Euclase
Pear Euclase
5.78 carats
© Rarestone.com
Flawless gem rough above 1 gram is very rare. It is usually colourless, sapphire blue or blue-green. Most appreciated are bright, blue sapphire-like stones.
Euclase Gemstones by Colour
This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
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Euclase Gemstones by Size
This table shows distribution of Euclase gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:1.25 cts
Heaviest:9.68 cts
Average:4.85 cts
Total photos:7
Do you have a larger Euclase? Why not upload a photo?
| General Information | ||||||||||||||||||||||||||||
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| Chemical Formula |
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| Euclase Treatments | ||||||||||||||||||||||||||||
| Blue and green may be produced by irradiation of colorless stones - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 4 | ||||||||||||||||||||||||||||
| Physical Properties of Euclase | ||||||||||||||||||||||||||||
| Mohs Hardness | 7.5, Blue Chart Gem Identification (2010) More from other references | |||||||||||||||||||||||||||
| Specific Gravity | 3.08 to 3.12, Blue Chart Gem Identification (2010) More from other references | |||||||||||||||||||||||||||
| Tenacity | Brittle, Gemstones of the world (2001) | |||||||||||||||||||||||||||
| Cleavage Quality | Perfect, Blue Chart Gem Identification (2010) 1 perfect and easy cleavageMore from other references | |||||||||||||||||||||||||||
| Fracture | Conchoidal, Gemstones of the world (2001) | |||||||||||||||||||||||||||
| Optical Properties of Euclase | ||||||||||||||||||||||||||||
| Refractive Index | 1.650 to 1.677, Blue Chart Gem Identification (2010) More from other references | |||||||||||||||||||||||||||
| Optical Character | Biaxial/+, Blue Chart Gem Identification (2010) More from other references | |||||||||||||||||||||||||||
| Birefringence | 0.019 to 0.025, Blue Chart Gem Identification (2010) More from other references | |||||||||||||||||||||||||||
| Pleochroism | Weak: colorless-(greenish) - yellow-green - blue-green, Blue Chart Gem Identification (2010) | |||||||||||||||||||||||||||
| Dispersion | 0.016, Gemstones (2009) | |||||||||||||||||||||||||||
| Colour | ||||||||||||||||||||||||||||
| Colour (General) | Colourless, greenish, bluish, greenish-blue, blue, Gemmological Tables (2004) More from other references | |||||||||||||||||||||||||||
| Colour (Chelsea Filter) | Blue variety often shows red, Blue Chart Gem Identification (2010) | |||||||||||||||||||||||||||
| Causes of Colour | Blue Fe2+-O-Fe3+ charge transfer. Green Cr3+ in octahedral coordination, Pragmatic Spectroscopy For Gemologists (2011) | |||||||||||||||||||||||||||
| Transparency | Transparent, Gemmological Tables (2004) More from other references | |||||||||||||||||||||||||||
| Lustre | Vitreous, Gemstones (2009) | |||||||||||||||||||||||||||
| Fluorescence & other light emissions | ||||||||||||||||||||||||||||
| Fluorescence (General) | Weak or none, Gemstones of the world (2001) | |||||||||||||||||||||||||||
| Crystallography of Euclase | ||||||||||||||||||||||||||||
| Crystal System | Monoclinic, Blue Chart Gem Identification (2010) More from other references | |||||||||||||||||||||||||||
| Habit | Flattened prismatic, Gems, Sixth Edition (2006) More from other references | |||||||||||||||||||||||||||
| Geological Environment | ||||||||||||||||||||||||||||
| Where found: | Euclase is found in pegmatites and is formed from the decomposition of beryl., Gems, Sixth Edition (2006) | |||||||||||||||||||||||||||
| Further Information | ||||||||||||||||||||||||||||
| Mineral information: | Euclase information at mindat.org | |||||||||||||||||||||||||||
| Significant Gem Localities | ||||||||||||||||||||||||||||
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