Bytownite
Mexico
5.63 carats
© Rarestone.com
Bytownite 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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Bytownite Gemstones by Size
This table shows distribution of Bytownite 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:0.21 cts
Heaviest:7.08 cts
Average:2.40 cts
Total photos:24
Do you have a larger Bytownite? Why not upload a photo?
| General Information | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| A variety or type of: | Feldspar | ||||||||||
| Chemical Formula |
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| Photos of natural/un-cut material from mindat.org | |||||||||||
| Physical Properties of Bytownite | |||||||||||
| Mohs Hardness | 6 to 6.5, Blue Chart Gem Identification (2010) More from other references | ||||||||||
| Specific Gravity | 2.72 to 2.75, Blue Chart Gem Identification (2010) More from other references | ||||||||||
| Tenacity | Brittle, Gems, Sixth Edition (2006) | ||||||||||
| Cleavage Quality | Perfect, Gemmological Tables (2004) More from other references | ||||||||||
| Fracture | Uneven,Conchoidal, Gems, Sixth Edition (2006) | ||||||||||
| Optical Properties of Bytownite | |||||||||||
| Refractive Index | 1.561 to 1.583, Blue Chart Gem Identification (2010) More from other references | ||||||||||
| Optical Character | Biaxial/-, Blue Chart Gem Identification (2010) More from other references | ||||||||||
| Birefringence | 0.007 to 0.011, Blue Chart Gem Identification (2010) More from other references | ||||||||||
| Dispersion | Low (0.012), Gems, Sixth Edition (2006) | ||||||||||
| Colour | |||||||||||
| Colour (General) | Yellowish, reddish-brown, labradorescent, Gemmological Tables (2004) More from other references | ||||||||||
| Transparency | Transparent,Translucent, Gemmological Tables (2004) More from other references | ||||||||||
| Lustre | Vitreous,Dull (Earthy), Gems, Sixth Edition (2006) Vitreous to dull | ||||||||||
| Crystallography of Bytownite | |||||||||||
| Crystal System | Triclinic, Blue Chart Gem Identification (2010) More from other references | ||||||||||
| Geological Environment | |||||||||||
| Where found: | It is usually found as compact masses and grains in gabbros, norites, allivalites and anorthosites. It also forms from sodic metasomatism of metamorphic rocks. Often it occurs as part of compositionally zoned feldspars., Gems, Sixth Edition (2006) | ||||||||||
| Further Information | |||||||||||
| Mineral information: | Bytownite information at mindat.org | ||||||||||