Pyrope

The blood-red color of pyrope garnet is due to its iron and chromium content. It rarely has inclusions, but when present they are rounded crystals or have irregular outlines. As with all garnets, pyrope has no cleavage, and fracture is subconchoidal to uneven.

Pyrope garnet is found in volcanic rock and alluvial deposits, and may, along with certain other minerals, indicate the presence of diamond-bearing rocks. Localities include Arizona (USA), South Africa, Argentina, Australia, Brazil, Burma, Scotland, Switzerland, and Tanzania.

Pyrope comes from the Greek pyrops, meaning fiery. Swiss and South African pyropes are lighter red than stones from Bohemia, where pyrope jewelry has been made for over 500 years.

Perfectly transparent, clear, uniformly colored crystals of pyrope garnet were popular for jewellery in the 18th and 19th centuries.

Cause of Color :

Chromium, Iron

Chemical Composition :

Magnesium Aluminium Silicate – Mg3Al2(SiO4)3

Cuts & Uses :

Facetted, cabochon, beads, carvings, etc.

Dispersion : 0.027
Hardness : 7.25
Magnification :

Crystals and needles are present.

Refractive Index / Birefringence :

Pure: 1.714; Range: 1.720 – 1.740

Simulants (with separation tests) :

Rhodolite (R.I., S.G., spectrum), Red Spinel (spectrum, U.V. fluorescence, inclusions), Almandine Garnet (R.I., S.G., spectrum), Tourmaline (optic character, spectrum), Glass (spectrum, U.V. fluorescence, inclusions), Synthetic Cubic Zirconia (R.I., S.G., dispersion, lustre), etc.

Sources :

Bohemia, South Africa, U.S.A. (Arizona), Sri Lanka, Madagascar

Spectrum :
  • Iron rich: 575nm, 527nm, 505nm
  • Chrome rich: strong diagnostic band between 520nm and 620nm; doublet of moderate strength at 687nm and 685nm and weak lines at 671nm and 650nm.

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