Iolite Description - GIA
Iolite falls at 7 to 7.5 on the Mohs hardness scale, but given that it has distinct cleavage in one direction, its toughness is only fair. This makes iolite vulnerable to breakage when set in a ring or other setting exposed to rough daily wear. Unlike tanzanite, iolite is rarely treated.
Iolite Gemstone | Iolite Stone – GIA
1982年6月1日 · Facts. Mineral: Iolite (Cordierite) Chemical composition: Mg 2 Al 4 Si 5 O 18. Color: Violetish blue (pleochroic colorless-yellow) Refractive index: 1.542 - 1.551. Birefringence: +0.045, -0.011. Specific gravity: 2.61. Mohs hardness: 7.0 – 7.5. Treatments.
Iolite Care and Cleaning - GIA
Iolite rates 7 to 7.5 on the Mohs hardness scale. Because it has perfect cleavage in one direction, iolite requires special care during cutting, polishing, and mounting. It’s not very tough, so a hard blow might split it, and extreme pressure or sharp temperature changes might cause it to break.
Iolite Gemstone Information - Facts & Benefits - GemSelect
Iolite gemstone exhibits a stunning blue to violet color and has a transparent to translucent appearance. It has a strong pleochroism, displaying different colors when viewed from different angles. It is also known for its strong durability and is rated 7-7.5 on the Mohs scale of hardness.
Iolite: Gem-quality cordierite and blue sapphire look-alike. - Geology.com
Iolite is a challenging material to facet because of its extreme pleochroism. The cutter must examine the stone carefully and have its axis of top-quality color oriented perpendicular to the plane of the gem's table.
Cordierite - Wikipedia
Cordierite (mineralogy) or iolite (gemology) is a magnesium iron aluminium cyclosilicate. Iron is almost always present, and a solid solution exists between Mg-rich cordierite and Fe-rich sekaninaite with a series formula: (Mg, Fe)2 Al 3(Si 5Al O 18) to (Fe,Mg)2Al3(Si5AlO18). [3] .
Iolite (Water Sapphire) : Properties, Formation, Localities » …
2024年7月1日 · Hardness: On the Mohs scale of mineral hardness, iolite scores around 7 to 7.5, making it durable enough for use in jewelry but not as hard as some other gemstones like diamonds or sapphires. Cleavage: Iolite has good cleavage in one direction, meaning it can be split along specific planes when subjected to stress.
Iolite or Cordierite : Properties, Formation, Uses » Gemstone
2024年7月1日 · Hardness: Iolite has a hardness of 7 to 7.5 on the Mohs scale, making it moderately hard. This makes it suitable for various jewelry applications but also means it can be scratched by harder materials.
Iolite Gem Guide and Properties Chart - Gemstones.com
This Iolite gemstone guide lists qualities of the Iolite gem type, including stone colors, common names, meanings, gemstone hardness and more.
Iolite - The Gemology Project
2008年4月4日 · Diagnostics. Iolite may be confused (due to its color) with sapphire and tanzanite. Color. Iolite is usually blue to violetish-blue. Rarely it is colorless. Magnification. Iolite is a type II stone in the GIA clarity grading system is usually included. Typical inclusions are: liquid feathers. hexagonal platelets of biotite, hematite or pyrrothite.