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Garnet Specimen 2

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Original price $100
Current price $90

A nicely oriented Spessartine Garnet specimen.

Dimensions (length, width, height): 6.4cm x 5cm x 7.4cm

Weight: 280 grams

Origin: Skardu, Pakistan.

Color:  Green

 

Triangle shaped Garnet Specimen.



From Skardu.

Price $75

PERIDOT:

Peridot (sometimes called chrysolite) is gem-quality olivine and a silicate mineral with the formula of (Mg, Fe)2SiO4. As peridot is a magnesium-rich variety of olivine (forsterite), the formula approaches Mg2SiO4. Its green color is dependent on the iron contents within the structure of the gem. Peridot occurs in silica-deficient rocks such a volcanic basalt as well as in pallasitic meteorites. Peridot is one of only two gems observed to be formed not in the Earth’s crust, but in molten rock of the upper mantle. Gem-quality peridot is rare to find on Earth's surface due to its susceptibility to weathering during transportation from deep within the mantle to the surface.

In the Middle Ages, the gemstone was considered a stone that could provide healing powers, curing depression and opening the heart. Peridot is the birthstone for the month of August and the 16 year wedding anniversary gemstone.

Peridot is one of the few gemstones that occur in only one color: an olive-green. The intensity and tint of the green, however, depends on the percentage of iron in the crystal structure, so the color of individual peridot gems can vary from yellow, to olive, to brownish-green. In rare cases, peridot may have a medium-dark toned, pure green with no secondary yellow hue or brown mask

GENERAL

Category

Silicate mineral variety

Formula

(Mg, Fe)2SiO4

Crystal system

Orthorhombic

IDENTIFICATION

Color

Yellow, to yellow-green, olive-green, to brownish, sometimes a lime-green, to emerald-ish hue

Cleavage

Poor

Fracture

Conchoidal

Mohs scale hardness

6.5–7

Luster

vitreous (glassy)

Streak

None

Specific gravity

3.2–4.3

Refractive index

1.64–1.70

Birefringence

+0.036

Pleochroism

Weak

Melting point

Very high