Macle

Macle is a term used in crystallography. It is a crystalline form, twin-crystal or double crystal (such as chiastolite). It is crystallographic twin according to the spinel twin law and is seen in octahedral crystals or minerals such as diamond and spinel. The twin law name comes from the fact that is commonly observed in the mineral spinel. Macle is an old French word, a heraldic term for a voided lozenge (one diamond shape within another). Etymologically the word is derived from the Latin macula meaning spot, mesh, or hole.

You can help expand this article with text translated from the corresponding article in French. (June 2021) Click [show] for important translation instructions.

View a machine-translated version of the French article.
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Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article.
You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing French Wikipedia article at [[:fr:Macle (cristallographie)]]; see its history for attribution.
You may also add the template {{Translated|fr|Macle (cristallographie)}} to the talk page.
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This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. (April 2009)

Georges Friedel (1904) "Étude sur les groupements cristallins", Extrait du Bulletin de la Société de l'Industrie minérale, Quatrième série, Tomes III e IV. Saint-Étienne, Société de l’Imprimerie Théolier J. Thomas et C., 485 pp.
Georges Friedel (1920) "Contribution à l'étude géométrique des macles", Bulletin de la Société française de Minéralogie 43: 246-295.
Georges Friedel (1926) Leçons de Cristallographie, Berger-Levrault, Nancy, Paris, Strasbourg XIX+602 pp.
Georges Friedel (1933) "Sur un nouveau type de macles", Bulletin de la Société française de Minéralogie 56: 262-274.
J.D.H. Donnay (1940) "Width of Albite-Twinning Lamellae", Am. Mineral., 25: 578-586.

Macle on the French Wikipedia about "macle" in cristallography

You can help expand this article with text translated from the corresponding article in French. (June 2021) Click [show] for important translation instructions.

View a machine-translated version of the French article.
Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia.
Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article.
You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing French Wikipedia article at [[:fr:Macle (cristallographie)]]; see its history for attribution.
You may also add the template {{Translated|fr|Macle (cristallographie)}} to the talk page.
For more guidance, see Wikipedia:Translation.

This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. (April 2009)

Georges Friedel (1904) "Étude sur les groupements cristallins", Extrait du Bulletin de la Société de l'Industrie minérale, Quatrième série, Tomes III e IV. Saint-Étienne, Société de l’Imprimerie Théolier J. Thomas et C., 485 pp.
Georges Friedel (1920) "Contribution à l'étude géométrique des macles", Bulletin de la Société française de Minéralogie 43: 246-295.
Georges Friedel (1926) Leçons de Cristallographie, Berger-Levrault, Nancy, Paris, Strasbourg XIX+602 pp.
Georges Friedel (1933) "Sur un nouveau type de macles", Bulletin de la Société française de Minéralogie 56: 262-274.
J.D.H. Donnay (1940) "Width of Albite-Twinning Lamellae", Am. Mineral., 25: 578-586.

Macle on the French Wikipedia about "macle" in cristallography

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Bibliography

See also