

The streak is white, like most silicates.

The refractive index ranges from 1.559 to 1.573.

Twinning is common.

As with all plagioclase members, the crystal system is triclinic, and three directions of cleavage are present, two of which form nearly right angle prisms.

It occurs as clear, white to gray, blocky to lath shaped grains in common mafic igneous rocks such as basalt and gabbro, as well as in anorthosites.

Moonstone is a sodium potassium aluminium silicate, with the chemical formula (Na,K)AlSi3O8.

Etymology.

A gemstone (also called a gem, fine gem, jewel, precious stone or semi-precious stone) is a piece of mineral crystal which, in cut and polished form, is used to make jewelry or other adornments.

However, certain rocks (such as lapis lazuli) or organic materials that are not minerals (such as amber, jet, and pearl) are also used for jewelry and are therefore often considered to be gemstones as well.

Most gemstones are hard, but some soft minerals are used in jewelry because of their luster or other physical properties that have aesthetic value.

Rarity is another characteristic that lends value to a gemstone.

Apart from jewelry, from earliest antiquity engraved gems and hardstone carvings, such as cups, were major luxury art forms.

A gem maker is called a lapidary or gemcutter; a diamond worker is a diamantaire.

Larimar, also called "Stefilia's Stone", is a rare blue variety of the silicate mineral pectolite found only in the Dominican Republic, in the Caribbean.

Its coloration varies from white, light-blue, green-blue to deep blue.

Sterling silver is an alloy of silver containing 92.5 by weight of silver and 7.5 by weight of other metals, usually copper.

The sterling silver standard has a minimum millesimal fineness of 925.