It also forms from sodic metasomatism of metamorphic rocks. It s said by gem cutters that bytownite is an easy gemstone to cut and yields a brilliant stone. Bytownite gemstones by colour this table shows the variety of hues this gemstone can be found in. Bytownite is a calcium rich member of the plagioclase solid solution series of feldspar minerals with composition between anorthite and labradorite. These feldspars are rarely encountered in gem form.
Click on a photo for more information. Their occurrence is widespread throughout the world in a great variety of rock types and environments but in most cases transparent crystals are rare. Gemstone information bytownite 70 90 anorthite is the least common plagioclase. Typically in the pale yellow to light brown spectrum of color. Some other forms of feldspar especially the transparent yellow form of orthoclase are faceted and incorrectly labeled as bytownite.
Bytownite gemstones by size this table shows distribution of bytownite gemstone sizes that are listed on this site. It is one of rarest gemstones minerals belonging to the plagioclase feldspars family. It is usually translucent without a crystal form. Bytownite a variety of feldspar current inventory. The mineral bytownite bytownite is a rarer form of feldspar more commonly seen as a facet ed gemstone then as a collectors mineral.
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It is usually found as compact masses and grains in gabbros norites allivalites and anorthosites. 0 gems bytownite is named for bytown now ottawa canada where it was discovered. Click on a letter above to view the list of gems. Gem quality bytownite generally varies in color between pale yellow and light brown according to but other sources state that it is colourless grey wite or greenish grey. It is usually defined as having between 70 and 90 an formula.It is because composition and occurrence of bytownite is not very common and is hard to find. It is because composition and occurrence of bytownite is not very common and is hard to find. It is usually found as compact masses and grains in gabbros norites allivalites and anorthosites. Bytownite gemstones by size this table shows distribution of bytownite gemstone sizes that are listed on this site. Click on a photo for more information.
It is usually defined as having between 70 and 90 an formula. It also forms from sodic metasomatism of metamorphic rocks.
