Iolite (original) (raw)

A variety of Cordierite

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Photos of Iolite (4)

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Iolite

Mogok Township, Pyin-Oo-Lwin District, Mandalay Region, Myanmar

Iolite

Gneiss quarry, Ebersdorf, Klein-Pöchlarn, Melk District, Lower Austria, Austria

Iolite

Babati, Babati District, Manyara Region, Tanzania

Iolite

Mogok Township, Pyin-Oo-Lwin District, Mandalay Region, Myanmar

Iolite

Gneiss quarry, Ebersdorf, Klein-Pöchlarn, Melk District, Lower Austria, Austria

Iolite

Babati, Babati District, Manyara Region, Tanzania

Iolite

Mogok Township, Pyin-Oo-Lwin District, Mandalay Region, Myanmar

Iolite

Gneiss quarry, Ebersdorf, Klein-Pöchlarn, Melk District, Lower Austria, Austria

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About IoliteHide

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Formula:

(Mg,Fe)2Al3(AlSi5O18)

Colour:

blue to blue–violet color

A variety of Cordierite

Name for gem-grade, violet-blue cordierite.

Visit gemdat.org for gemological information about Iolite.

Unique IdentifiersHide

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Mindat ID:

5119 (as Iolite)
1128 (as Cordierite)

Long-form identifier:

mindat:1:1:5119:0 (as Iolite)
mindat:1:1:1128:6 (as Cordierite)

GUID
(UUID V4):

16ef1534-e472-42f0-b2f6-ff3c9f696b1e (as Iolite)
a904bec8-4088-4c10-9192-e179c9778aef (as Cordierite)

Physical Properties of IoliteHide

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Colour:

blue to blue–violet color

Comment:

Cause of the color can be attributed to the charge transfer between Fe2+ on the octahedron and Fe3+ in the edge-shared T11 tetrahedra in the iolite. (1)The color coordinates a* and b* were the main factors affecting the variation of the chroma C*. (2)Fe is mainly present as Fe2+ and controls the lightness L* and the hue angle h°, while Mn does not have a significant effect on the color of iolite. (3)The intervalence charge transfer between Fe2+ and Fe3+ is responsible for the blue color of iolite. (4)The color parameters of iolite are affected by the change of light sources, and the hue angle h° is the most affected.

Chemistry of IoliteHide

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Mindat Formula:

(Mg,Fe)2Al3(AlSi5O18)

Elements listed:

Al, Fe, Mg, O, Si - search for minerals with similar chemistry

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Other InformationHide

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Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for IoliteHide

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mindat.org URL:

https://www.mindat.org/min-5119.html
Please feel free to link to this page.

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• Look for Iolite in the Rock H. Currier Digital Library

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References for IoliteHide

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Reference List:

Werner, A. G. (1807)

Liu, Xin, Guo, Ying (2022) Study on the Color-Influencing Factors of Blue Iolite. Minerals, 12 (11) 1356 doi:10.3390/min12111356

Localities for IoliteHide

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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.