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Titanite - Sphene

A quit rare gemstone, Titanite or Spene as it earlier was known as. The picture does no do it justice, because the Titanite changes colour due to the angle of light. Its very nice mounted in some jewellry though.

 

Size: 5,04x5,05x3,26 mm

Clarity: VS2

Origin: Russia, Earth mined

In stock:  1-2

 

Price:  USD 12.30 a piece

Titanite, also know under the former name Sphene (from the greek sphenos (σφηνώ), which means wedge) is a cacium titanium nesocilicate mineral. Trace impurities of iron and aluminium are typically present. Also commonly present are rare earth metals including cerium and yttrium. In 1982, the International Mineralogical Association Commission on New Minerals and Mineral Names (CNMMN) adopted the name titanite and 'discredited' the name sphene, although Sphene persists as the informal name for titanite gemstones. Titanite, which is named for its titanium content, occurs as translucent to transparent, reddish brown, gray, yellow, green, or red monoclinic crystals. It has a hardness of 5.5 and a weak cleavage. Transparent specimens are noted for their strong trichroism, the three colours presented being dependent on body colour. Owing to the quenching effect of iron, sphene exhibits no fluorescence under ultraviolet light.

Titanite occurs as a common accessory mineral in intermediate and felsic igneous rocks and associated pegmatites. It also occurs in metamorphic rocks such as gneiss and schists and skarns. Source localities include: Pakistan; Italy; Russia; China; Brazil;Switzerland Madagascar; Austria; Canada, and in a number of locations in the USA. As a gemstone, titanite is usually some shade of chartreuse, but can be brown or black. Jewellry use of titanite is limited, both because the stone is uncommon in gem quality and is relatively soft.

 

CLARITY CLASSIFICATION
IF Internally Flawless No Inclusions Visible Even With 10x Magnification.
VVS Very-Very Slightly Included Minute Inclusions Not Visible To Eye.
VSI Very Slight Inclusions Slight Inclusions Visible To Eye.
SI 1-2 Slight Inclusions: Some Inclusions Visible.
I 1-3 Included Many Inclusions Visible. 807163324

 

 

 

 

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Latest update: 28 augusti 2015