New arrival of stones from June 25!

Contact us

Contact us

My Cabinet
List of buy

Pelikaanstraat 78

Office 509

Antwerpen 2018

Belgium

Almandine: description, properties and photo

Almandine

From this article you will know what kind of garnet stone is almandine, what are its main characteristics and properties, how does it look. Also we will provide a description and interesting facts about this gem. Almandine (or almandite) is a type of garnet mineral that is quite common and finds It is widely used in jewelry. Presumably, the meaning of the word “almandine” is associated with Alabanda city in Asia, the intersection of trade routes where these type of gemstones was cut.

Almandine

The color is within the shades of red, purple, sometimes brown and yellowish. Color is associated with the presence of iron and manganese. High transparency crystals are faceted. If the samples contain inclusions and cracks – they are used for making cabochons.

In faceted form almandines are stones of saturated violet-red color, often dark. Low grades are perceived as almost black, translucent or transparent, sometimes containing inclusions. The size is usually up to 5 carats. Stones larger than 15 carats are considered unique. How to choose a gem almandine can be found in the guide.

They are mined in only a few places on the planet if we talk about gem quality, despite the fact that the mineral itself is quite common. These are Brazil, some countries of Africa, Sri Lanka, China, and the USA. There is almandine also in Russia, for example, on the Kola peninsula.

Species containing almandine can be considered as decorative ornamental material. It’s interesting that sometimes the effect of asterism is observed in almandine: in large stones with cabochon form, with a point source of light, a 4 or 6-ray star is observed.

Almandine is a member of the isomorphic series of pyrope-spessartine, that is, it refers to pyralspite garnets by chemical composition. According to studies, the mineral is characterized by impurities Fe3 +, Ca2 +, Mn2 +.

Read more about the classification of garnet minerals here.

In its description almandine is also similar to another red garnets – pyrope and rhodolite. The characteristics of these varieties are very close. First of all, there are differences in chemical composition and density, as well as in optical properties: refractive index and dispersion.

DEPOSITS

Almandine from all varieties of garnet is the most common mineral. As for gem quality, there are few deposits of almandine. Main of them are: Brazil, Austria, China, Sri Lanka, Czech Republic. Also it’s found in Russia. In Ceylon, a gem is mined during the development of placers in Rantapura and near Kandy. Also, a small amount of gem-quality almandine enters the market from African countries: Tanzania (Umba river valley, Kalalani, Lindi deposits), Zimbabwe (Mtoko region), Madagascar. There is a mineral in India, the main deposits are located in Rajasthan, near Jaipur. The origin of the find does not affect the price of almandine.

Almandine Crystal

Properties

Mineral: almandine,

garnet group

Chemical formula:

Fe3Al2(SiO4)3

Crystal Systems:

cubic

Mohs scale hardness:

7.5

Optical character:

isotropic

Cleavage:

very imperfect

Density:

3.80-4.20 g / cm3

Lustre:

Vitreous to subadamantine

Refractive index:

1.76-1.81

Birefringence:

None

Dispersion:

0,024

Color:

reddish orange, orange red, purple red, brown red, red

Interesting facts

  • Star garnet is the emblem of the state of Idaho (USA), since the state has the Emerald Creek almandine deposit.
  • The largest almandine crystals found is about a meter in length and weighs about a ton. The find was made at the Norwegian Sunfjord deposit. The stone is opaque.
  • Almandine was mined from the beginning of the 18th century by the swedes in Russia, in the Ladoga area. They thought it’s a ruby.
Almandine Crystal

History

The history of the use of almandine in jewelry, along with other semiprecious red garnets, goes back to the medieval past. At that time, they still could not distinguish between varieties of red stones. There are many jewelry, carved cameos and intaglio from red garnet. Many are in museums and private collections. The history of production is associated with the development of deposits in Southeast Asia, from where in the Middle Ages there was a flow of gems that captured Europe.

Almandine deposits were discovered in some states during the settlement of North America. Today, almandine is a popular gemstone.

Enhancement

Almandine is not an object of treatment.

Almandine

Photo

red cushion almandine

In the photo: red cushion almandine

purple oval garnet

On the photo: purple garnet

large samples of gem almandine in wide color range

On the photo: large samples of gem almandine in wide color range

You have not viewed any product yet.

To top

Contact

    By clicking the "Send" button, you agree to the processing of personal data. We do not share data with third parties

    Find a similar

    Opal: description, properties and photo

      By clicking the "Send" button, you agree to the processing of personal data. We do not share data with third parties